Ultra-broadband absorber based on multilayered graphene

We propose an absorber with ultra-broadband and independent polarization. The bandwidth of the absorber is widened by increasing the number of layers of patterned graphene and also decreased the sensitivity of structure on incident wave polarization. Full wave simulation is demonstrated from 5 GHz to 197 GHz (extraordinary relative bandwidth 190%) the absorption is obtained above 90%. The equivalent circuit model is used for obtaining the input admittance of the proposed absorber. By adjusting the input admittance in a wide frequency range, matching is obtained. The destructive interference and multiple resonances approach is used in designing the absorber. The polarization effect of incident waves on absorption and bandwidth is studied. The parametric study is accomplished by analyzing the absorber's performance and optimizing the structure. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement