Tapered Periodic Sheet Design for Edge Scattering Suppression

In this paper, a Tapered Periodic Sheet (TPS) loaded on the metal edge is proposed to reduce the oblique incidence monostatic Radar Cross Section (RCS) of the metal plate. The TPS uses a uniform resistance sheet with fixed square resistance, a pattern period taper design is introduced to achieve a smooth transition of surface impedance, the surface current is smoothly tapered to zero from the metal edge to the air, and the edge diffraction field of metal edge is suppressed. The designed TPS is loaded horizontally along the edge of metal plate with a length of 96mm, which thickness closes to zero. The simulation results show that a dual-polarization more than 10dB monostatic RCS reduction effect of 1-12GHz (fractional bandwidth 169.2%) in a wide angle range of inclined incidence is achieved. The proposed TPS has excellent edge scattering suppression effect and can be widely used in RCS reduction design of actual radar stealth platform.