Thinned concentric circular array antennas synthesis using genetic algorithm

Circular antenna array has gained immense popularity in the field of communications nowadays. It has proved to be a better alternative over other types of antenna array configuration due to its all-azimuth scan capability, and a beam pattern which can be kept invariant. This paper is basically concerned with the thinning of a large multiple concentric circular array antennas of uniformly excited isotropic antennas based on Genetic Algorithm (GA). In this paper a 9 ringed Concentric Circular Array Antennas (CCAA) with central element feeding is considered. The computational results show that the number of antenna array elements can be brought down from 279 to 121 with simultaneous reduction in Side Lobe Level (SLL) of -20.78 dB with respect to -17.4 dB for uniform excitation and spacing.