Synthesis of a thinned planar antenna array with suppressed peak side lobe level using modified binary coded genetic algorithm (MBC-GA)

Abstract

In this paper, we propose a novel design for the synthesis of a thinned planar antenna (TPA) array that produces a radiation pattern with maximum suppression in peak side lobe level (SLL). The main objective of this paper is to obtain Peak side lobe level (PSLL), equal to or less than - 25dB for uniformly excited antenna elements across the aperture. A Modified Binary Coded GA (MBC-GA) is utilized to find out optimum combination 'ON' and 'OFF' elements by randomly turning on and turning off elements in certain position to obtain the maximum peak side lobe level (PSLL). A novel Crossover and mutation techniques are devised and incorporated in normal BCGA to develop the MBC-GA. In order to validate the effectiveness of proposed method, a 12x12 TPA is considered in present study. Their computed performance is compared with the already proposed literature containing designs of similar size arrays. Comparison shows the superiority of our technique and also indicates acknowledgeable improvements in reduction of peak side lobe levels at bore sight.