Mutual coupling reduction in millimeter-wave MIMO dielectric resonator antenna using metamaterial polarization rotator wall

An effective technique for reducing the mutual coupling between two mm-wave ridge-gap dielectric resonator antennas (DRA) using a novel technique is investigated and presented. This is achieved by embedding a metamaterial polarization rotator (MPR) wall between the two DRAs, which are placed in the H-plane. Using the proposed MPR wall, the TE and TM modes of the antenna become orthogonal which reduces the mutual coupling between the two DRAs. The proposed MPR wall is composed of 7×2 unit cells along the E-plane. The mutual coupling is reduced between 8 to 14 dB when the proposed MPR wall is placed between the antennas. Moreover, the proposed MPR wall does not affect the antenna characteristics.