Abstract
ABSTRACTIn this paper, a novel method is presented to increase microwave absorbers bandwidth. The proposed method is based on coupling resonators which consist of a graphene layer at the top, a dielectric spacer and a metallic plate in the bottom. The first resonance frequency of every resonator is calculated by the thickness and relative permittivity of the substrate and the next harmonics are odd coefficients of the first resonance. Absorption rate growth is based on the electric field reinforcement in the graphene plane via tuning graphene Fermi energy. Finally, after combining the resonators and by considering reflection amplitude lower than −10 dB, a bandwidth of 11.9 GHz is obtained from 5.3 to 17.2 GHz for Fermi energy equal to zero. Low-profile and wideband absorption of the proposed structure can be effectively used in radar cross-section applications.
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