Modeling and synthesis of circular‐sectoral arrays of log‐periodic antennas using multilevel fast multipole algorithm and genetic algorithms

Date
2007-06-17
Advisor
Instructor
Source Title
Radio Science
Print ISSN
0048-6604
Electronic ISSN
1944-799X
Publisher
Wiley-Blackwell Publishing, Inc.
Volume
42
Issue
3
Pages
RS3018-10 - RS3018-1
Language
English
Type
Article
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Abstract

Circular‐sectoral arrays of log‐periodic (LP) antennas are presented for frequency‐independent operation and beam‐steering capability. Specifically, nonplanar trapezoidal tooth LP antennas are considered in a circular array configuration, where closely spaced antennas occupy a sector of the circle. Electromagnetic interactions of the array elements, each of which is a complicated LP antenna structure, are rigorously computed with the multilevel fast multipole algorithm (MLFMA). Genetic algorithms (GAs) are also employed in combination with MLFMA for synthesis and design purposes. By optimizing the excitations of the array elements via GAs, beam‐steering ability is achieved in addition to the broadband (nearly frequency‐independent) characteristics of the designed arrays. Computational results are presented to demonstrate the important properties of LP arrays.

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Published Version (Please cite this version)