Terahertz Broadband RCS Reduction Enhancement by Polarization Coding Metasurface

In this paper, a broadband and high-efficiency RCS reduction enhancement by employing a polarization-conversion coding metasurface is demonstrated in the terahertz region. A symmetric linearly polarized conversion metasurface with a relative bandwidth of 74% and a polarization conversion ratio (PCR) over 90% from 0.24 THz to 0.52 THz is designed as the 1-bit coding block. By applying the Golay-Rudin-Shapiro (GRS) polynomials on the coding series, a highly effective RCS reduction paradigm averaged below -20 dB has been achieved with a cross-polarization enhancement. Compared to the co-polarized counterpart, a -10 dB enhancement is attained by the cross-polarized coding array. It paves a promising path to terahertz RCS reduction and polarized wave regulation.