This paper presents a tunable terahertz (THz) two-port graphene patch antenna having isolationbetween the ports of the order of 40 dB over the whole range of tunability. This antenna couldeither be used in self-diplexing mode or as a multi-input–multi-output (MIMO) antenna with patterndiversity that can support simultaneous-transmit-and-receive (STAR) mode of operation with its highport-level isolation. The antenna structure through numerical analysis is optimized to provide thehighest isolation and good impedance matching. A detailed analysis of the antenna modes is carriedout to get insight into the impedance matching and radiation mechanism. An electrical equivalentcircuit is proposed for the MIMO graphene patch antenna to get a better understanding of itsoperation. Furthermore, a linear regression model is introduced to help in determination of thechemical potentials of the two graphene radiators for different frequencies of MIMO operation.
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