2026-09-22T14:55:50Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/90975 2023-07-11 col_2142_5131 com_2142_5130

Bernhard, Jennifer T. Wilken-Resman, Elias 2016-07-07T21:18:12Z 2016-07-07T21:18:12Z 2018-07-08T09:15:20Z 2016-04-29 2016-05 Radiation efficiency measurement can inform the wireless design process by determining the total fraction of accepted power radiated by an antenna. The popular Wheeler cap method can be used to quickly and accurately determine the radiation efficiency of small antennas. However, due to cavity resonant modes and the use of a simplistic equivalent circuit model, the conventional Wheeler cap method yields poor results for electrically larger structures. When efficiency estimates can be obtained, they are often valid only over a narrow frequency band. Higher-order equivalent circuit models may be employed in a modified Wheeler cap algorithm to generate improved radiation efficiency measurements. Guided by advances in broadband modeling of antennas, we demonstrate a new Wheeler cap technique that makes use of parallel admittance subcircuits. We then illustrate the use of this technique to provide improved efficiency estimates at the operating frequencies of electrically larger structures. Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-05-01 The student, Elias Wilken-Resman, accepted the attached license on 2016-04-29 at 08:28. The student, Elias Wilken-Resman, submitted this Thesis for approval on 2016-04-29 at 08:29. This Thesis was approved for publication on 2016-04-29 at 09:09. DSpace SAF Submission Ingestion Package generated from Vireo submission #9575 on 2016-07-07 at 14:18:11 Made available in DSpace on 2016-07-07T21:18:12Z (GMT). No. of bitstreams: 2 WILKEN-RESMAN-THESIS-2016.pdf: 9611717 bytes, checksum: 474b8b03e1d03b4a0f66265a43f39c29 (MD5) LICENSE.txt: 4216 bytes, checksum: 9d99f6cf28b8974bd7af9b4282cfb6d2 (MD5) Previous issue date: 2016-04-29 Embargo set by: Seth Robbins for item 93330 Lift date: 2018-07-07T21:18:16Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Limited Restriction Lifted for Item 93330 on 2018-07-08T09:15:20Z. application/pdf http://hdl.handle.net/2142/90975 en Copyright 2016 Elias Wilken-Resman antennas antenna radiation efficiency Measurement of antenna radiation efficiency using improved Wheeler cap algorithm text text Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Thesis M.S.