Mutual Coupling Reduction in Circularly Polarized Dielectric Resonator MIMO Antenna Arrays Using Slot

Abstract

An effective technique for reducing the mutual coupling between cylindrical dielectric resonator antennas (CDRA’s) by using a Slot. This is achieved by separating the two closely spaced CDRA’s antennas at the optimum distance (λ/4) and creating a slot between DRA’s. Both CRDA's are placed in E-Plane. Using the proposed techniques, a new current path is introduced which in result not only reduces the mutual coupling between the two CDRA’s but also produce the circular polarization. The proposed technique reduced the mutual coupling (MC) ~ 12 dB throughout the entire band of interest. Average Gain of ~ 5.9 dBi is attained throughout. Return loss of ~12.16dB Moreover, 3-dB axial ratio bandwidth of 12.5% is achieved. The design is simulated in professional simulating tool i.e. CST, which use FET (finite integration technique) computational technique that is further validated through another computational technique FEM (Finite element method) and significant resemblance in results is examined.