Ultra-Wideband Dual-Polarization Absorber/Reflector Based on Reconfigurable Metasurface

Abstract

This paper introduces an ultra-wideband dual-polarization absorber/reflector based on reconfigurable metasurface loaded with PIN diodes, where the metasurface is performed as a wideband absorber or reflector with ON and OFF state diodes. The proposed structure consists of the top active metasurface layer, one patterned resistive films, and a simple bias network layer. The top layer of the active metasurface achieves absorption and reflection of high-frequency electromagnetic waves, while the bottom layer of the metasurface achieves absorption of low-frequency electromagnetic waves. When combined, they enable ultra-wideband absorption/reflection. The PIN diodes loaded on the active metasurface are controlled by a bias network on the back of the dielectric substrate. While switched to the absorber mode, it achieves more than 80% absorptivity ranging from 2.3 to 25 GHz, corresponding to a fractional bandwidth of 166 ^% .Under the reflection state, a reflectivity of greater than 50% is achieved over a frequency band ranging from 7.6 to 15.8 GHz with a relative bandwidth of 70%. Additionally, the proposed structure demonstrates excellent stability with respect to different incident angles and polarizations.