subject:(wideband)

Anna University

1. Shagar, A C. Design and analysis of CPW FED slot antennas for wideband applications; -.

Degree: Information and Communication Engineering, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/24521

►

In 2002 the Federal Communications Commission of the United State officially released the regulation for Ultra wideband technology In this regulation, the spectrum from 3… (more)

Subjects/Keywords: Information and communication engineering; Ultra-wideband; Wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shagar, A. C. (2014). Design and analysis of CPW FED slot antennas for wideband applications; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/24521

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shagar, A C. “Design and analysis of CPW FED slot antennas for wideband applications; -.” 2014. Thesis, Anna University. Accessed January 17, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/24521.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shagar, A C. “Design and analysis of CPW FED slot antennas for wideband applications; -.” 2014. Web. 17 Jan 2021.

Vancouver:

Shagar AC. Design and analysis of CPW FED slot antennas for wideband applications; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 17]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/24521.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shagar AC. Design and analysis of CPW FED slot antennas for wideband applications; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/24521

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Southern California

2. Yang, Jeffrey Ming-Jer. Analysis and design of wideband array antennas.

Degree: PhD, Electrical Engineering, 2012, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/429683/rec/801

► An array antenna consists of a group of radiating elements forming a single aperture to transmit and receive electromagnetic energy. This work focuses on the… (more)

▼ An array antenna consists of a group of radiating elements forming a single aperture to transmit and receive electromagnetic energy. This work focuses on the analysis, development, and design of array antennas geared towards operation over wide frequency bandwidths. As a consequence of the present effort, both the geometry and the operation theory of a louver array antenna are developed, and their use in wide-band antenna arrays investigated.; This dissertation begins by first establishing the electromagnetic boundary condition associated with the radiating aperture of an antenna array made of identical cells. Then, it proceeds to impose this condition on Maxwell's equations to yield the array radiated field as an infinite plane wave spectrum.; To properly investigate the energy transfer efficiency of an array, from circuit to free space, the Poynting theorem is used to determine the power balance equation of the antenna. From this analysis, an aperture reflection coefficient is defined and introduced as a convenient figure-of-merit to gauge the effectiveness of the antenna as an energy transducer. For demonstration purposes, this aperture reflection coefficient is then applied to study the characteristics of the frequently used rectangular microstrip patch array. It is shown that the patch array geometry is prone to excite evanescent fields (i.e., store reactive energy) in its aperture region, causing it to require a highly reactive, and therefore narrow band, matching network behind each element to ensure proper operation. In contrast, the louver array primarily excites a dominant mode field that exactly emulates the desired radiated plane wave, with nearly no evanescent field generation. Since a band-limiting matching structure is not required (to compensate evanescent fields), the louver antenna is inherently wideband. In addition to this fact, the louver antenna is amenable to be integrated directly with semiconductor electronics. This feature allows the future implementation of a densely populated array antenna with fractional wavelength element spacing to enable broad band, wide angle, grating-lobe-free beam scan.; Even though no experimental work was performed for this research, a systematic array design and analysis procedure is presented at the end of this dissertation. To demonstrate their application, a louver array antenna is then designed for a 30-to-1 operation frequency band. As a preliminary validation, this louver array is then modeled using an established commercial finite-element numerical analysis software. Both the analytically and the numerically predicted array performances obtained show close agreement. This validates the design and analysis procedures presented, as well as demonstrate their applicability for implementing high efficiency, wideband, wide scan angle array antennas. Advisors/Committee Members: Prata, Aluizio (Committee Chair), Steier, William H. (Committee Member), Scholtz, Robert A. (Committee Member), Pilch, Krzysztof (Committee Member).

Subjects/Keywords: wideband; array; antenna

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yang, J. M. (2012). Analysis and design of wideband array antennas. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/429683/rec/801

Chicago Manual of Style (16^th Edition):

Yang, Jeffrey Ming-Jer. “Analysis and design of wideband array antennas.” 2012. Doctoral Dissertation, University of Southern California. Accessed January 17, 2021. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/429683/rec/801.

MLA Handbook (7^th Edition):

Yang, Jeffrey Ming-Jer. “Analysis and design of wideband array antennas.” 2012. Web. 17 Jan 2021.

Vancouver:

Yang JM. Analysis and design of wideband array antennas. [Internet] [Doctoral dissertation]. University of Southern California; 2012. [cited 2021 Jan 17]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/429683/rec/801.

Council of Science Editors:

Yang JM. Analysis and design of wideband array antennas. [Doctoral Dissertation]. University of Southern California; 2012. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/429683/rec/801

Oregon State University

3. Hu, Changhui. Energy-efficient, short-range ultra-wideband radio transceivers.

Degree: PhD, Electrical and Computer Engineering, 2011, Oregon State University

URL: http://hdl.handle.net/1957/20651

► Short-range wireless communications continually attract interest from both industry and academia, and it is changing our life in every aspect in the last decade. The… (more)

Subjects/Keywords: Ultra-wideband; Broadband communication systems

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hu, C. (2011). Energy-efficient, short-range ultra-wideband radio transceivers. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/20651

Chicago Manual of Style (16^th Edition):

Hu, Changhui. “Energy-efficient, short-range ultra-wideband radio transceivers.” 2011. Doctoral Dissertation, Oregon State University. Accessed January 17, 2021. http://hdl.handle.net/1957/20651.

MLA Handbook (7^th Edition):

Hu, Changhui. “Energy-efficient, short-range ultra-wideband radio transceivers.” 2011. Web. 17 Jan 2021.

Vancouver:

Hu C. Energy-efficient, short-range ultra-wideband radio transceivers. [Internet] [Doctoral dissertation]. Oregon State University; 2011. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1957/20651.

Council of Science Editors:

Hu C. Energy-efficient, short-range ultra-wideband radio transceivers. [Doctoral Dissertation]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/20651

4. Silva, Mário Marques da. Emergent Radio Systems.

Degree: 2005, Instituto Superior Técnico

URL: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ual.pt:11144/350

► Emergent services are demanding higher data rates, especially in the downlink. Wideband Code Division Multiple Access (WCDMA) is the key to reach this development in… (more)

Subjects/Keywords: Wideband; Communications

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Silva, M. M. d. (2005). Emergent Radio Systems. (Thesis). Instituto Superior Técnico. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ual.pt:11144/350

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Silva, Mário Marques da. “Emergent Radio Systems.” 2005. Thesis, Instituto Superior Técnico. Accessed January 17, 2021. http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ual.pt:11144/350.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Silva, Mário Marques da. “Emergent Radio Systems.” 2005. Web. 17 Jan 2021.

Vancouver:

Silva MMd. Emergent Radio Systems. [Internet] [Thesis]. Instituto Superior Técnico; 2005. [cited 2021 Jan 17]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ual.pt:11144/350.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silva MMd. Emergent Radio Systems. [Thesis]. Instituto Superior Técnico; 2005. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ual.pt:11144/350

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

5. Malarkkan, S. Studies on performance improvement of call admission control with mobility estimation models and parameters measurement in wcdma systems; -.

Degree: Information and Communication Engineering, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/26881

►

The rapid expansion of the mobile market over the past few years newlinehas seen cellular communications move away from just voice to a host of… (more)

Subjects/Keywords: Wideband Code Division Multiple Access

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Malarkkan, S. (2014). Studies on performance improvement of call admission control with mobility estimation models and parameters measurement in wcdma systems; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26881

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Malarkkan, S. “Studies on performance improvement of call admission control with mobility estimation models and parameters measurement in wcdma systems; -.” 2014. Thesis, Anna University. Accessed January 17, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/26881.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Malarkkan, S. “Studies on performance improvement of call admission control with mobility estimation models and parameters measurement in wcdma systems; -.” 2014. Web. 17 Jan 2021.

Vancouver:

Malarkkan S. Studies on performance improvement of call admission control with mobility estimation models and parameters measurement in wcdma systems; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 17]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26881.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Malarkkan S. Studies on performance improvement of call admission control with mobility estimation models and parameters measurement in wcdma systems; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26881

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

6. Adsul, Alpana. Design and performance evaluation of transmitted reference Ultra Wideband Receiver.

Degree: Information and Technology, 2013, INFLIBNET

URL: http://shodhganga.inflibnet.ac.in/handle/10603/9039

►

Wireless communication is one of the fast evolving areas in communication ﬁeld today. It is one of the most important technologies in modern society. Ultra… (more)

Subjects/Keywords: Transmitted Reference Ultra Wideband Receiver

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adsul, A. (2013). Design and performance evaluation of transmitted reference Ultra Wideband Receiver. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/9039

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Adsul, Alpana. “Design and performance evaluation of transmitted reference Ultra Wideband Receiver.” 2013. Thesis, INFLIBNET. Accessed January 17, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/9039.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Adsul, Alpana. “Design and performance evaluation of transmitted reference Ultra Wideband Receiver.” 2013. Web. 17 Jan 2021.

