Transparent Wideband Absorber Based on Narrow Pattern

This paper presents an optical transparent wide band absorber. The absorber consists of three parts. The top layer is made of a very narrow grooved metal square ring, the middle layer is made of a transparent dielectric substrate, and the bottom layer is made of a hexagonal metal grid structure. The simulation results show that the absorber performs well in the range of 8.0GHz to 20.5GHz, and the absorptivity is more than 90%. In addition, the absorber adopts a centrally symmetric structure, which is insensitive to polarization angle and maintains a high absorption rate at oblique incidence.