MIMO 8×8 antenna with two H-slotted rectangular patch array for 5G access radio at 15 GHz

Mobile communications utilize higher frequencies to increase bandwidth for increased throughput, one of the frequencies used is 15 GHz. Higher frequencies above 10 GHz are risky because of fading which to overcome it requires MIMO antenna system. This paper presents the design of MIMO microstrip antennas with 8 elements placed in base station. Each element is a two rectangular patches microstrip array with an H-shape slot and insert feed. The material used is Duroid Rogers 5880 with relative dielectric permittivity of 2.2 in 1.575 mm substrate, and the conductor is 35 μm thickness of copper for radiator and ground plane. The measurement of realized antenna results VSWR > 1.5 or return loss <; -14 dB in the range of 14.50 to 15.25 GHz, the gain is 9.61 dB with elliptical polarization and unidirectional radiation pattern. The results show the antenna with the bandwidth of 750 MHz is wide enough for both indoor and outdoor radio access in 5G wireless communication system in base station.