Vancouver:

Adsul A. Design and performance evaluation of transmitted reference Ultra Wideband Receiver. [Internet] [Thesis]. INFLIBNET; 2013. [cited 2021 Jan 17]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9039.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Adsul A. Design and performance evaluation of transmitted reference Ultra Wideband Receiver. [Thesis]. INFLIBNET; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9039

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

7. Silva, Mário Marques da. Emergent Radio Systems.

Degree: 2005, Instituto Superior Técnico

URL: http://www.rcaap.pt/detail.jsp?id=oai:localhost:11144/350

► Emergent services are demanding higher data rates, especially in the downlink. Wideband Code Division Multiple Access (WCDMA) is the key to reach this development in… (more)

Subjects/Keywords: Wideband; Communications

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Silva, M. M. d. (2005). Emergent Radio Systems. (Thesis). Instituto Superior Técnico. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:localhost:11144/350

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Silva, Mário Marques da. “Emergent Radio Systems.” 2005. Thesis, Instituto Superior Técnico. Accessed January 17, 2021. http://www.rcaap.pt/detail.jsp?id=oai:localhost:11144/350.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Silva, Mário Marques da. “Emergent Radio Systems.” 2005. Web. 17 Jan 2021.

Vancouver:

Silva MMd. Emergent Radio Systems. [Internet] [Thesis]. Instituto Superior Técnico; 2005. [cited 2021 Jan 17]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:localhost:11144/350.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silva MMd. Emergent Radio Systems. [Thesis]. Instituto Superior Técnico; 2005. Available from: http://www.rcaap.pt/detail.jsp?id=oai:localhost:11144/350

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

8. Redfield, Stephen J. Understanding the ultra-wideband channel within a computer chassis.

Degree: MS, Electrical and Computer Engineering, 2010, Oregon State University

URL: http://hdl.handle.net/1957/16473

► Recent developments in computing technology have generated a demand for more streamlined and effective test systems. By replacing traditional in-chassis wired interconnects with a broadcast… (more)

Subjects/Keywords: Ultra-wideband; Wireless communication systems

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Redfield, S. J. (2010). Understanding the ultra-wideband channel within a computer chassis. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/16473

Chicago Manual of Style (16^th Edition):

Redfield, Stephen J. “Understanding the ultra-wideband channel within a computer chassis.” 2010. Masters Thesis, Oregon State University. Accessed January 17, 2021. http://hdl.handle.net/1957/16473.

MLA Handbook (7^th Edition):

Redfield, Stephen J. “Understanding the ultra-wideband channel within a computer chassis.” 2010. Web. 17 Jan 2021.

Vancouver:

Redfield SJ. Understanding the ultra-wideband channel within a computer chassis. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1957/16473.

Council of Science Editors:

Redfield SJ. Understanding the ultra-wideband channel within a computer chassis. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/16473

University of Manitoba

9. Rezazadeh, Navid. Design and Study of a New Ultra-wideband Pattern Diversity Antenna, for High-Gain Application.

Degree: Electrical and Computer Engineering, 2014, University of Manitoba

URL: http://hdl.handle.net/1993/23936

► A new Ultra-Wideband (UWB) pattern diversity antenna is proposed, designed and investigated in this thesis. The antenna is capable of radiating in directive and omni-directional… (more)

▼ A new Ultra-Wideband (UWB) pattern diversity antenna is proposed, designed and investigated in this thesis. The antenna is capable of radiating in directive and omni-directional modes. Three different versions of the design are studied to show the performance for different applications. The first design consists of a single radiating element fed from two sides by coaxial probes over a shaped ground plane. In-phase excitation of the ports produces omni-directional radiation patterns and out-of-phase excitation results in directive radiation in the boresight of the antenna. The shape of the radiator is a disk, which is modified in geometry to improve the isolation of the ports. The antenna shows impedance bandwidth from 6.8 GHz to more than 15 GHz. The second design is a dual-element version of the same antenna to equalize the radiation patterns in the E- and H-planes. The antenna requires four ports and has an impedance bandwidth from 7.4 GHz to more than 15 GHz. A microstrip power divider is then included, in the third design, which in addition to decreasing the number of extra circuits for feeding, decreases the lower frequency to 4.5 GHz, without changing the radiation patterns significantly throughout the bandwidth. A prototype of this antenna was fabricated and measured, and the results are presented. In the fifth chapter, an electromagnetic polarization filter is designed for the single element UWB antenna, to reduce the cross-polarization level. 7 dB reduction in the maximum level of cross-polarization is achieved, throughout the frequency band 8 - 11 GHz. The following chapter is dedicated to the study and performance of the microstrip-fed UWB antenna, when used as a feed for prime-focus reflectors. It is shown that the designed antenna is capable of feeding the reflector with efficiency as high as 75%, and more than 60%, over a wide bandwidth of 5.5 - 9 GHz. Advisors/Committee Members: Shafai, Lot (Electrical and Computer Engineering) (supervisor), Mojabi, Puyan (Electrical and Computer Engineering) Osborn, Thomas (Physics and Astronomy) (examiningcommittee).

Subjects/Keywords: Ultra-wideband; Antenna; Pattern Diversity

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rezazadeh, N. (2014). Design and Study of a New Ultra-wideband Pattern Diversity Antenna, for High-Gain Application. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/23936

Chicago Manual of Style (16^th Edition):

Rezazadeh, Navid. “Design and Study of a New Ultra-wideband Pattern Diversity Antenna, for High-Gain Application.” 2014. Masters Thesis, University of Manitoba. Accessed January 17, 2021. http://hdl.handle.net/1993/23936.

MLA Handbook (7^th Edition):

Rezazadeh, Navid. “Design and Study of a New Ultra-wideband Pattern Diversity Antenna, for High-Gain Application.” 2014. Web. 17 Jan 2021.

Vancouver:

Rezazadeh N. Design and Study of a New Ultra-wideband Pattern Diversity Antenna, for High-Gain Application. [Internet] [Masters thesis]. University of Manitoba; 2014. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1993/23936.

Council of Science Editors:

Rezazadeh N. Design and Study of a New Ultra-wideband Pattern Diversity Antenna, for High-Gain Application. [Masters Thesis]. University of Manitoba; 2014. Available from: http://hdl.handle.net/1993/23936

Rice University

10. El Smaili, Sami. Efficient Architectures for Wideband Receivers.

Degree: MS, Engineering, 2012, Rice University

URL: http://hdl.handle.net/1911/77324

► Reducing power consumption of radio receivers is becoming more critical with the advancement of biomedical portable and implantable devices due to the stringent power requirements… (more)

Subjects/Keywords: Wideband receiver; Compressive sensing

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

El Smaili, S. (2012). Efficient Architectures for Wideband Receivers. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/77324

Chicago Manual of Style (16^th Edition):

El Smaili, Sami. “Efficient Architectures for Wideband Receivers.” 2012. Masters Thesis, Rice University. Accessed January 17, 2021. http://hdl.handle.net/1911/77324.

MLA Handbook (7^th Edition):

El Smaili, Sami. “Efficient Architectures for Wideband Receivers.” 2012. Web. 17 Jan 2021.

Vancouver:

El Smaili S. Efficient Architectures for Wideband Receivers. [Internet] [Masters thesis]. Rice University; 2012. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1911/77324.

