A Novel Wideband Low-RCS Reflector by Hexagon Polarization Rotation Surfaces

In this paper, a novel wideband Low-Radar Cross Section (RCS) reflector is proposed. It consists of metallic hexagonal patches on the top layer of dielectric substrate and a metallic film on the bottom. The patches are consists of different sizes of hexagonal patch arrays. They are corresponding to different resonance frequencies, respectively. And the wideband polarization rotation is achieved. A 180°-phase difference is created by the Polarization Rotation Surfaces (PRS) using chessboard-like geometry, which introduced 90° and -90° phase-shift, respectively. The scattering energy is redirected into off-normal directions by the PRS, which enables the effective RCS reduction. In order to obtain more RCS reduction, the arrangement of the PRS reflector has been optimized. The results show that, more RCS reduction can be achieved by the improved arrangement. The monostatic RCS of the reflector can be reduced more than 20 dB by this method.