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Proceedings Paper

Application of evolutionary algorithms and neural network concepts to the design of low-cost, wideband antenna arrays
Author(s): Scott G. Santarelli; Robert J. Mailloux; Tian-Li Yu; Thomas M. Roberts; Michelle H. Champion; David E. Goldberg
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Paper Abstract

This paper describes the application of biologically-inspired algorithms and concepts to the design of wideband antenna arrays. In particular, we address two specific design problems. The first involves the design of a constrained-feed network for a Rotman-lens beamformer. We implemented two evolutionary optimization (EO) approaches, namely a simple genetic algorithm (SGA) and a competent genetic algorithm. We conducted simulations based on experimental data, which effectively demonstrate that the competent GA outperforms the SGA (i.e., finds a better design solution) as the objective function becomes less specific and more "general." The second design problem involves the implementation of polyomino-shaped subarrays for sidelobe suppression of large, wideband planar arrays. We use a modified screen-saver code to generate random polyomino tilings. A separate code assigns array values to each element of the tiling (i.e., amplitude, phase, time delay, etc.) and computes the corresponding far-field radiation pattern. In order to conduct a statistical analysis of pattern characteristics vs. tiling geometry, we needed a way to measure the "similarity" between two arbitrary tilings to ensure that our sampling of the tiling space was somewhat uniformly distributed. We ultimately borrowed a concept from neural network theory, which we refer to as the "dot-product metric," to effectively categorize tilings based on their degree of similarity.

Paper Details

Date Published: 2 May 2007
PDF: 11 pages
Proc. SPIE 6563, Evolutionary and Bio-inspired Computation: Theory and Applications, 65630G (2 May 2007); doi: 10.1117/12.724968
Show Author Affiliations
Scott G. Santarelli, Air Force Research Lab. (United States)
Robert J. Mailloux, Univ. of Massachusetts (United States)
Tian-Li Yu, Univ. of Illinois at Urbana-Champaign (United States)
Thomas M. Roberts, Air Force Research Lab. (United States)
Michelle H. Champion, Air Force Research Lab. (United States)
David E. Goldberg, Univ. of Illinois at Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 6563:
Evolutionary and Bio-inspired Computation: Theory and Applications
Misty Blowers; Alex F. Sisti, Editor(s)

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