2026-09-20T00:42:31Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/120458 2023-09-05 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Bernhard, Jennifer T 2023-05 application/pdf en text Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01 The student, Guilherme Jurgensen, accepted the attached license on 2023-05-03 at 15:15. The student, Guilherme Jurgensen, submitted this Thesis for approval on 2023-05-03 at 15:26. This Thesis was approved for publication on 2023-05-04 at 10:21. DSpace SAF Submission Ingestion Package generated from Vireo submission #19322 on 2023-09-01 at 17:15:57 Investigation of a reconfigurable GPS antenna for direction finding and nulling applications Jurgensen, Guilherme 2023-05-04 Direction Finding Gps Antenna Reconfigurable Antenna In wireless communication systems, the presence of spoofers and jammers present a concern in various applications, such as with Global Positioning System (GPS) signals. This creates a need for the system to have the ability to differentiate spoofed signals from true ones and preferably mitigate them. In this thesis, an antenna capable of performing these functions is presented in the form of a hemispherical spiral, or "hemispiral," antenna. The antenna operates via differential feeding, producing a steerable null in its radiation pattern, which results in distinct patterns to allow for direction of arrival estimation. This thesis presents this already fabricated antenna, then proposes modifications to the structure with the goal of increasing the angular extent of its direction finding region. Preliminary simulation data is presented, followed by experimental data taken to validate simulations. An additional investigation is performed in response to the results obtained in preliminary measurements, and a discussion of this investigation concludes the thesis. Text eng https://hdl.handle.net/2142/120458 Copyright 2023 Guilherme Jurgensen M.S. Thesis Electrical & Computer Engr University of Illinois at Urbana-Champaign Electrical & Computer Eng