Today, there is a deep interest in antenna systems which operate frequencies in the millimeter-wave region 100-300GHz. Conventional metallic antennas suffer problems with regard to power losses, radiated power capabilities and fabrication difficulties. These obstacles can be overcome if a simply shaped antenna with few conducting surfaces is designed. The dielectric resonator antenna meets this requirement and has been shown to be a good choice for use in this band. A new four-element cylindrical dielectric resonator antenna with top loaded thin circular disc is designed to improve the bandwidth of MIMO systems.