Monopulse Cassegrain antenna design using evolutionary algorithms

Using evolutionary programming (EP), monopulse Cassegrain antennas with four feeds can be designed for the desired sum gain, side lobe level and minimum possible antenna size. A method is proposed to achieve the optimum monopulse difference pattern. cosq(θ)cosq(θ) type feeds are considered as the feed system and the final designs have been checked using real feeds. Proper cost functions are proposed to achieve the desired gain, side lobe level and optimum slope in the difference pattern, taking into account the feasibility of the feed system. The effects of the parameters involved in the optimization are investigated.