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Gravitational search algorithm for synthesis of selectively thinned concentric ring array antenna with minimum sidelobe level and with fixed and variable first null beamwidth

Published online by Cambridge University Press:  10 September 2014

Anirban Chatterjee ,
Gautam Kumar Mahanti  and
Narendra Nath Pathak
Anirban Chatterjee
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Goa, Farmagudi, Ponda, India
Gautam Kumar Mahanti*
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Durgapur, Durgapur, India
Narendra Nath Pathak
Affiliation:
Department of Electronics and Communication Engineering, Dr. B.C.Roy Engineering College Durgapur, Durgapur, India
*
Corresponding author: G.K. Mahanti Email: [email protected]
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Abstract

Thinning a large concentric ring array by an evolutionary algorithm needs to handle a large amount of variables. The computational time to find out the optimum elements set increases with the increase of array size. Moreover, thinning significantly reduces the directivity of the array. In this paper, the authors propose a pattern synthesis method to reduce the peak sidelobe level (peak SLL) while keeping first null beamwidth (FNBW) of the array fixed by thinning the outermost rings of the array based on Gravitational Search Algorithm (GSA). Two different cases have been studied. In the first case only the outermost ring of the array is thinned and in the second case the two outermost rings are thinned. The FNBW of the optimized array is kept equal to or less than that of a fully populated, uniformly excited and 0.5 λ spaced concentric ring array of same number of elements and rings. The directivity of the optimized array for the above two cases are compared with an array optimized by thinning all the rings, while keeping the design criteria same as the above two cases. The optimized array by thinning the outermost rings gives higher directivity over the optimized array by thinning all the rings. Time required for computing the optimum elements state for the above two cases using GSA are shown lesser compared to the optimized array by thinning all the rings using the same algorithm. The peak SLL and the FNBW of the optimized array for the above two cases are also compared with the optimized array by thinning all the rings.

Keywords

Concentric ring arrayDirectivityFirst null beamwidthGravitational Search AlgorithmPeak SLLThinning
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Issue 6 , December 2015 , pp. 775 - 781
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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