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In this paper, a broadband terahertz (THz) metamaterial absorber using asymmetric split ring resonator (ASR) was designed, fabricated, and characterized. By breaking the symmetry of a split ring resonator, two asymmetric resonances are excited from a dipole resonance, which enhance both the absorption and -factor. With the integration of four different ASRs into one unit cell, a broadband absorber...
A graphene-based archimedean spiral antenna is numerically studied. The input impedance and the radiation properties of such antenna are investigated through full-wave numerical simulations. Simulations show that the proposed structure allows frequency reconfiguration as well as appropriate radiation resistance to diminish the mismatch between antenna and photomixer. It is also shown that the total...
A dipole-like antenna made of graphene strips and integrated with a THz photonic mixer is studied numerically. The input impedance and the radiation properties of such graphene-based antenna are investigated through full-wave numerical simulations. Full-wave simulations show that the graphene-based antennas can provide higher input impedance along with the tunability of the resonance frequency; however,...
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