Super-directive Scattering of Optimized Multi-layered Dielectric Cylinder by Differential Evolution Algorithm

Superdirective antenna can realize high channel capacity of multiple-input multiple-output system (MIMO). The optimization of superdirective scattering by a novel weighting optimizing goal and Dirac-Delta function model is proposed. Both main-lobe and side-lobe characteristics of the lobe are optimized. Compared with the traditional optimization method, which only takes the main-lobe characteristic into consideration, the directivity has improved by 50% (from 6.0 to 9.0). Meanwhile, the radius of the scattering object is only $0.1 \lambda_{0}$, which indicates this antenna is a super-directive antenna.