High-Performance Graphene Patch Antenna with Superstrate Cover for Terahertz Band Application

Graphene-based patch antennas are rapidly gaining interests in communication technologies for high-speed data transmission due to the exciting properties of graphene material. Herein, we designed a high-performance circular patch antenna for terahertz band application with graphene as the radiating patch. For the protection of patch against environmental jeopardies and enhancement of antenna performance, a thin layer of Teflon (epsilon(r) = 2.1) as superstrate is used, and overall antenna performance is evaluated. The designed antenna operates around 7 THz with amazing S(11)of - 75.66 dB and VSWR of 1.0003. The designed antenna is highly efficient with radiation efficiency of 97.21% and a very high gain of 7.286 dB. The designed antenna is also analysed for different dielectric materials used as the covering superstrate layer. Where the introduction of higher dielectric constant materials as superstrate layer increases the antenna gain significantly, it also reduces the bandwidth and efficiency of the designed antenna at terahertz band. An antenna gain of 7.392 dB is achieved for glass (epsilon(r) = 4.82) as superstrate material.