{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/81073"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/81073","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analysis and Design of a Broadband Antenna for Software Defined Radio","abstract":"This work presents the design and analysis of a broadband antenna capable of achieving an instantaneous 3:1 VSWR bandwidth and omnidirectional radiation coverage spanning a bandwidth greater than 20:1. The antenna is designed to accommodate the very large bandwidth requirements of software-defined radios and to minimize the effective volume of the overall design. The antenna is composed of a vertical radiating element over a wound plane, and utilizes a tuning strap to improve the impedance bandwidth over the frequency range in which the antenna is considered electrically small. Measurements demonstrate a 3:1 VSWR impedance bandwidth from 30 MHz to 6 GHz while maintaining a relatively omnidirectional radiation pattern over the majority of this bandwidth. Equivalent circuit model and analytical model are developed to calculate the input impedance of the antenna over different spectrums. A model of the tuning mechanism is also analyzed along with a discussion of the antenna's efficiency.","abstract_html":"This work presents the design and analysis of a broadband antenna capable of achieving an instantaneous 3:1 VSWR bandwidth and omnidirectional radiation coverage spanning a bandwidth greater than 20:1. The antenna is designed to accommodate the very large bandwidth requirements of software-defined radios and to minimize the effective volume of the overall design. The antenna is composed of a vertical radiating element over a wound plane, and utilizes a tuning strap to improve the impedance bandwidth over the frequency range in which the antenna is considered electrically small. Measurements demonstrate a 3:1 VSWR impedance bandwidth from 30 MHz to 6 GHz while maintaining a relatively omnidirectional radiation pattern over the majority of this bandwidth. Equivalent circuit model and analytical model are developed to calculate the input impedance of the antenna over different spectrums. A model of the tuning mechanism is also analyzed along with a discussion of the antenna's efficiency.","abstract_has_math":false,"creators":["Zhang, Zhuohui"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical and Computer Engineering","degree_department":null,"school":null,"contributors":["Jennifer Bernhard"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T20:09:29Z","date_published":"2015-09-25T20:09:29Z","updated_at":"2026-07-22T22:26:15Z","subjects":["Engineering, Electronics and Electrical"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3301258"],"render_values":[{"text":"(MiAaPQ)AAI3301258","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/81073","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Jennifer Bernhard"]},{"key":"dc:creator","label":"Author","values":["Zhang, Zhuohui"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T20:09:29Z","10000-01-01","2007"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical and Computer Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Electronics and Electrical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/81073","(MiAaPQ)AAI3301258"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This work presents the design and analysis of a broadband antenna capable of achieving an instantaneous 3:1 VSWR bandwidth and omnidirectional radiation coverage spanning a bandwidth greater than 20:1. 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The antenna is designed to accommodate the very large bandwidth requirements of software-defined radios and to minimize the effective volume of the overall design. The antenna is composed of a vertical radiating element over a wound plane, and utilizes a tuning strap to improve the impedance bandwidth over the frequency range in which the antenna is considered electrically small. Measurements demonstrate a 3:1 VSWR impedance bandwidth from 30 MHz to 6 GHz while maintaining a relatively omnidirectional radiation pattern over the majority of this bandwidth. Equivalent circuit model and analytical model are developed to calculate the input impedance of the antenna over different spectrums. A model of the tuning mechanism is also analyzed along with a discussion of the antenna's efficiency.","Made available in DSpace on 2015-09-25T20:09:29Z (GMT). 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