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Eight-Port Wideband MIMO Antenna for Sub-6 GHz 5G Base Stations

Abstract:

An eight-port wide-band multiple-input multiple-output (MIMO) antenna is presented for base stations applications. The antenna is composed by four unit cells (2× 2) separated by a cross-shaped isolating block with a total size of 220× 220× 28 mm ' (2.42× 2.42× 0.3, at central frequency f=f_c=3.3 GHz). The unit cell is defined by a square cavity-backed antenna fed with two I-shaped crossed dipoles. The antenna provides 8 independent ports with 21.5 dB of minimum isolation and an impedance bandwidth (S_11 < -10dB) of 97% ranging at 1.8-5 GHz. Results show an efficiency higher than 87%, unidirectional radiation patterns and low envelope correlation coefficient. The geometry of the antenna is suitable for scaling this design to a massive MIMO system with the replication of the proposed antenna.