Council of Science Editors:

El Smaili S. Efficient Architectures for Wideband Receivers. [Masters Thesis]. Rice University; 2012. Available from: http://hdl.handle.net/1911/77324

Delft University of Technology

11. He, J. (author). Wideband High Power Doherty Amplifiers.

Degree: 2013, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:419401bd-08dc-49bb-8855-13ae7d18e0d7

►

Currently the Doherty Power Amplifier (DPA) is replacing the traditional Class B amplifier in base-station and broadcast applications, as such becoming the preferred choice of… (more)

▼

Currently the Doherty Power Amplifier (DPA) is replacing the traditional Class B amplifier in base-station and broadcast applications, as such becoming the preferred choice of industry due to its simplicity and high efficiency performance. In spite of its success, so far practical DPA implementations can provide only a very limited RF bandwidth, which tends to narrow down even more at higher power levels. This narrowband behavior of the DPA is mostly caused by the use of traditional operating classes for the active devices and bandwidth restrictions related to use of a conventional impedance inverter. In this work, the bandwidth of different DPA topologies has been analyzed, followed by a discussion of recent techniques that can help to improve the DPA bandwidth. To overcome the remaining bandwidth limitations in a DPA design, a novel differential configuration was proposed. In this approach, transmission line based baluns are used to implement the desired wideband 2nd harmonic terminations of the active devices. By combining this technique with a novel wideband impedance inverter, excellent DPA wideband performance can be achieved. Unfortunately, when going to practical balun implementations, various imperfections come to light, which trouble the achievable DPA bandwidth performance. For this reason, three practical balun structures are investigated in detail, namely, the coaxial cable based balun, the vertically installed planar balun and suspended planar stripline balun. To explore the proposed DPA concept when using practical baluns, two DPAs featuring mixed-signal driven inputs are presented. A dedicated design procedure for these DPAs is also given. The first prototype is implemented using NXP GaN devices and coaxial cable based baluns. Simulation results show a maximum output power of 52dBm, but in 6dB power back-off we only reach 40% efficiency from 530MHz to 700MHz, which is significantly less than the intend bandwidth (450MHz-810MHz). Using the lessons learned of this first amplifier, a second design with NXP LDMOS devices and suspended planar stripline balun has been developed. According to simulation this later design provides a maximum output power of 59dBm with the efficiency above 55% at both full power and 6dB power back-off. According the simulations this second design can even achieve 50% efficiency at 8dB back-off. The related center frequency is 650MHz with a high-efficiency bandwidth at 6dB power back-off (efficiency within 10% of its maximum) from 460MHz to 790MHz.

Microwave group

Microelectronics & Computer Engineering

Electrical Engineering, Mathematics and Computer Science

Advisors/Committee Members: De Vreede, L.C.N. (mentor), Qureshi, J. (mentor), Calvillo-Cortés, D.A. (mentor).

Subjects/Keywords: Doherty power amplifier; Balun; Wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

He, J. (. (2013). Wideband High Power Doherty Amplifiers. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:419401bd-08dc-49bb-8855-13ae7d18e0d7

Chicago Manual of Style (16^th Edition):

He, J (author). “Wideband High Power Doherty Amplifiers.” 2013. Masters Thesis, Delft University of Technology. Accessed January 17, 2021. http://resolver.tudelft.nl/uuid:419401bd-08dc-49bb-8855-13ae7d18e0d7.

MLA Handbook (7^th Edition):

He, J (author). “Wideband High Power Doherty Amplifiers.” 2013. Web. 17 Jan 2021.

Vancouver:

He J(. Wideband High Power Doherty Amplifiers. [Internet] [Masters thesis]. Delft University of Technology; 2013. [cited 2021 Jan 17]. Available from: http://resolver.tudelft.nl/uuid:419401bd-08dc-49bb-8855-13ae7d18e0d7.

Council of Science Editors:

He J(. Wideband High Power Doherty Amplifiers. [Masters Thesis]. Delft University of Technology; 2013. Available from: http://resolver.tudelft.nl/uuid:419401bd-08dc-49bb-8855-13ae7d18e0d7

Delft University of Technology

12. Li, J. (author). Wideband High Power Amplifier Design.

Degree: 2011, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:fdf758f2-ea47-44a5-b384-806464750dee

►

This thesis aims for high power wideband amplifiers suitable for base station instrumentation purposes. A power combing topology is introduced, not only to achieve high… (more)

Subjects/Keywords: power amplifier; high power; wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, J. (. (2011). Wideband High Power Amplifier Design. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:fdf758f2-ea47-44a5-b384-806464750dee

Chicago Manual of Style (16^th Edition):

Li, J (author). “Wideband High Power Amplifier Design.” 2011. Masters Thesis, Delft University of Technology. Accessed January 17, 2021. http://resolver.tudelft.nl/uuid:fdf758f2-ea47-44a5-b384-806464750dee.

MLA Handbook (7^th Edition):

Li, J (author). “Wideband High Power Amplifier Design.” 2011. Web. 17 Jan 2021.

Vancouver:

Li J(. Wideband High Power Amplifier Design. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Jan 17]. Available from: http://resolver.tudelft.nl/uuid:fdf758f2-ea47-44a5-b384-806464750dee.

Council of Science Editors:

Li J(. Wideband High Power Amplifier Design. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:fdf758f2-ea47-44a5-b384-806464750dee

Tampereen ammattikorkeakoulu

13. Heinisuo, Jaakko. Ultra Wideband -tekniikan ominaisuudet ja mahdollisuudet.

Degree: 2015, Tampereen ammattikorkeakoulu

URL: http://www.theseus.fi/handle/10024/103536

►

Tämän opinnäytetyön tarkoituksena oli perehtyä Ultra Wideband -tekniikkaan ja sen tulevaisuuteen ja mahdollisuuksiin. Ultra Wideband eli UWB on langaton tiedonsiirtotekniikka, jonka vahvuuksiin kuuluvat erittäin korkea… (more)

▼

Tämän opinnäytetyön tarkoituksena oli perehtyä Ultra Wideband -tekniikkaan ja sen tulevaisuuteen ja mahdollisuuksiin. Ultra Wideband eli UWB on langaton tiedonsiirtotekniikka, jonka vahvuuksiin kuuluvat erittäin korkea tiedonsiirtonopeus lyhyillä etäisyyksillä ja pieni energiankulutus. UWB toimii WPAN-verkossa ja se soveltuu erinomaisesti kodin elektroniikan yhdistämiseen langattomasti ja langattoman multimedian siirtoon kuin myös tarkkaan sisätilan paikannukseen. UWB-tekniikka käyttää perinteisiin langattomiin tiedonsiirtotekniikoihin verrattuna erittäin laajaa radiotaajuusaluetta pienellä lähetysteholla. Ultra Wideband -signaali on muiden laitteiden näkökulmasta pelkkää kohinaa, joten tämän vuoksi sitä voidaan käyttää samoilla taajuusalueilla kuin muita tekniikoita. UWB-tekniikan suurin haaste on standardien puute. Mikäli yhteiset säännöt tekniikasta ja taajuuksien jaosta saataisiin aikaan, olisi sille lukemattomia sovellusmahdollisuuksia. Aluksi työssä käydään lyhyesti läpi UWB:n historiaa. Tämän jälkeen siirrytään itse tekniikkaan, jonka lomassa tuodaan ilmi tekniikan vahvuuksia ja haasteita verrattuna muihin langattomiin tiedonsiirtotekniikoihin. Ensimmäiseksi luodaan katsaus UWB:n ominaisuuksiin ja vahvuuksiin yleisesti ja tämän jälkeen siirrytään signaalin määrittelyyn sekä taajuusjako- ja tehotasorajoituksiin. Seuraavaksi käsitellään tekniikan toimintaperiaatteita, toteutusta ja antennin vaatimuksia. Lopuksi pohditaan vielä UWB-tekniikan sovelluskohteita, mahdollisuuksia ja tulevaisuutta.

The purpose of this thesis was to explore Ultra Wideband technology and its future and possibilities. Ultra Wideband, also known as UWB, is a wireless radio technology of which advantages are a very high data transfer rate at short range and small power consumption. UWB operates in wireless personal area network (WPAN) and it is exceptional in connecting consumer electronics and in transferring multimedia. It can also be used as an indoor alternative to Global Positioning System (GPS). Unlike conventional radio technologies, which operate within a relatively narrow bandwidth, the UWB operates across a wide range of the frequency spectrum using low transmit power. Because of the low power it is said that UWB signal is hiding in the noise floor of the spectrum and hence not interfering with the traditional radio systems that operate on the same spectrum. The biggest challenge for Ultra Wideband technology is the absence of standards. If global rules were achieved, UWB would have countless application possibilities. At the beginning the work describes briefly the history of Ultra Wideband. After that the technology itself is explored with its advantages and challenges compared to conventional radio technologies. First there is an overview of the features of the UWB followed by signal specifications, radio frequency spectrum limitations and power restrictions. Next the theory of operation, implementation and antenna requirements are covered. Finally thesis takes a look at the applications, possibilities…

Advisors/Committee Members: Tampereen ammattikorkeakoulu.

