Mutual coupling reduction in wideband dielectric resonator antennas

Abstract

An effective method for reducing the mutual coupling between wideband dielectric resonator (DR) antennas (DRAs) is proposed by covering the metal on the middle dielectric bridge, the contralateral sides and contralateral upper edges of the DRs. This metal decoupling structure can make the coupled electric fields in the adjacent DR be perpendicular to the electric fields of the excited DR, which produce wideband and high isolation between two adjacent DRAs. Thus, the gain of DRA can be restored. For the structural characteristics, the dielectric bridges can connect the decoupling structure and the dielectric blocks of DRAs with high dielectric constant together on the same substrate by PCB process. Finally, the isolation level of the proposed DRAs can be enhanced from 15.5 to 32.3 dB over the effective frequency range from 10.22 to 13.37 GHz or 26.7%.