In this paper, a new optimization algorithm to design shaped beam antenna is proposed. It is shown that by using offset parabolic reflector antenna and a linear array of horn antennas with one-wavelength spacing in focal point, Invasive Weed Optimization (IWO) algorithm can be used for amplitude and/or phase of source antennas to provide desired cosecant squared radiation patterns. To achieve a simple cosecant squared radiation pattern, amplitudes and phases of 11 source antennas (22 parameters) are optimized with no constraint by IWO and the results are compared with Particle Swarm Optimization (PSO) algorithm. Convergence diagram and radiation pattern results confirm the capability of IWO algorithm in shaped beam antenna design.
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