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Proceedings Paper

Simulation and optimization of a smart reconfigurable aperture antenna
Author(s): Gregory N. Washington; Hwan-Sik Yoon; Wilhelmus H. Theunissen
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Paper Abstract

The work in this study develops the framework for placement and actuation of novel mechanically reconfigurable dual-offset contour beam reflector antennas (DCBRA). Towards that end the methodology for the antennas' design is defined. The antenna designed in this study employs piezoelectrically driven ball screw actuators. These actuators are attached to a flexible sub reflector surface and are used to vary radiation pattern. In addition, two separate optimization problems are stated and solved: Actuator position optimization and actuation value optimization. For the former, a method termed as Greatest Error Suppression method is proposed where the position of each actuator is decided one by one after each evaluation of the error between the desired subreflector shape and the actual subreflector shape. For the second problem, a mathematical analysis shows that there exists only one optimal configuration. Two optimization techniques are used for the second problem: the Simulated Annealing algorithm and a simple univariate optimization technique. The univariate technique always generates the same optimal configuration for different initial configurations and it gives the low bound in the evaluation of the error. The Simulated Annealing algorithm is a stochastic technique used to search for global optimum point. Finally, as an example, the results of the proposed optimization techniques are presented for the generation of a subreflector shape for the geographical outline of Brazil.

Paper Details

Date Published: 11 July 2002
PDF: 12 pages
Proc. SPIE 4700, Smart Structures and Materials 2002: Smart Electronics, MEMS, and Nanotechnology, (11 July 2002); doi: 10.1117/12.475034
Show Author Affiliations
Gregory N. Washington, The Ohio State Univ. (United States)
Hwan-Sik Yoon, The Ohio State Univ. (United States)
Wilhelmus H. Theunissen, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 4700:
Smart Structures and Materials 2002: Smart Electronics, MEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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