RCS Reduction of Slot Antenna Array Using Coding Metasurfaces

In this paper, a diffusive frequency selective radome, which has two diffusion bands, is proposed. The integrated structure is comprised of three layers. An
$8\times 8$
antenna array is designed as the bottom layer, which acts as a reflecting ground for the upper two layers. In order to maintain the radiation characteristics of the antenna, different 1-bit coding metasurfaces are designed for the dual-band radar cross section (RCS) reduction based on polarization conversion. The antenna gain loss less than 0.5 dB and two low-RCS bands from 3.9 to 6.1 GHz and 11.5 to 15 GHz are observed under the normal incidence.