Ultra-wideband Absorber/reflector based on Reconfigurable Metasurface

Abstract

In this paper, we propose an ultra-wideband reconfigurable metasurface that dynamically switches the functions between absorber and reflector. To achieve ultrawideband bandwidth, a bi-layer ring-shaped metasurface equipped with PIN diodes is proposed, and the full-wave simulation and the equivalent circuit model are adopt to analyze it. When the PIN diodes are in the ON state, the switchable metasurface works as a wideband absorber with a relative bandwidth of 101%, ranging from 5.87 to 17.78 GHz.While the PIN diodes in the metasurface are in the OFF state, the reconfigurable metasurface works as a wideband reflector with a relative bandwidth of 179%, covering from 1 to 18 GHz. Additionally, the proposed structure demonstrates excellent stability with respect to different incident angles and polarizations, which has great potential in stealth applications.