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In this paper, we analytically design a simple configuration of a broadbandTHz and polarization-insensitive absorber. The mentioned absorber consists oftwo layers of graphene disks, and the transmission line model is considered forthe whole of the proposed absorber's structure to design it accurately.Therefore, the input admittance of the designed absorber is obtained by thetransmission line model. Also, the real part of the input admittance isapproximately tuned to be matched to the free space admittance. In contrast,the imaginary part of it is closely adjusted to zero around the centralfrequency of the THz absorber. Using only just two layers of Periodic Arrays ofGraphene Disks (PAGDs) with one kind of dielectric as the material ofsubstrates, it causes that the absorption of the structure can be achievedhigher than 90% by the Finite Element Method (FEM). Normalized bandwidth hasreached up to 75.4% in 5 THz as the central frequency of the device. As thenext step, we use the CST studio software to validate our designed absorber,and it will show that the numerical results will have the best matching withthe analytical method.

Design of a Broadband and Polarization Insensitive THz Absorber Based on Two Layers of Periodic Arrays of Graphene Disks