Analysis and Design of a Broadband Antenna for Software Defined Radio
Zhang, Zhuohui
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https://hdl.handle.net/2142/81073
Description
Title
Analysis and Design of a Broadband Antenna for Software Defined Radio
Author(s)
Zhang, Zhuohui
Issue Date
2007
Doctoral Committee Chair(s)
Jennifer Bernhard
Department of Study
Electrical and Computer Engineering
Discipline
Electrical and Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
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.
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