Synthesis of Flat Top Power Pattern in Linear Antenna Arrays using Differential Evolution Algorithm

This work describes about the synthesis of the flat top power pattern of linear antenna array using differential evolution (DE) algorithm as an optimizing algorithm. In this work a flat top beam pattern of sharp transition (T), low Side Lobe Level (SLL) and very little ripple (R) has been achieved. To reduce the design cost of the feed network of the synthesized pattern, only the complex excitation coefficients of the elements with two states [0 or π] of their phase value are considered as the optimization parameters. To demonstrate the proposed approach a 32 element equally spaced symmetrical linear antenna array has been taken. The flat top beam width, SLL, ripple and the transition width of synthesized power pattern are obtained as 500, -35.1178 dB, 0.18dB and 40 respectively.