Reduced side lobe level of sparse linear antenna array by optimized spacing and excitation amplitude using particle swarm optimization

Sparse antenna array has many advantages like low mutual coupling, directive beam and cost effective because of less number of elements as compare to equally spaced antenna array. While the main limitation in this array is of high side lobe levels because of different inter element spacing. In this paper optimized values of elements spacing and excitation amplitude for sparse linear antenna array are achieved to minimize the peak side lobe level using particle swarm optimization (PSO) with better convergence rate. Random values of spacing are considered in half and one wave length range. And maintained the main beam direction.