▎ 摘　　要

In this article, an optimized, highly efficient, wideband 1 x 2 Multiple-Input-Multiple-Output (MIMO) fractal antenna is designed for high-speed short-range communication, video rate imaging, medical imaging, and explosive detection in the terahertz frequency band. The suggested fractal THz MIMO antenna configuration is originated from basic rectangular patch antenna through several design iteration steps with partial ground plane structure. A polyimide substrate of thickness 45 mu m and dielectric constant of epsilon(r) = 3.5 is utilized for designing the proposed fractal antenna. The performance of the proposed antenna is enhanced using particle swarm optimization (PSO) technique. The required antenna characteristic parameters like radiation pattern, reflection and transmission coefficient, gain, efficiency, directivity and diversity parameters like channel capacity, envelope correlation coefficient, total active reflection coefficient and mean effective gain are computed using computer simulation software (CST). The effect of chemical potential (mu(c)) of the graphene material is also analyzed and discussed. The designed MIMO antenna covers a wider impedance bandwidth of 400 GHz (0.35-0.75 THz) with coaxial feeding. For the designed MIMO, the patch elements maintain isolation of