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ANALYSIS AND DESIGN OF
WIDEBAND ARRAY ANTENNAS
by
Jeffrey Ming-Jer Yang
——————————————————————————————————–
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
May 2011
Copyright 2011 Jeffrey Ming-Jer Yang
Object Description
| Title | Analysis and design of wideband array antennas |
| Author | Yang, Jeffrey Ming-Jer |
| Author email | jeff.yang@ngc.com; jmyngc@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2011-02-08 |
| Date submitted | 2011 |
| Restricted until | Restricted until 16 Feb. 2012. |
| Date published | 2012-02-16 |
| Advisor (committee chair) | Prata, Aluizio |
| Advisor (committee member) |
Steier, William H. Scholtz, Robert A. Pilch, Krzysztof |
| Abstract | An array antenna consists of a group of radiating elements forming a single aperture to transmit and receive electromagnetic energy. This work focuses on the analysis, development, and design of array antennas geared towards operation over wide frequency bandwidths. As a consequence of the present effort, both the geometry and the operation theory of a louver array antenna are developed, and their use in wide-band antenna arrays investigated.; This dissertation begins by first establishing the electromagnetic boundary condition associated with the radiating aperture of an antenna array made of identical cells. Then, it proceeds to impose this condition on Maxwell's equations to yield the array radiated field as an infinite plane wave spectrum.; To properly investigate the energy transfer efficiency of an array, from circuit to free space, the Poynting theorem is used to determine the power balance equation of the antenna. From this analysis, an aperture reflection coefficient is defined and introduced as a convenient figure-of-merit to gauge the effectiveness of the antenna as an energy transducer. For demonstration purposes, this aperture reflection coefficient is then applied to study the characteristics of the frequently used rectangular microstrip patch array. It is shown that the patch array geometry is prone to excite evanescent fields (i.e., store reactive energy) in its aperture region, causing it to require a highly reactive, and therefore narrow band, matching network behind each element to ensure proper operation. In contrast, the louver array primarily excites a dominant mode field that exactly emulates the desired radiated plane wave, with nearly no evanescent field generation. Since a band-limiting matching structure is not required (to compensate evanescent fields), the louver antenna is inherently wideband. In addition to this fact, the louver antenna is amenable to be integrated directly with semiconductor electronics. This feature allows the future implementation of a densely populated array antenna with fractional wavelength element spacing to enable broad band, wide angle, grating-lobe-free beam scan.; Even though no experimental work was performed for this research, a systematic array design and analysis procedure is presented at the end of this dissertation. To demonstrate their application, a louver array antenna is then designed for a 30-to-1 operation frequency band. As a preliminary validation, this louver array is then modeled using an established commercial finite-element numerical analysis software. Both the analytically and the numerically predicted array performances obtained show close agreement. This validates the design and analysis procedures presented, as well as demonstrate their applicability for implementing high efficiency, wideband, wide scan angle array antennas. |
| Keyword | wideband; array; antenna |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m3663 |
| Contributing entity | University of Southern California |
| Rights | Yang, Jeffrey Ming-Jer |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@lib.usc.edu |
| Filename | etd-Yang-4290 |
| Archival file | uscthesesreloadpub_Volume44/etd-Yang-4290.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | ANALYSIS AND DESIGN OF WIDEBAND ARRAY ANTENNAS by Jeffrey Ming-Jer Yang ——————————————————————————————————– A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) May 2011 Copyright 2011 Jeffrey Ming-Jer Yang |
