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In this paper, a two port circularly polarized (CP) MIMO Cylindrical Dielectric Resonator Antenna (CDRA) with Quad-band response is designed for terahertz (THz) applications. This antenna is new since MIMO DRA antennas in the THz frequency range have never been described before. Also, by the varying graphene potential of the antenna, isolation between the two antennas is increased and CP tuning can be achieved which is another unique feature of this proposed antenna at THz region. The proposed DRA generates two higher order modes (HEM 11δ  and HEM 12δ ). The 3 dB Axial Ratio Bandwidth (ARBW) of 8.22, 2.48, 3.67 and 5.67% is achieved at four resonant frequencies. Various MIMO performance parameters are evaluated and these parameters are within acceptable limits. Advantages of the proposed design are quad response, higher order modes generation, CP tuning and good isolation between the ports. The tunability of graphene material allows it to provide CP responses in the frequency region that is most useful in biomedical applications. The use of a CP antenna in a THz biomedical application can improve system sensitivity by reducing polarisation losses and aligning them. All these features make the proposed MIMO DRA potentially suitable for THz applications.

HEM 11δ and HEM 12δ -based Quad band Quad Sense Circularly Polarized tunable Graphene-based MIMO Dielectric Resonator Antenna