▎ 摘　　要

Demand for an antenna with high gain and directivity for medical sensing is necessary so the Vivaldi antenna in the THz spectrum with reconfigurable characteristics is a proper solution. Antenna design with a higher gain and bandwidth can be a remarkable choice for THz sensing. Thus, in this work, a Vivaldi antenna is developed for 0.5 to 2 THz with more than 120% bandwidth. To obtain the reconfigurable characteristics, the graphene slabs can be used for this type of antenna to improve the bandwidth when the chemical potential is changed from 0.1 to 0.7 eV. Using the graphene slabs can affect both the gain and return loss of the antenna. Therefore, to modify the return loss, the graphene plasmonic nano-ribbons are used and silicon slabs are improvised between the graphene to reduce its drawback by providing a hyperbolic metamaterial lens. The hyperbolic metamaterial lens can concentrate the electric field to compensate for the graphene loss. The final antenna gain is increased up to 11.5 dBi, which makes it attractive for biosensing. This antenna is used for recognizing the cancerous and healthy skin tissue in the THz spectrum.