Large Range Frequency-Tunable Transparent Absorber Based on Patterned Graphene

In this paper, the authors design a microwave absorber with an electrically tunable absorption frequency based on a patterned graphene sandwich structure. The surface resistance of graphene was tuned by adjusting the bias voltage applied on the patterned graphene sheet. Three-dimensional full-wave simulation results show that the central absorption frequency of the absorber can be continuously tuned from 7.3 GHz to 12.3 GHz, the tunable range as wide as 5 GHz, and the peak absorption rate is greater than 90% in the entire tunable range. In addition, it has high optical transparency. Therefore, the proposed absorber has application prospects in the field of electromagnetic protection and stealth.