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Progress In Electromagnetics Research C
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DESIGN OF FULLY DIGITAL CONTROLLED RECONFIGURABLE DUAL-BEAM CONCENTRIC RING ARRAY ANTENNA USING GRAVITATIONAL SEARCH ALGORITHM

By A. Chatterjee, G. K. Mahanti, and P. R. S. Mahapatra

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Abstract:
In this paper, we propose an optimization method based on Gravitational Search Algorithm (GSA) for design of reconfigurable dual-beam concentric ring array of isotropic elements with phase only control of five-bit digital phase shifters. The problem is to find a common radial amplitude distribution using four-bit digital attenuator that will generate three different types of broadsided beam pair in vertical plane: a pencil/pencil beam pair, a pencil/flat-top beam pair and a flat-top/flat-top beam pair sector pattern) with desired value of side lobe level, first null beam width and ripple. The two patterns differ only in radial discrete phase distribution while sharing a common discrete radial amplitude distribution. The optimum sets of four-bit discrete radial amplitude distribution generated by four-bit digital attenuators and five-bit discrete radial phase distribution generated by five-bit digital phase shifters for obtaining dual radiation patterns are computed by Gravitational Search Algorithm.

Citation:
A. Chatterjee, G. K. Mahanti, and P. R. S. Mahapatra, "Design of Fully Digital Controlled Reconfigurable Dual-Beam Concentric Ring Array Antenna Using Gravitational Search Algorithm," Progress In Electromagnetics Research C, Vol. 18, 59-72, 2011.
doi:10.2528/PIERC10101806
http://www.jpier.org/pierc/pier.php?paper=10101806

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