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POWER DENSITY MODES FOR DETERMINING ELECTROMAGNETIC
SOURCE FIELDS
by
Alan Rowland Keith
——————————————————————————————————–
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
May 2008
Copyright 2008 Alan Rowland Keith
Object Description
| Title | Power density modes for determining electromagnetic source fields |
| Author | Keith, Alan Rowland |
| Author email | alan.r.keith@boeing.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2005-10-10 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-02-19 |
| Advisor (committee chair) | Aluizio, Jr., Prata |
| Advisor (committee member) |
Katsouleas, Thomas Steier, William |
| Abstract | Antenna designs for desired far-zone power distributions are challenged by the fact that phase information for the distribution is not known. Many techniques which are used to synthesize antenna excitations assume a constant phase or produce a phase from an initial starting solution. These techniques then proceed with iteration upon the source fields until the computed fields satisfy criteria based on the desired power distribution. However, for complex antenna beam shapes, the solution from these methods could be facilitated by knowledge of the phase characteristics of the far-zone distribution. This work demonstrates a technique of deriving the phase distribution from the desired or given power density. The power density is decomposed into power density modes which are derived from a Poynting Vector computation expressed in terms of complex spherical wave modes. By incorporating the source size constraints, the power density modal expansion can be truncated based on a cut-off property from the foundation of the spherical wave modes. Once the power density is expressed in terms of these modes, an algorithm which reconstructs the fields from the power density modes can be utilized. For the minimum number of modes, the phase distribution is shown to have a very limited number of solutions which in most cases results in only two phase distributions. |
| Keyword | phase recovery; spherical wave expansion; antenna efficiency |
| 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 |
| Type | texts |
| Legacy record ID | usctheses-m1022 |
| Rights | Keith, Alan Rowland |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Keith-20080219 |
| Archival file | uscthesesreloadpub_Volume44/etd-Keith-20080219.pdf |
Description
| Title | Page 1 |
| Full text | POWER DENSITY MODES FOR DETERMINING ELECTROMAGNETIC SOURCE FIELDS by Alan Rowland Keith ——————————————————————————————————– A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) May 2008 Copyright 2008 Alan Rowland Keith |
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