Dual-band high impedance surface with graphene-based metasurfaces

High impedance surface (HIS) is an electromagnetic band gap (EBG) material that shows magnetic conductor surface properties within its band gap frequencies. The operation bandwidth is corresponding to the frequency range, where the reflection phase varies between +90∘ and −90∘. In this paper, a dual-band HIS is investigated based on planar periodic graphene arrays placed on a grounded dielectric substrate. Analytical circuit model of the graphene array together with the transmission line theory is employed to analyze the proposed structure. We demonstrate that the HIS bands can be adjusted by tuning the geometrical parameters of the structure and the Fermi level of graphene. The graphene-based HIS promises future applications in the low-profile, high gain and high efficiency antennas at THz frequencies.