2-Port High Gain Millimeter-wave MIMO Antenna for 5G Applications

In order to improve the distance of 5th Generation (5G) Mobile Communication Technology) millimeter-wave outdoor point-to-point relay transmission, a 2-port Multiple Input Multiple Output (MIMO) antenna with high gain and low sidelobe level characteristics is designed at 39 GHz. The antenna is designed using the Taylor synthesis method and slotting technology to increase the antenna gain and lower the sidelobe level. Loading hollow T-shaped branches reduces the mutual coupling between MIMO antennas. The measured results are basically in line with the simulation ones. The results show that the bandwidth of the antenna is 38.1 ~ 39.3 GHz; the isolation degree is more than 50dB; the antenna gain is 25.75 dBi at 39 GHz; the E-plane and H-plane sidelobe levels are -20.5dB and -20 dB, respectively. Furthermore, the Envelope Correlation Coefficient (ECC) is less than 0.022; the Diversity Gain (DG) is more than 9.89; and the radiation efficiency reaches 90% in the working frequency band. Therefore, this antenna can be used as a long-distance relay antenna in 5G millimeter-wave communication system with high gain and low sidelobe level characteristics based on meeting the requirements of the MIMO antenna.