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You searched for subject:(Evanescent mode). Showing records 1 – 2 of 2 total matches.

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1. Hawatmeh, Derar Fayez. Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas.

Degree: 2018, University of South Florida

The need for miniaturized, and high performance microwave devices has focused significant attention onto new fabrication technologies that can simultaneously achieve high performance and low manufacturing complexity. Additive manufacturing (AM) has proven its capability in fabricating high performance, compact and light weight microwave circuits and antennas, as well as the ability to achieve designs that are complicated to fabricate using other manufacturing approaches. Direct print additive manufacturing (DPAM) is an emerging AM process that combines the fused deposition modeling (FDM) of thermoplastics with micro-dispensing of conductive and insulating pastes. DPAM has the potential to jointly combine high performance and low manufacturing complexity, along with the possibility of real-time tuning. This dissertation aims to leverage the powerful capabilities of DPAM to come-up with new designs and solutions that meet the requirements of rapidly evolving wireless systems and applications. Furthermore, the work in this dissertation provides new techniques and approaches to alleviate the drawbacks and limitations of DPAM fabrication technology. Firstly, the development of 3D packaged antenna, and antenna array are presented along with an analysis of the inherent roughness of 3D printed structures to provide a deeper understanding of the antenna RF performance. The single element presents a new volumetric approach to realizing a 3D half-wave dipole in a packaged format, where it provides the ability to keep a signal distribution network in close proximity to the ground plane, facilitating the implementation of ground connections (e.g. for an active device), mitigating potential surface wave losses, as well as achieving a modest (10.6%) length reduction. In addition, a new approach of implementing conformal antennas using DPAM is presented by printing thin and flexible substrate that can be adhered to 3D structures to facilitate the fabrication and reduce the surface roughness. The array design leverages direct digital manufacturing (DDM) technology to realize a shaped substrate structure that is used to control the array beamwidth. The non-planar substrate allows the element spacing to be changed without affecting the length of the feed network or the distance to the underlying ground plane. The second part describes the first high-Q capacitively-loaded cavity resonator and filter that is compatible with direct print additive manufacturing. The presented design is a compromise between quality factor, cost and manufacturing complexity and to the best of our knowledge is the highest Q-factor resonator demonstrated to date using DPAM compatible materials and processes. The final version of the single resonator achieves a measured unloaded quality factor of 200-325 over the frequency range from 2.0 to 6.5 GHz. The two pole filter is designed using a coupled-resonator approach to operate at 2.44 GHz with 1.9% fractional bandwidth. The presented design approach simplifies evanescent-mode filter fabrication, eliminating…

Subjects/Keywords: 3D-printing; Dipole; Picosecond laser machining; Quality factor; Array; Non-planar; Capacitively-loaded cavity; Evanescent-mode; Stacked structure; Vertically Coupled; Electrical and Computer Engineering; Electromagnetics and Photonics

…10 Figure 2.3 Evanescent mode capacitively-loaded resonator and filter… …34 Figure 4.1 Evanescent-mode cavity resonator… …37 Figure 4.2 Evanescent-mode resonator structure… …38 Figure 4.3 Evanescent-mode cavity resonator fabrication process… …54 Figure 4.21 Laterally coupled evanescent-mode cavity filter (all dimensions are in… 

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

APA (6th Edition):

Hawatmeh, D. F. (2018). Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/7165

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

Chicago Manual of Style (16th Edition):

Hawatmeh, Derar Fayez. “Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas.” 2018. Thesis, University of South Florida. Accessed April 13, 2021. https://scholarcommons.usf.edu/etd/7165.

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

MLA Handbook (7th Edition):

Hawatmeh, Derar Fayez. “Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas.” 2018. Web. 13 Apr 2021.

Vancouver:

Hawatmeh DF. Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas. [Internet] [Thesis]. University of South Florida; 2018. [cited 2021 Apr 13]. Available from: https://scholarcommons.usf.edu/etd/7165.

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

Council of Science Editors:

Hawatmeh DF. Three Dimensional Direct Print Additively Manufactured High-Q Microwave Filters and Embedded Antennas. [Thesis]. University of South Florida; 2018. Available from: https://scholarcommons.usf.edu/etd/7165

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

2. Thomas Lee, S; Dr.Nampoori,V P N. Design. Fabrication and Characterization of Fiber Optic Sensors for Physical and Chemical Applications.

Degree: 2003, Cochin University of Science and Technology

Advent of lasers together with the advancement in fiber optics technology has revolutionized the sensor technology. Advancement in the telemetric applications of optical fiber based measurements is an added bonus. The present thesis describes variety of fiber based sensors using techniques like micro bending, long period grating and evanescent waves. Sensors to measure various physical and chemical parameters are described in this thesis.

International School of Photonics, Cochin University of Science and Technology

Subjects/Keywords: Fiber Optics; Dielectric interfaces; Evanescent wave; Single Mode Fibers; Bandwidth; Fiber optic communication; Attenuation; Dispersion; Fiber optic Sensors; Polarimetric sensors; Spectrophotometry; Sensitive fiber optic pH sensors; Sol-gel glass; Chemical sensing; Microbent optical fibers; Interferometric weight; Displacement sensor; pollution monitoring sensors; Multimode fibers; Grating Fabrication Techniques

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

APA (6th Edition):

Thomas Lee, S. D. N. P. N. (2003). Design. Fabrication and Characterization of Fiber Optic Sensors for Physical and Chemical Applications. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/2117

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

Chicago Manual of Style (16th Edition):

Thomas Lee, S; Dr Nampoori,V P N. “Design. Fabrication and Characterization of Fiber Optic Sensors for Physical and Chemical Applications.” 2003. Thesis, Cochin University of Science and Technology. Accessed April 13, 2021. http://dyuthi.cusat.ac.in/purl/2117.

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

MLA Handbook (7th Edition):

Thomas Lee, S; Dr Nampoori,V P N. “Design. Fabrication and Characterization of Fiber Optic Sensors for Physical and Chemical Applications.” 2003. Web. 13 Apr 2021.

Vancouver:

Thomas Lee SDNPN. Design. Fabrication and Characterization of Fiber Optic Sensors for Physical and Chemical Applications. [Internet] [Thesis]. Cochin University of Science and Technology; 2003. [cited 2021 Apr 13]. Available from: http://dyuthi.cusat.ac.in/purl/2117.

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

Council of Science Editors:

Thomas Lee SDNPN. Design. Fabrication and Characterization of Fiber Optic Sensors for Physical and Chemical Applications. [Thesis]. Cochin University of Science and Technology; 2003. Available from: http://dyuthi.cusat.ac.in/purl/2117

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

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