Subjects/Keywords: uwb; ultra wideband; wpan

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Heinisuo, J. (2015). Ultra Wideband -tekniikan ominaisuudet ja mahdollisuudet. (Thesis). Tampereen ammattikorkeakoulu. Retrieved from http://www.theseus.fi/handle/10024/103536

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Heinisuo, Jaakko. “Ultra Wideband -tekniikan ominaisuudet ja mahdollisuudet.” 2015. Thesis, Tampereen ammattikorkeakoulu. Accessed January 17, 2021. http://www.theseus.fi/handle/10024/103536.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Heinisuo, Jaakko. “Ultra Wideband -tekniikan ominaisuudet ja mahdollisuudet.” 2015. Web. 17 Jan 2021.

Vancouver:

Heinisuo J. Ultra Wideband -tekniikan ominaisuudet ja mahdollisuudet. [Internet] [Thesis]. Tampereen ammattikorkeakoulu; 2015. [cited 2021 Jan 17]. Available from: http://www.theseus.fi/handle/10024/103536.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Heinisuo J. Ultra Wideband -tekniikan ominaisuudet ja mahdollisuudet. [Thesis]. Tampereen ammattikorkeakoulu; 2015. Available from: http://www.theseus.fi/handle/10024/103536

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Texas

14. Raavi, Srinivasa. Design of a Wideband Class J Power Amplifier.

Degree: 2013, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc271882/

► A conventional RF power amplifier will convert the low powered radio frequency signals into high powered signals. Along with the expected ability to increase the… (more)

Subjects/Keywords: Power amplifier; wideband; class J

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Raavi, . S. (2013). Design of a Wideband Class J Power Amplifier. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc271882/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Raavi, Srinivasa. “Design of a Wideband Class J Power Amplifier.” 2013. Thesis, University of North Texas. Accessed January 17, 2021. https://digital.library.unt.edu/ark:/67531/metadc271882/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Raavi, Srinivasa. “Design of a Wideband Class J Power Amplifier.” 2013. Web. 17 Jan 2021.

Vancouver:

Raavi S. Design of a Wideband Class J Power Amplifier. [Internet] [Thesis]. University of North Texas; 2013. [cited 2021 Jan 17]. Available from: https://digital.library.unt.edu/ark:/67531/metadc271882/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Raavi S. Design of a Wideband Class J Power Amplifier. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc271882/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Limerick

15. Zeng, Liaoyuan. Spectrum efficiency maximization in multiband OFDM ultra wideband cognitive radio systems.

Degree: 2011, University of Limerick

URL: http://hdl.handle.net/10344/3651

►

peer-reviewed

UltraWideband is a high-speed, short-range and low-power wireless technology. UWB system is overlapped with wireless systems such as WLAN, WiMax and UMTS, which limits… (more)

▼

peer-reviewed

UltraWideband is a high-speed, short-range and low-power wireless technology. UWB system is overlapped with wireless systems such as WLAN, WiMax and UMTS, which limits the use of UWB. Cognitive radio technology enables the UWB system to efficiently use the overlapped spectrum without causing interference to other wireless systems. The thesis focuses on the design of the cognitive radio resource allocation algorithms for spectrum efficiency maximization in the multiband OFDM UWB system. The spectrum efficiency of a cognitive UWB system depends on the cognitive algorithms used in spectrum sensing, spectrum sharing and spectrum management. The spectrum efficiency maximization problem is formulated to a multi-dimensional knapsack problem with constraints in the transmit power of the UWB subcarriers, the average bit error rate and the interference to the primary users. New cognitive algorithms for spectrum sensing and spectrum management are developed to solve the optimization problem. The proposed low-complexity cognitive algorithms include: primary and advanced power allocation algorithm, group power allocation algorithm and spectrum sensing time optimization algorithm. In a cognitive UWB system, the primary and advanced power allocation algorithm as well as the group power allocation algorithm are used for spectrum management, while spectrum sensing time optimization algorithm is used for spectrum sensing. The spectrum sensing time optimization algorithm computes the optimal spectrum sensing period which maximizes the cognitive UWB system’s data transmission period while guaranteeing a target probability of detection/false-alarm. During the data transmission period, the primary and advanced power allocation algorithm achieves the optimal spectrum efficiency by equally allocating the transmit power and distributing the excessively allocated power to the subcarriers in a greedy manner. Also, the group power allocation algorithm can obtain the optimal spectrum efficiency by adaptively assigning the transmit power to the subcarrier groups according to the effective signal-to-noise ratio of each subcarrier group whose bandwidth is less than the coherence bandwidth of the UWB channel. For energy-limited cognitive UWB system, the proposed cognitive algorithms maximize the spectrum efficiency with lower order-of-growth than the traditional dynamic radio resource allocation algorithms.

Advisors/Committee Members: McGrath, Sean, Cano, Eduardo, IRCSET, Wireless Access Centre.

Subjects/Keywords: ultra wideband; UWB system

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zeng, L. (2011). Spectrum efficiency maximization in multiband OFDM ultra wideband cognitive radio systems. (Thesis). University of Limerick. Retrieved from http://hdl.handle.net/10344/3651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zeng, Liaoyuan. “Spectrum efficiency maximization in multiband OFDM ultra wideband cognitive radio systems.” 2011. Thesis, University of Limerick. Accessed January 17, 2021. http://hdl.handle.net/10344/3651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zeng, Liaoyuan. “Spectrum efficiency maximization in multiband OFDM ultra wideband cognitive radio systems.” 2011. Web. 17 Jan 2021.

Vancouver:

Zeng L. Spectrum efficiency maximization in multiband OFDM ultra wideband cognitive radio systems. [Internet] [Thesis]. University of Limerick; 2011. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10344/3651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zeng L. Spectrum efficiency maximization in multiband OFDM ultra wideband cognitive radio systems. [Thesis]. University of Limerick; 2011. Available from: http://hdl.handle.net/10344/3651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

York University

16. Park, Kunwoo. Ultra-Wideband Based UAV Positioning in GNSS Denied Environment.

Degree: MSc -MS, Earth & Space Science, 2020, York University

URL: http://hdl.handle.net/10315/37760

► GNSS-IMU-based navigation has been introduced in the mid-90s and still a key component of UAV navigation. However, it has a critical drawback to operate in… (more)

Subjects/Keywords: Engineering; UAV; Positioning; Ultra-Wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Park, K. (2020). Ultra-Wideband Based UAV Positioning in GNSS Denied Environment. (Masters Thesis). York University. Retrieved from http://hdl.handle.net/10315/37760

Chicago Manual of Style (16^th Edition):

Park, Kunwoo. “Ultra-Wideband Based UAV Positioning in GNSS Denied Environment.” 2020. Masters Thesis, York University. Accessed January 17, 2021. http://hdl.handle.net/10315/37760.

MLA Handbook (7^th Edition):

Park, Kunwoo. “Ultra-Wideband Based UAV Positioning in GNSS Denied Environment.” 2020. Web. 17 Jan 2021.

Vancouver:

Park K. Ultra-Wideband Based UAV Positioning in GNSS Denied Environment. [Internet] [Masters thesis]. York University; 2020. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10315/37760.

Council of Science Editors:

Park K. Ultra-Wideband Based UAV Positioning in GNSS Denied Environment. [Masters Thesis]. York University; 2020. Available from: http://hdl.handle.net/10315/37760

The Ohio State University

17. Johnson, Alexander D. A Wideband Tightly Coupled Dipole Array with Novel Differential Feeding Network.

Degree: MS, Electrical and Computer Engineering, 2017, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1510665098390604

► Differential RF front-end components provide greater immunity to ground noise and distortion by suppressing external interference. Recent advancements in differential RF front-end components offer high… (more)

Subjects/Keywords: Electrical Engineering; Antenna; Differential; Wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Johnson, A. D. (2017). A Wideband Tightly Coupled Dipole Array with Novel Differential Feeding Network. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1510665098390604

Chicago Manual of Style (16^th Edition):

Johnson, Alexander D. “A Wideband Tightly Coupled Dipole Array with Novel Differential Feeding Network.” 2017. Masters Thesis, The Ohio State University. Accessed January 17, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1510665098390604.

MLA Handbook (7^th Edition):

Johnson, Alexander D. “A Wideband Tightly Coupled Dipole Array with Novel Differential Feeding Network.” 2017. Web. 17 Jan 2021.

