Electromagnetic Absorbers based on Random Metasurface combined with Graphene

In this paper, a new kind of absorber with ultra-wideband microwave absorption is designed, which is combined with graphene and random metasurface. As a result, when the sheet resistance of graphene varies from $350 \Omega / \square $ to $700 \Omega / \square $, the absorption above 80% ranging from 5 to 31GHz (144% relative bandwidth) is obtained.