Wideband RCS reduction based on metasurfaces of patterned resistive film

This study investigates a broadband radar cross-section (RCS) reduction metasurface, utilizing a gradient structure of resistive films. Since edge scattering occurs when a creeping wave propagates on a finite metal wedge, and the scattering peak of the surface wave is closely related to the incidence angle, we introduce the concept of maximum backscattering angle. By analyzing the principles of impedance matching and the propagation characteristics of creep waves on the metal surfaces, we have effectively suppressed edge scattering, particularly in the maximum backscattering angle. This design simulates the impedance mutations of different media on a metal plate, significantly achieving 37.8 dB RCS reduction at 3 GHz and obtaining an average RCS reduction of over 16 dB between 2 – 18 GHz.