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LOW SIDELOBE COSECANT-SQUARED PATTERN SYNTHESIS FOR LARGE PLANAR ARRAY USING GENETIC ALGORITHM

By T. Sallam and A. M. Attiya

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Abstract:
A cosecant-squared radiation pattern synthesis for a planar antenna array by using the genetic algorithm (GA) is presented. GA makes array synthesis flexible to achieve two desired features, namely, low peak side lobe level (PSLL) and small deviation (ripples) in the shaped beam region. In order to obtain a desired csc2 pattern with the PSLL constrained, GA optimizes both the excitation amplitude and phase weights of the array elements. Dynamic range ratio (DRR) of the excitation amplitudes is improved by eliminating the weakly excited array elements from the optimized array without distorting the obtained pattern. To illustrate the effectiveness and advantages of GA, the beam pattern with specified characteristics is obtained for the same array by using particle swarm optimization (PSO). Results show that the performances of GA and PSO are comparable when dealing with small-to-moderate planar antenna arrays. However, GA significantly outperforms PSO on large arrays. Moreover, numerical results reveal that GA is superior to PSO in terms of cost function evaluation and statistical tests.

Citation:
T. Sallam and A. M. Attiya, "Low Sidelobe Cosecant-Squared Pattern Synthesis for Large Planar Array Using Genetic Algorithm," Progress In Electromagnetics Research M, Vol. 93, 23-34, 2020.
doi:10.2528/PIERM20042005

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