A New Coding Metasurface for Wideband RCS Reduction

Abstract

In this paper, two novel artificial magnetic conductors (AMC) structures are designed to realize 180 degrees of phase difference in a wideband frequency. These two AMC structures are encoded as unit “0”and unit “1”, respectively. By using Simulated Annealing algorithm, the coding sequences of the coding metasurface can be designed, so that the radar cross section (RCS) reduction can be realized as well. Compared with the metallic surface, the simulation and measurement results of this presented coding metasurface indicate that this coding metasurface can significantly realize RCS reduction under normally incident electromagnetic (EM) waves from 7GHz to 20GHz, which is 96.3%, and the RCS under obliquely incident waves also can be dramatically reduced as well, furthermore, the RCS reduction of this coding metasurface is better than that of traditional chessboard surface.