This works describes the design of a highly isolated wideband two-element semi-circular shaped patch with rectangular dielectric resonator antenna (RDRA). The antenna is operated at (24GHz - 40 GHz) that covers Ka-band (27 GHz -40GHz). Dielectric resonator antenna (DRA) is positioned perpendicular to one another in order to accomplish the desired wide-band functioning with good impedance matching, increased gain, and bandwidth. To improve the isolation between antenna elements, diamond shape slot is etched in the ground plane. The DRA configuration provides a higher gain of approximately 7.8 dB and nearly omnidirectional radiation patterns. In addition, the recommended DRA MIMO performance parameters are examined and reported. The results indicate that the suggested DRA MIMO antenna is considered a suitable contender for 5G millimeter wave-based applications.