Reconfigurable Surface Design for Electromagnetic Wave Control

A reconfigurable surface, for electromagnetic (EM) wave manipulation, utilizing frequency selective unit-cells integrated with PIN diodes are introduced. By digitally controlling the reconfigurable surface, several functionalities such as focusing, linear polarization conversion and scattering are obtained on the same surface. For the scattering purposes, three arrangement methods of alternative periodic columns, chessboard-like structure and coding surface optimized by GSO algorithm are analyzed. For the coded surface, 10-dB RCS reduction from 15.5 GHz to 22.5 GHz is obtained with a bandwidth of 37%. All the results show that the introduced reconfigurable surface has more potential for future applications.