Ultra-Wideband RCS Reduction Based on Chessboard Surface and Active FSS

An ultra-wideband radar cross section (RCS) reduction technique based on phase interference cancellation and tunable absorption is proposed. The specific structure consists of a chessboard surface and an active frequency selective surface (AFSS) absorber. The chessboard on the top layer is constructed of square loop and circular patch unit cells, which can realize a destructive phase interference performance in higher frequency, while the bottom AFSS absorber achieves a tunable absorption in lower frequency range. Full-wave simulation results indicate that the designed combined structure can obtain a controllable ultrawideband RCS reduction more than 10 dB from 4.4 to 36.5 GHz, compared to metallic plate with the same dimension.