A polarization diversity substrate integrated waveguide fed rectangular dielectric resonator antenna

In this paper, a polarization diversity dielectric resonator antenna (DRA) is presented. In the proposed design, DRA is fed by using two narrow slots on the top wall of two adjacent substrate integrated waveguide structures, which shares a common row of metallic vias. The orientation of the slots are orthogonal to each other which generates two linear orthogonally polarized radiation pattern at same frequency to implement polarization diversity. The rectangular DRA is excited in higher order TE₁₁₃ mode in order to obtain a DRA with larger dimension at 10 GHz. The measured impedance bandwidth (S₁₁ <;-10 dB) for Port1 is 4.6% (9.34-9.78 GHz) and that for Port2 is 8.4% (9.2-10.01 GHz). Over the operating bandwidth, the measured isolation between the two ports is better that 25 dB. The antenna is radiating in broadside direction with the peak gain of 6.1 dBi at Port1(horizontal polarization) and 5 dBi at Port2 (vertical polarization). The envelope correlation coefficient (ECC) is also studied to evaluate the MIMO performance of diversity antenna. The measured result shows a good MIMO performance with envelope correlation coefficient (ECC) smaller than 0.003 over the entire spectrum.