Design of dual-port MIMO dielectric resonator antennas with high isolation for terahertz communication

Abstract

A simple decoupling technique by using conformal metal strips is investigated for isolation enhancement of terahertz (THz) multi-input–multi-output (MIMO) dielectric resonator (DR) antennas (DRAs) in this paper. Metal strips with proper dimensions are symmetrically printed on both sides of the upper surface of DRs. The introduction of metal strips can cause disturbance to the electromagnetic (EM) fields inside the DRs by introducing the induced fields, thereby suppressing the diffusion of EM fields and rearranging the EM fields, ultimately reducing the level of coupling and enhancing the isolation between ports. Two kinds of MIMO antennas, i.e., using two DRs and sharing one DR, are used as implementation examples to verify the effectiveness of the proposed technique. Corresponding results show that by optimizing the dimensions of the metal strips reasonably, the isolation for antenna containing two DRs increased from 14.7 to 59.2 dB at 2.98 THz, while the isolation for another sharing one DR increased from 7.1 to 40 dB at 3.64 THz. Excellent improvement of isolation has been achieved through the proposed technique and the proposed MIMO antennas are expected to be applied in future THz communication.