Design and simulation of a metamaterial polarization-rotator wall for isolation improvement in SIW fed MIMO DRA for D-band applications

In this research, a metamaterial polarization-rotator (MTMPR) wall is proposed for mutual coupling reduction in a 2×2 multiple-input multiple-output (MIMO) antenna. A substrate integrated waveguide (SIW) based dielectric resonator antenna (DRA) is the preferred topology for the D-band frequency antenna design. The antenna elements are closely packed to achieve high antenna integration. The effect of the proposed isolation technique on the bandwidth performance and radiation characteristics of the antenna is investigated. Simulation results show that the proposed antenna exhibits a −10 dB impedance bandwidth of 19.5% (136.68 GHz–166.28 GHz), a gain of 11.06 dBi and a high efficiency of 84%. The antenna radiates in the broadside direction, with an isolation performance greater than 21.16 dB across the entire bandwidth of operation. Diversity metrics are also evaluated, indicating low correlation between the antenna elements and suitability of the proposed design for MIMO applications.