Vancouver:

Johnson AD. A Wideband Tightly Coupled Dipole Array with Novel Differential Feeding Network. [Internet] [Masters thesis]. The Ohio State University; 2017. [cited 2021 Jan 17]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1510665098390604.

Council of Science Editors:

Johnson AD. A Wideband Tightly Coupled Dipole Array with Novel Differential Feeding Network. [Masters Thesis]. The Ohio State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1510665098390604

18. Pagazani, Julien. Transposeurs intégrés ultra large bande continûment accordable de 1 à 20 GHz, utilisant les technologie de silicium micro-usiné dans un perspective de consommation ultra faible (quelques mW) : Ultra wideband transposer integrated continuously tunable from 1-20 GHz, using the technology of silicon micro-machined in a perspective of extremely low power consumption (few mW).

Degree: Docteur es, Electronique, Optronique et Systèmes, 2012, Université Paris-Est

URL: http://www.theses.fr/2012PEST1098

►

Le sujet de cette thèse porte sur la réalisation d'un bloc de transposition de fréquence de 1 à 20GHz à base de composants MEMS. Cette… (more)

▼

Le sujet de cette thèse porte sur la réalisation d'un bloc de transposition de fréquence de 1 à 20GHz à base de composants MEMS. Cette thèse s'est traduite par la conception et la réalisation d'un nouveau type de capacité MEMS RF variable, qui se base sur des structures rotatives de type gyroscope pour l'actionnement, et sur une variation de surface pour la variation de capacité. Comparée à différentes architectures publiées à ce jour, cette structure a l'avantage d'avoir la partie actionnement (la partie MEMS) et la partie RF (la capacité) isolées électriquement, ce qui permet d'éviter le phénomène d'auto actionnement avec la puissance du signal RF traversant. Un autre avantage de la structure développée est la possibilité d'avoir simultanément 8 capacités variables sur une puce unique, avec un seul système d'actionnement. La fabrication de ces puces nécessite l'utilisation d'un wafer SOI pour la partie MEMS et d'un wafer en verre pour la partie RF, ce qui offre la possibilité d'une mise en boitier du MEMS directement pendant le procédé de fabrication. Ces travaux ont également porté sur l'étude du phénomène de pullin dans le cadre des peignes interdigités incurvés (curved combdrive), laissant apparaître les paramètres physiques critiques lors du dimensionnement. Cette étude paramétrique a été utilisée pour améliorer la structure d'actionnement en utilisant des peignes interdigités à largeur de doigt et à gap variable, pour repousser ce phénomène de pullin en dehors de la plage utile d'actionnement. Cette nouvelle capacité variable a ensuite été intégrée dans un système simple d'oscillateur accordable sur alumine pour valider ses performances RF et pourra être associée à un mélangeur pour réaliser le bloc complet de transposition de fréquence

This thesis deals with the realisation of a frequency transposition block from 1 to 20 GHz based on MEMS components. It results in the design and fabrication of a new kind of tuneable RF MEMS capacitor based on a rotational gyroscope structure for the actuation part and on a surface variation for the capacitance change. Compared to other architectures published, this structure presents the advantage to have an actuation part (the MEMS part) and a RF part (the capacitor) that are electrically separated in order to avoid the phenomenon of self-actuation with RF signal crossing power. Another advantage of this structure is the possibility to simultaneously tune 8 different capacitors on a single chip, with only one actuation system. The fabrication of the chips requires the use of a SOI wafer for the MEMS part and a glass wafer for the RF part, which offers on chip packaging opportunity. This work also focused on the study of the pull-in effect in the case of curved comb-drives, highlighting the most critical physical parameters for the design. This parametric study has been used to improve the actuation structure and more particularly the topology of the curved comb-drives by variation of the finger width and gap. These modifications were done in order to push the pull-in…

Advisors/Committee Members: Lissorgues, Gaëlle (thesis director).

Subjects/Keywords: MEMS; RF; WideBand; VCO; MEMS; RF; WideBand; VCO

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pagazani, J. (2012). Transposeurs intégrés ultra large bande continûment accordable de 1 à 20 GHz, utilisant les technologie de silicium micro-usiné dans un perspective de consommation ultra faible (quelques mW) : Ultra wideband transposer integrated continuously tunable from 1-20 GHz, using the technology of silicon micro-machined in a perspective of extremely low power consumption (few mW). (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2012PEST1098

Chicago Manual of Style (16^th Edition):

Pagazani, Julien. “Transposeurs intégrés ultra large bande continûment accordable de 1 à 20 GHz, utilisant les technologie de silicium micro-usiné dans un perspective de consommation ultra faible (quelques mW) : Ultra wideband transposer integrated continuously tunable from 1-20 GHz, using the technology of silicon micro-machined in a perspective of extremely low power consumption (few mW).” 2012. Doctoral Dissertation, Université Paris-Est. Accessed January 17, 2021. http://www.theses.fr/2012PEST1098.

MLA Handbook (7^th Edition):

Pagazani, Julien. “Transposeurs intégrés ultra large bande continûment accordable de 1 à 20 GHz, utilisant les technologie de silicium micro-usiné dans un perspective de consommation ultra faible (quelques mW) : Ultra wideband transposer integrated continuously tunable from 1-20 GHz, using the technology of silicon micro-machined in a perspective of extremely low power consumption (few mW).” 2012. Web. 17 Jan 2021.

Vancouver:

Pagazani J. Transposeurs intégrés ultra large bande continûment accordable de 1 à 20 GHz, utilisant les technologie de silicium micro-usiné dans un perspective de consommation ultra faible (quelques mW) : Ultra wideband transposer integrated continuously tunable from 1-20 GHz, using the technology of silicon micro-machined in a perspective of extremely low power consumption (few mW). [Internet] [Doctoral dissertation]. Université Paris-Est; 2012. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2012PEST1098.

Council of Science Editors:

Pagazani J. Transposeurs intégrés ultra large bande continûment accordable de 1 à 20 GHz, utilisant les technologie de silicium micro-usiné dans un perspective de consommation ultra faible (quelques mW) : Ultra wideband transposer integrated continuously tunable from 1-20 GHz, using the technology of silicon micro-machined in a perspective of extremely low power consumption (few mW). [Doctoral Dissertation]. Université Paris-Est; 2012. Available from: http://www.theses.fr/2012PEST1098

University of Bradford

19. Tu, Yuxiang X. Design, modelling and implementation of several multi-standard high performance single-wideband and multi-wideband microwave planar filters.

Degree: PhD, 2016, University of Bradford

URL: http://hdl.handle.net/10454/15720

► The objectives of this work are to review, investigate and model the microwave planar filters of the modern wireless communication system. The recent main stream… (more)

Subjects/Keywords: 621.38; Microwave planar filters; Asymmetric stepped impedance resonator (ASIR); Multi-standard; Single-wideband; Dual-wideband; Triple-wideband; Quadruple-wideband; Quint-wideband filters; Wide stopband; Wireless communication

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tu, Y. X. (2016). Design, modelling and implementation of several multi-standard high performance single-wideband and multi-wideband microwave planar filters. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/15720

Chicago Manual of Style (16^th Edition):

Tu, Yuxiang X. “Design, modelling and implementation of several multi-standard high performance single-wideband and multi-wideband microwave planar filters.” 2016. Doctoral Dissertation, University of Bradford. Accessed January 17, 2021. http://hdl.handle.net/10454/15720.

MLA Handbook (7^th Edition):

Tu, Yuxiang X. “Design, modelling and implementation of several multi-standard high performance single-wideband and multi-wideband microwave planar filters.” 2016. Web. 17 Jan 2021.

Vancouver:

Tu YX. Design, modelling and implementation of several multi-standard high performance single-wideband and multi-wideband microwave planar filters. [Internet] [Doctoral dissertation]. University of Bradford; 2016. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10454/15720.

Council of Science Editors:

Tu YX. Design, modelling and implementation of several multi-standard high performance single-wideband and multi-wideband microwave planar filters. [Doctoral Dissertation]. University of Bradford; 2016. Available from: http://hdl.handle.net/10454/15720

NSYSU

20. Liu, Po-Ting. A C-band MIMO Antenna with Isolation and Gain Enhancement for MIMO Radar Application.

Degree: Master, Electrical Engineering, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712114-141227

► Recently, the concept of MIMO communications has created considerable attention both in mobile communications and advanced radar technology. In MIMO radar technology, the antenna should… (more)

Subjects/Keywords: gain enhancement; superstrate; isolation; wideband; MIMO

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, P. (2014). A C-band MIMO Antenna with Isolation and Gain Enhancement for MIMO Radar Application. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712114-141227

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Po-Ting. “A C-band MIMO Antenna with Isolation and Gain Enhancement for MIMO Radar Application.” 2014. Thesis, NSYSU. Accessed January 17, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712114-141227.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Po-Ting. “A C-band MIMO Antenna with Isolation and Gain Enhancement for MIMO Radar Application.” 2014. Web. 17 Jan 2021.

