Reflective 1-bit Coding Metasurface for Frequency Selective RCS Reduction

In this paper, we have designed and fabricated a reflective type 1-bit coding metasurface, which can be used forefciently reducing the backward radar cross section with frequency selective characteristic. Different from conventional diffusion-like metasurfaces, the proposed metasurface only diffuse the scattering wave outside the working frequency band, while at the working frequency it behaves as a mirror surface with specular refection property. Both simulated and experimental results validate that the proposed metasurface has a RCS reduction effect more than 10 dB from 9 GHz to 13.6 GHz and 17 GHz to 20 GHz, while a specular reflection around 15 GHz.