A Single Feed Graphene-based Circularly Polarized Antenna for THz Applications

In this paper, a frequency reconfigurable, circularly polarized graphene-based antenna has been designed. The antenna consists of a truncated graphene patch and single series cross-aperture coupled feeding. Two orthogonal modes are generated by the sequential rotation of the electromagnetic signal on the graphene patch through the cross aperture in ground plane. The frequency reconfigurability can be achieved by varying the external dc bias voltage at the graphene patch. The proposed antenna can resonate in the broad range of frequencies from 1.22 to 1.44 THz at chemical potential from 0.5 to 1.0 eV. In this range of chemical potential, the axial ratio of the antenna is less than 3 dB. The maximum gain of antenna has been achieved up to 4.6 dBi with 62% radiation efficiency at the chemical potential of 1 eV.