Designing MIMO Omnidirectional Millimeter-Wave MetamaterialAntenna for 5G Communications

A highly efficient, low profile, wideband metamaterial antenna is presented for mm-wave 5G communications. The designed metamaterial resonator structure works as a radiator and operates in the FCC auctioned 28 GHz frequency spectrum (27.5 - 28.350 GHz). The proposed antenna is fabricated on a 10.3mm x 10.3mm and .0787 mm thick Rogers RT5880/Duroid substrate and probe feed is used as the feeding mechanism. The effect of different design parameters on the performance of the antenna is examined and then optimized for the best possible performance. The designed antenna shows wideband characteristics with an impedance bandwidth of 2.22 GHz (27.49 – 29.71 GHz) measured at -10 dB. The structure is simulated in CST microwave studio and then fabricated. The measured radiation pattern is omnidirectional with a peak gain of 3.74 dB and a radiation efficiency of 95%. The antenna has a total efficiency of 92%. Furthermore, the diversity performance of the MIMO antenna is investigated which shows a maximum coupling of -13.5 dB measured at 28 GHz frequency band