Broadband diffuse scattering metasurface with units of randomly distributed sizes

In this paper we presented a diffuse scattering metasurface with cross-shaped units of randomly chosen sizes. The main energy of the incident wave is scattered to many different directions of the upper half space through the metasurface, resulting in the reduction of backward radar cross section (RCS). We designed a two-layered metasurface consisting of a top layer of metal patches and a flexible polyimide substrate. Owing to the good flexibility of polyimide, this structure can be easily attached to metal screen of curved shapes. After optimization, the simulation results show that the proposed metasurface can reduce the backward RCS by about 10 dB over the whole X band.