Vancouver:

Liu P. A C-band MIMO Antenna with Isolation and Gain Enhancement for MIMO Radar Application. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Jan 17]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712114-141227.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu P. A C-band MIMO Antenna with Isolation and Gain Enhancement for MIMO Radar Application. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712114-141227

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

21. Harbert, Kyle. Ultra-Wideband receiver implementation using analog correlators.

Degree: MS, Electrical and Computer Engineering, 2004, Oregon State University

URL: http://hdl.handle.net/1957/10467

► This paper proposes a novel means of using analog correlators to improve upon existing Ultra-Wideband receiver architectures. Current architectures aim for an all-digital design for… (more)

Subjects/Keywords: Ultra-wideband devices

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Harbert, K. (2004). Ultra-Wideband receiver implementation using analog correlators. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/10467

Chicago Manual of Style (16^th Edition):

Harbert, Kyle. “Ultra-Wideband receiver implementation using analog correlators.” 2004. Masters Thesis, Oregon State University. Accessed January 17, 2021. http://hdl.handle.net/1957/10467.

MLA Handbook (7^th Edition):

Harbert, Kyle. “Ultra-Wideband receiver implementation using analog correlators.” 2004. Web. 17 Jan 2021.

Vancouver:

Harbert K. Ultra-Wideband receiver implementation using analog correlators. [Internet] [Masters thesis]. Oregon State University; 2004. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1957/10467.

Council of Science Editors:

Harbert K. Ultra-Wideband receiver implementation using analog correlators. [Masters Thesis]. Oregon State University; 2004. Available from: http://hdl.handle.net/1957/10467

Oregon State University

22. Venkatesan, Vinod. Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access.

Degree: MS, Electrical and Computer Engineering, 2004, Oregon State University

URL: http://hdl.handle.net/1957/11542

► There has been tremendous technological advancement in the area of high-speed indoor wireless local area networks (WLAN's) in recent years. All the existing tech- nologies… (more)

Subjects/Keywords: Ultra-wideband devices

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Venkatesan, V. (2004). Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11542

Chicago Manual of Style (16^th Edition):

Venkatesan, Vinod. “Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access.” 2004. Masters Thesis, Oregon State University. Accessed January 17, 2021. http://hdl.handle.net/1957/11542.

MLA Handbook (7^th Edition):

Venkatesan, Vinod. “Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access.” 2004. Web. 17 Jan 2021.

Vancouver:

Venkatesan V. Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access. [Internet] [Masters thesis]. Oregon State University; 2004. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1957/11542.

Council of Science Editors:

Venkatesan V. Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access. [Masters Thesis]. Oregon State University; 2004. Available from: http://hdl.handle.net/1957/11542

Cornell University

23. Yang, Dong. Wideband Highly Integrated Software-Defined Radio For Duplex Communication.

Degree: PhD, Electrical Engineering, 2015, Cornell University

URL: http://hdl.handle.net/1813/40917

► The passive mixer-first architecture has been known as the most promising solution for wideband, fully integrated software-defined radios. In this dissertation, a comprehensive model of… (more)

Subjects/Keywords: Wideband Transceivers; Duplex Communication; Passive Mixers

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yang, D. (2015). Wideband Highly Integrated Software-Defined Radio For Duplex Communication. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/40917

Chicago Manual of Style (16^th Edition):

Yang, Dong. “Wideband Highly Integrated Software-Defined Radio For Duplex Communication.” 2015. Doctoral Dissertation, Cornell University. Accessed January 17, 2021. http://hdl.handle.net/1813/40917.

MLA Handbook (7^th Edition):

Yang, Dong. “Wideband Highly Integrated Software-Defined Radio For Duplex Communication.” 2015. Web. 17 Jan 2021.

Vancouver:

Yang D. Wideband Highly Integrated Software-Defined Radio For Duplex Communication. [Internet] [Doctoral dissertation]. Cornell University; 2015. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1813/40917.

Council of Science Editors:

Yang D. Wideband Highly Integrated Software-Defined Radio For Duplex Communication. [Doctoral Dissertation]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40917

Texas A&M University

24. Luo, Yuan. A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique.

Degree: MS, Electrical Engineering, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/156426

► Silicon based complementary metallic oxide semiconductor (CMOS) and Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) radio frequency integrated circuits (RFICs), including microwave and millimeter-wave (MMW), are… (more)

▼ Silicon based complementary metallic oxide semiconductor (CMOS) and Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) radio frequency integrated circuits (RFICs), including microwave and millimeter-wave (MMW), are attractive for wireless communication and sensing systems due to their small chip size and facilitation in system-on-chip integration. One of the most important RFICs is the low-noise amplifier (LNA). The design of CMOS/BiCMOS wideband LNAs at MMW frequencies, especially those working across several decades of frequency, is challenging due to various issues. For instance, the device parasitic and inter-coupling between nearby elements in highly condensed chip areas limits the operating bandwidth and performance, and the conductive silicon substrates lead to the inevitable low quality factor of passive elements. In this work, a MMW BiCMOS ultra-wideband LNA across 20 to 57 GHz is presented along with the analysis, design and measurement results. To overcome the upper-band gain degradation and improve the in-band flatness, a novel frequency controlled positive-negative (P-N) feedback topology is adopted to modify the gain response by boosting the gain at the upper-band while suppressing that at the lower-band. To reduce overall power consumption, the first and second stages of the amplifier are stacked between supply voltage and DC ground to utilize the same DC current. At the output of amplifier, a shunt-peaking load stage is utilized to achieve wideband output matching. The designed ultra-wideband MMW LNA is fabricated in JAZZ 0.18-μm BiCMOS technology. It shows a measured power gain of 10.5 ± 0.5 dB, a noise figure between 5.1-7.0 dB, input and output return losses better than -10 and -15 dB, respectively, an input 1 dB compression point higher than -19 dBm, and an input third-order intercept point greater than -8 dBm. It dissipates 16.6 mW from 1.8 V DC supply and has a chip area of 700×400 μm². Advisors/Committee Members: Nguyen, Cam (advisor), Sánchez-Sinencio, Edgar (committee member), Kish, Laszlo (committee member), Mohanty, Binayak (committee member).

Subjects/Keywords: Low Noise Amplifier; Millimeter Wave Frequency; Wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Luo, Y. (2015). A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156426

Chicago Manual of Style (16^th Edition):

Luo, Yuan. “A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique.” 2015. Masters Thesis, Texas A&M University. Accessed January 17, 2021. http://hdl.handle.net/1969.1/156426.

MLA Handbook (7^th Edition):

Luo, Yuan. “A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique.” 2015. Web. 17 Jan 2021.

Vancouver:

Luo Y. A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969.1/156426.

Council of Science Editors:

Luo Y. A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156426

Penn State University

25. Shin, Hee Jung. Ultra wideband noise tomography: principles and validation.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/26626

► Imaging techniques have been used for a long time in many applications such as nondestructive testing, medical diagnosis, civil infrastructure assessment, and homeland security. Advances… (more)

▼ Imaging techniques have been used for a long time in many applications such as nondestructive testing, medical diagnosis, civil infrastructure assessment, and homeland security. Advances in signal and image processing techniques have made considerable progress in a way that the multi-dimensional images of the target object are successfully reconstructed from electromagnetic (EM) scattering; the shape of the object is clearly identified by visual inspection. The dissertation explores the diffraction tomographic imaging of a target object using ultra-wideband (UWB) white Gaussian noise (WGN) waveforms in radar system. The principles and validation of UWB noise radar system for tomography application are presented including the theoretical analysis, numerical simulations and experimental results. Using WGN waveform as the transmit signal ensures the low probability of intercept (LPI) since the transmitted noise waveform is constantly varying and never repeats exactly. Ideally, such a signal is a stochastic process with a flat spectral density over a wide frequency range; however, the spectral density of WGN cannot be uniform and consistent for all frequencies in reality. In order to obtain a flat spectral density over the desired frequency range, a method of averaging multiple independent and identically distributed (iid) noise waveforms is proposed. From the simulation results, tomographic images of various target scenarios are successfully reconstructed with random noise waveforms. In addition, the hardware system of bistatic UWB noise radar for tomographic imaging application is designed and implemented. The tomographic image processing technique for large sets of collected data samples are also proposed. Both metallic and dielectric target objects are correctly imaged based on measured scattering data, and the experimental results compare well with the numerical simulation results. Advisors/Committee Members: Ram Mohan Narayanan, Dissertation Advisor/Co-Advisor, Douglas Henry Werner, Committee Member, Kenneth Jenkins, Committee Member, Karl Martin Reichard, Committee Member.

