Sideband suppression in time-modulated linear array by modified differential evolution algorithm

A novel approach based on the modified differential evolution (MDE) algorithm is proposed to suppress the sideband radiation of the time-modulated arrays (TMA). In the modified differential evolution algorithm, an adaptive adjustment strategy of parameter CR is used to improve the population diversity and to avoid frapping in local optima. Benchmark functions have been provided to verify the MDE algorithm. By optimizing the static excitation amplitudes as well as the switch-on time sequences through the MDE, the sideband level and sidelobe level of a time modulated linear array can be reduced significantly. The approach is illustrated through a 32-element linear array.