SMART GRAPHENE-BASED FREQUENCY SELECTIVE SURFACE DESIGNED TO ACT AS SINGLE OR DUAL BAND DEVICE WITH RECONFIGURABLE OPERATION BANDS
Keywords:FDTD Method, Graphene, Matrix Exponential Method, Smart FSS
In this paper, a finite-difference time-domain (FDTD) formulation, based on the exponential matrix and on thin material sheet methods is developed for modeling subcellular thin graphene sheets. This formulation is validated by reproducing graphene frequency selective surfaces (FSS) known from literature. Then, we propose in this work a smart graphene FSS device. Smartness is obtained by means of a unity cell formed by a graphene ring with a graphene sheet placed in its aperture. By properly regulating the chemical potentials of the graphene elements, two frequency-tunable modus operandi are obtained: single- or dual-band rejection modes. When the device operates in its dual-band rejection mode, either of the rejection bands can be shifted individually in the frequency spectrum. Additionally, both rejection bands can also be reconfigured simultaneously.
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