Subjects/Keywords: Noise radar; diffraction tomography; Ultra wideband

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shin, H. J. (2015). Ultra wideband noise tomography: principles and validation. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/26626

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shin, Hee Jung. “Ultra wideband noise tomography: principles and validation.” 2015. Thesis, Penn State University. Accessed January 17, 2021. https://submit-etda.libraries.psu.edu/catalog/26626.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shin, Hee Jung. “Ultra wideband noise tomography: principles and validation.” 2015. Web. 17 Jan 2021.

Vancouver:

Shin HJ. Ultra wideband noise tomography: principles and validation. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 17]. Available from: https://submit-etda.libraries.psu.edu/catalog/26626.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shin HJ. Ultra wideband noise tomography: principles and validation. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/26626

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

26. Ibrahim, Mohammed. Design, Modelling and Fabrication of a Hybrid Energy Harvester.

Degree: 2014, University of Waterloo

URL: http://hdl.handle.net/10012/8172

► As sources of energy are becoming more scarce and expensive, energy harvesting is receiving more global interest and is currently a growing field. Energy harvesting… (more)

▼ As sources of energy are becoming more scarce and expensive, energy harvesting is receiving more global interest and is currently a growing field. Energy harvesting is the process of converting ambient energy, such as vibration, to electrical energy that can power a multitude of applications. Vibration energy is the by-product of everyday life; it is generated from any perceivable activity. While typically viewed as noise, there is a strong potential for harvesting this energy and deploying it to useful applications. The focus of this thesis will be using vibration as the ambient source of energy. Hybrid energy harvesters employ more than one of the harvesting technologies. In this thesis, two hybrid harvesters that utilize piezoelectric, magnetostrictive, and electromagnetic technologies are designed, modelled, and tested. Both of these harvesters have beams that are spiral in shape. The use of the spiral geometry allows the system to have a lower natural frequency as opposed to the traditional cantilever beam, while still maintaining a high volume of active material. The first harvester that is discussed is the P-MSM harvester. It utilizes piezoelectric and magnetostrictive material. Both materials are configured in a spiral beam geometry and allowed to resonate independently. The resonance frequency of these two materials is designed to create wideband energy harvesting. This allows the harvester to be operating efficiently even if the ambient vibration shifts a small amount. The second harvester that is discussed is the P-MAG harvester. It utilizes piezoelectric and electromagnetic technologies. It also incorporates a spiral geometry for the piezoelectric layers and includes a magnet attached at the centre. The magnet is placed in the centre of the spiral to reduce the natural frequency of the system and to also actively contribute to the harvesting. This harvester has two sources operating at the same resonant frequency, which allows it to have a larger power output than if the sources were separated. Finally, finite element analysis was used to model both harvesters. ANSYS was used for the piezoelectric material and COMSOL was used for the electromagnetic material. The results are compared to the experimental and are in good agreement.

Subjects/Keywords: Energy Harvesting; Piezoelectric; Hybrid; Wideband; Magnetostrictive

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ibrahim, M. (2014). Design, Modelling and Fabrication of a Hybrid Energy Harvester. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8172

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ibrahim, Mohammed. “Design, Modelling and Fabrication of a Hybrid Energy Harvester.” 2014. Thesis, University of Waterloo. Accessed January 17, 2021. http://hdl.handle.net/10012/8172.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ibrahim, Mohammed. “Design, Modelling and Fabrication of a Hybrid Energy Harvester.” 2014. Web. 17 Jan 2021.

Vancouver:

Ibrahim M. Design, Modelling and Fabrication of a Hybrid Energy Harvester. [Internet] [Thesis]. University of Waterloo; 2014. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10012/8172.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ibrahim M. Design, Modelling and Fabrication of a Hybrid Energy Harvester. [Thesis]. University of Waterloo; 2014. Available from: http://hdl.handle.net/10012/8172

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Delaware

27. Bai, Jian. Optically addressed ultra-wideband phased antenna array.

Degree: PhD, University of Delaware, Department of Electrical and Computer Engineering, 2014, University of Delaware

URL: http://udspace.udel.edu/handle/19716/16710

► Demands for high data rate and multifunctional apertures from both civilian and military users have motivated development of ultra-wideband (UWB) electrically steered phased arrays. Meanwhile,… (more)

▼ Demands for high data rate and multifunctional apertures from both civilian and military users have motivated development of ultra-wideband (UWB) electrically steered phased arrays. Meanwhile, the need for large contiguous frequency is pushing operation of radio systems into the millimeter-wave (mm-wave) range. Therefore, modern radio systems require UWB performance from VHF to mm-wave. However, traditional electronic systems suffer many challenges that make achieving these requirements difficult. Several examples includes: voltage controlled oscillators (VCO) cannot provide a tunable range of several octaves, distribution of wideband local oscillator signals undergo high loss and dispersion through RF transmission lines, and antennas have very limited bandwidth or bulky sizes. Recently, RF photonics technology has drawn considerable attention because of its advantages over traditional systems, with the capability of offering extreme power efficiency, information capacity, frequency agility, and spatial beam diversity. A hybrid RF photonic communication system utilizing optical links and an RF transducer at the antenna potentially provides ultra-wideband data transmission, i.e., over 100 GHz. A successful implementation of such an optically addressed phased array requires addressing several key challenges. Photonic generation of an RF source with over a seven-octave bandwidth has been demonstrated in the last few years. However, one challenge which still remains is how to convey phased optical signals to downconversion modules and antennas. Therefore, a feed network with phase sweeping capability and low excessive phase noise needs to be developed. Another key challenge is to develop an ultra-wideband array antenna. Modern frontends require antennas to be compact, planar, and low-profile in addition to possessing broad bandwidth, conforming to stringent space, weight, cost, and power constraints. To address these issues, I will study broadband and miniaturization techniques for both single and array antennas. In addition, a prototype transmitting phased array system is developed and shown to demonstrate large bandwidth as well as a beam steering capability. The architecture of this system can be further developed to a large-scale array at higher frequencies such as mm-wave. This solution serves as a candidate for UWB multifunctional frontends. Advisors/Committee Members: Prather, Dennis.

Subjects/Keywords: Ultra-wideband antennas.; Antenna arrays.; Optical communications.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bai, J. (2014). Optically addressed ultra-wideband phased antenna array. (Doctoral Dissertation). University of Delaware. Retrieved from http://udspace.udel.edu/handle/19716/16710

Chicago Manual of Style (16^th Edition):

Bai, Jian. “Optically addressed ultra-wideband phased antenna array.” 2014. Doctoral Dissertation, University of Delaware. Accessed January 17, 2021. http://udspace.udel.edu/handle/19716/16710.

MLA Handbook (7^th Edition):

Bai, Jian. “Optically addressed ultra-wideband phased antenna array.” 2014. Web. 17 Jan 2021.

Vancouver:

Bai J. Optically addressed ultra-wideband phased antenna array. [Internet] [Doctoral dissertation]. University of Delaware; 2014. [cited 2021 Jan 17]. Available from: http://udspace.udel.edu/handle/19716/16710.

