Open Access Theses and Dissertations

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You searched for subject:(RF Spatial Filtering). Showing records 1 – 2 of 2 total matches.

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University of Oklahoma

1. Irazoqui, Robin. An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays.

Degree: PhD, 2019, University of Oklahoma

URL: http://hdl.handle.net/11244/319751 

Fully digital arrays offer significant advantages in terms of flexibility and performance, however they suffer from dynamic range issues when used in the presence of in-band interferers. Higher dynamic range components may be used, but are more costly and power-hungry, making the implementation of such technology impractical for large arrays. This paper presents a way to mitigate those interferers by creating a spatial notch at the RF front-end with an antenna agnostic circuit placed at the feeding network of the antenna. This circuit creates a steerable null in the embedded element pattern that mitigates interferers at a specified incoming angle. A full mathematical model and closed-form expressions of the behavior of the circuit are obtained and compared to simulated and measured results. Up to 20 dB null in the embedded element pattern of a 1x8 array is achieved with less than 1.5 dB of insertion loss. A steerable null using phase shifters is shown to prove real-time changes in the null placement. Phase shifters are substituted by tunable filters and enable a significant boost in the overall performance. To further validate the concept, a real case scenario is set up with a desired signal and an interferer that is initially saturating the receiver. The receiver successfully demodulates the signal after the null is placed in the direction of the interferer. The circuitry is then expanded to a planar array to fully optimize the interferer-free scanning volume. Advisors/Committee Members: Fulton, Caleb (advisor), Palmer, Robert (committee member), Goodman, Nathan (committee member), Sigmarsson, Hjalti (committee member), Remling, Christian (committee member).

Subjects/Keywords: Radar; Spatial Interference Mitigation; RF Spatial Filtering; Nulling the Embedded Element Pattern

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

APA (6th Edition):

Irazoqui, R. (2019). An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319751

Chicago Manual of Style (16th Edition):

Irazoqui, Robin. “An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed April 18, 2021. http://hdl.handle.net/11244/319751.

MLA Handbook (7th Edition):

Irazoqui, Robin. “An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays.” 2019. Web. 18 Apr 2021.

Vancouver:

Irazoqui R. An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Apr 18]. Available from: http://hdl.handle.net/11244/319751.

Council of Science Editors:

Irazoqui R. An Investigation and Solution to Spatial Interferers Before RF Front End for Phased Arrays. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/319751


Universidade Nova

2. Vidago, Fábio Daniel dos Santos. A Downconversion Beamforming RF Front-End in 130 nm CMOS technology.

Degree: 2017, Universidade Nova

URL: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/20371 

Due to the exponential growth of wireless data communications an increasing number of components compete for space in the frequency spectrum. Nowadays, different approaches have been addressed in order to overcome this problem. One of these approaches is using spatial filters instead of time-domain ones. Since most wireless devices operate by transferring/receiving signals to/from all directions, interfering signals are becoming an increasing problem. Thus steering the transmission/reception of signals in a specific direction alleviates this problem, which is performed by employing multiple antennas. In the scope of the spatial filtering approach, a 1 GHz downconvertion 4-element phased array receiver front-end is presented in this thesis, implemented in 130 nm Complementary Metal Oxide Semiconductor (CMOS) technology. The phase shifting of the beamforming receiver is implemented with a switched-capacitor vector modulator, that excels in its linearity and low power consumption. This receiver also provides a spatial rejection of more than 20 dB and good input matching. Advisors/Committee Members: Oliveira, João.

Subjects/Keywords: CMOS; MIMO systems; Beamforming; Phased arrays; RF receiver; Spatial filtering; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática

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

APA (6th Edition):

Vidago, F. D. d. S. (2017). A Downconversion Beamforming RF Front-End in 130 nm CMOS technology. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/20371

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):

Vidago, Fábio Daniel dos Santos. “A Downconversion Beamforming RF Front-End in 130 nm CMOS technology.” 2017. Thesis, Universidade Nova. Accessed April 18, 2021. http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/20371.

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

MLA Handbook (7th Edition):

Vidago, Fábio Daniel dos Santos. “A Downconversion Beamforming RF Front-End in 130 nm CMOS technology.” 2017. Web. 18 Apr 2021.

Vancouver:

Vidago FDdS. A Downconversion Beamforming RF Front-End in 130 nm CMOS technology. [Internet] [Thesis]. Universidade Nova; 2017. [cited 2021 Apr 18]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/20371.

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

Council of Science Editors:

Vidago FDdS. A Downconversion Beamforming RF Front-End in 130 nm CMOS technology. [Thesis]. Universidade Nova; 2017. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/20371

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

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