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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 625437, 5 pages
http://dx.doi.org/10.1155/2012/625437
Research Article

Optimization of Concentric Ring Array Geometry for 3D Beam Scanning

National Key Laboratory of Antennas and Microwave Technology, Xidian University, P.O. Box 377, Shaanxi, Xi'an 710071, China

Received 16 January 2012; Revised 29 February 2012; Accepted 3 March 2012

Academic Editor: Zhongxiang Q. Shen

Copyright © 2012 Li Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Optimization of the element placement in a concentric ring array for three-dimensional (3D) beam scanning with minimum peak sidelobe levels (SLLs) is addressed in this paper. In order to achieve 3D beam scanning with the lowest peak SLL, both the radius and the element spacing of each ring are optimized. Moreover, the aperture size is a very important constraint for the array, since there is an upper limit for the aperture size of a given array in real-life environment. Hence, in our optimization design, the maximum radius of the concentric ring array is constrained. Through the optimization, the peak SLL of the optimal concentric ring array is about 6 dB lower than that of the uniform concentric ring array, but the directivity is reduced by only 0.3 dB.