Multiobjective Optimization Using Modified Binary PSO for Reduction of Sidelobe Level of the Thinned Array Antenna

Abstract

To design an efficient communication system, controlling the energy present in the side lobes of the far-field pattern is essential with a considered antenna array. This paper discussed one method for synthesizing a thin antenna array for optimizing three objectives simultaneously. They are several active elements, peak SLL and FNBW. All these objectives are in contrast in nature. This multi-objective technique furnishes appreciable flexibility for any specified application. A planar array antenna of 20X10 and 10X10 is synthesized using modified BPSO and in the position updating equation, a modified sigmoid function is used, including spread distance. Numerical results state that MBPSO performs well, and the array antenna of 20X10 with 54% filled aperture (108 elements) produces maximum PSLL and FNBW of -19.28dB and 280 in the remaining ∅ plane, respectively. The pattern representation in the far-field at three cutting planes with low PSLL’s of -20dB.Whereas 10X10 planar array antenna with 52% thinning percentage produces the best PSLL of -22.04 dB and -23.44 dB in ∅=00 & 900principal planes, respectively. The FNBW has observed in two planes is around 310. And also achieved a compromised solution of PSLL and FNBW of -19.28 dB and 270, respectively.