Council of Science Editors:

Bai J. Optically addressed ultra-wideband phased antenna array. [Doctoral Dissertation]. University of Delaware; 2014. Available from: http://udspace.udel.edu/handle/19716/16710

University of Adelaide

28. Sharp, Alexander. Toward optical architectures in radar system design for ultralight unmanned aerial vehicles.

Degree: 2012, University of Adelaide

URL: http://hdl.handle.net/2440/75758

► A thesis is presented on the deployment of radar systems on ultra light unmanned aerial vehicles which are compact and lightweight. Deployment upon a small… (more)

▼ A thesis is presented on the deployment of radar systems on ultra light unmanned aerial vehicles which are compact and lightweight. Deployment upon a small frame presents significant problems due to the size, weight and power (SWaP) requirements of components and which are addressed in this work. Traditional pulsed radar is inadequate due to these considerations and alternatively, a frequency modulated continuous wave (FMCW) radar architecture is proposed. Optical systems, due to their light weight, bandwidth and resistance to interference are a possible implementation for the radar front end. Optical architecture implementations suffer from low signal to noise ratio and low spurious free dynamic range. Employment of an optical architecture for a narrow band radar would be inefficient and its performance would be substandard. Instead a focus on a wide bandwidth is pursued. The advantages of deploying a wide bandwidth, frequency agile radar are its resistance to jamming and the receiver's usefulness as a radar warning receiver. An investigation into optical systems discovers an optical architecture that is highly resistant to environmental changes making it robust, easy to maintain and inexpensive to deploy. A COTS based beam forming array is designed within the optical system. The beam former allows for multiple apertures and multiple beams, a feature previously limited to expensive, complex array architectures. The author presents a COTS based solution for optical mixing, which is both wideband and exploits the linearity of phase modulated optical paths to provide linear mixing. The topology suffers some degradation due to the inherent environmental sensitivity of phase modulated optical fibres. The author presents a means to stabilize the output of the optical mixer, making it suitable for deployment upon an operational platform. The technique can be miniaturized as a new form of optical modulator. This optical front end can be integrated into a full, microwave to digital-at-IF radar. This breakthrough allows the use of millimeter wave carrier frequencies with low IF topologies for digital receivers. Using a low IF eliminates the problems of data overflow and Nyquist sampling limits inherent in available electronic analog to digital converters. Wideband antennas are designed that are compact, light weight and are built from rugged materials. These antennas are simulated to show a 2 – 40+ GHz bandwidth. A series of lower bandwidth 2 -25 GHz antennas are fabricated and the parameters which enable wide bandwidth operation are investigated. The difficulty employing antennas in an array is the creation of grating lobes, through separation of the antennas. The application of medical research in ultrasound shows that an efficient beam former without grating lobes can be created by the use of two different apertures. A Vernier array of two antennas is proposed which increases the effective antenna aperture by a factor of four. A linear 8 port antenna array at the transmitter and an 8 port array at the receiver becomes a 64… Advisors/Committee Members: Bates, Bevan Douglas (advisor), School of Electrical and Electronic Engineering (school).

Subjects/Keywords: optical; communications; radar; wideband antennas; UAV; unmanned

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sharp, A. (2012). Toward optical architectures in radar system design for ultralight unmanned aerial vehicles. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/75758

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sharp, Alexander. “Toward optical architectures in radar system design for ultralight unmanned aerial vehicles.” 2012. Thesis, University of Adelaide. Accessed January 17, 2021. http://hdl.handle.net/2440/75758.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sharp, Alexander. “Toward optical architectures in radar system design for ultralight unmanned aerial vehicles.” 2012. Web. 17 Jan 2021.

Vancouver:

Sharp A. Toward optical architectures in radar system design for ultralight unmanned aerial vehicles. [Internet] [Thesis]. University of Adelaide; 2012. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2440/75758.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sharp A. Toward optical architectures in radar system design for ultralight unmanned aerial vehicles. [Thesis]. University of Adelaide; 2012. Available from: http://hdl.handle.net/2440/75758

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Houston

29. Sharma, Sarthak 1994-. Device Free Activity Recognition using Ultra-Wideband Radio Communication.

Degree: MS, Computer Science, 2018, University of Houston

URL: http://hdl.handle.net/10657/3303

► Human Activity Recognition (HAR) is a fundamental building block in many Internet of Things (IoT) applications. Although there has been a lot of interest in… (more)

Subjects/Keywords: Ultra-Wideband; Device Free; Activity recognition

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sharma, S. 1. (2018). Device Free Activity Recognition using Ultra-Wideband Radio Communication. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/3303

Chicago Manual of Style (16^th Edition):

Sharma, Sarthak 1994-. “Device Free Activity Recognition using Ultra-Wideband Radio Communication.” 2018. Masters Thesis, University of Houston. Accessed January 17, 2021. http://hdl.handle.net/10657/3303.

MLA Handbook (7^th Edition):

Sharma, Sarthak 1994-. “Device Free Activity Recognition using Ultra-Wideband Radio Communication.” 2018. Web. 17 Jan 2021.

Vancouver:

Sharma S1. Device Free Activity Recognition using Ultra-Wideband Radio Communication. [Internet] [Masters thesis]. University of Houston; 2018. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10657/3303.

Council of Science Editors:

Sharma S1. Device Free Activity Recognition using Ultra-Wideband Radio Communication. [Masters Thesis]. University of Houston; 2018. Available from: http://hdl.handle.net/10657/3303

30. Barral Vales, Valentín. Ultra Wideband location in scenarios without clear line of sight: a practical approach .

Degree: 2019, Universidad da Coruña

URL: http://hdl.handle.net/2183/24728

► [Abstract] Indoor location has experienced a major boost in recent years. location based services (LBS), which until recently were restricted to outdoor scenarios and the… (more)

▼ [Abstract] Indoor location has experienced a major boost in recent years. location based services (LBS), which until recently were restricted to outdoor scenarios and the use of GPS, have also been extended into buildings. From large public structures such as airports or hospitals to a multitude of industrial scenarios, LBS has become increasingly present in indoor scenarios. Of the various technologies that can be used to achieve this indoor location, the ones based on ultrawideband (UWB) signals have become ones of the most demanded due primarily to their accuracy in position estimation. Additionally, the appearance in the market of more and more manufacturers and products has lowered the prices of these devices to levels that allow to think about their use for large deployments with a contained budget. By their nature, UWB signals are very resistant to the multi-path phenomenon, so in a situation of good direct vision between two devices (line-of-sight (LOS)) the technology is able to provide very accurate distance estimates. This is not the case when this line of sight is totally or partially blocked (non-line-of-sight (NLOS)). In this case the possible rebounds of the signal can be wrongly confused with the original emitted signal and result in an estimate of time, and therefore distance, very far from the actual value. The aim of this thesis is to offer a complete solution to the problem of indoor location with UWB from a practical approach. This means that the problem is approached from all the angles that should be taken into account in a real use case: basic research in search of an improvement at technical level of the UWB values, prior simulation to ensure a good deployment and performance and the final integration of the solution within an external operational system that allows LBS or clients to make use of location data. The first part of this proposal is presented in this thesis in the first chapters, and consists of using machine learning (ML) techniques to detect and mitigate the possible NLOS measurements generated by low-cost UWB devices. For this task the memory describes the different measurement campaigns with real hardware that were carried out to obtain the training data of the algorithms, and how these were used in different experiments to measure to what extent the proposed solution was valid in a real environment. The second part of the thesis presents data from a location-oriented UWB devices simulator created to perform tests and detect possible problems before deploying real hardware. Among the data presented during this second part, different comparisons between real and simulated scenarios are shown in order to check how reliable the simulation is. In addition, the simulator is presented as part of a case commonly used in indoor location systems: the location of vehicles in an industrial environment using multiple sensors. Finally, the third and final part of this thesis describes a multi-technology real-time location system (RTLS) capable of serving the… Advisors/Committee Members: Escudero, Carlos J (advisor).

Subjects/Keywords: Indoor positioning; Ultra-wideband; Machine learning

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Barral Vales, V. (2019). Ultra Wideband location in scenarios without clear line of sight: a practical approach . (Doctoral Dissertation). Universidad da Coruña. Retrieved from http://hdl.handle.net/2183/24728

Chicago Manual of Style (16^th Edition):

Barral Vales, Valentín. “Ultra Wideband location in scenarios without clear line of sight: a practical approach .” 2019. Doctoral Dissertation, Universidad da Coruña. Accessed January 17, 2021. http://hdl.handle.net/2183/24728.

MLA Handbook (7^th Edition):

Barral Vales, Valentín. “Ultra Wideband location in scenarios without clear line of sight: a practical approach .” 2019. Web. 17 Jan 2021.

Vancouver:

Barral Vales V. Ultra Wideband location in scenarios without clear line of sight: a practical approach . [Internet] [Doctoral dissertation]. Universidad da Coruña; 2019. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2183/24728.

Council of Science Editors:

Barral Vales V. Ultra Wideband location in scenarios without clear line of sight: a practical approach . [Doctoral Dissertation]. Universidad da Coruña; 2019. Available from: http://hdl.handle.net/2183/24728

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations