Beamforming MIMO array antenna for 5G-millimeter-wave application

Abstract This paper presents low mutual coupling multiple input-multiple output (MIMO) array antenna for millimetre-wave (mmw) application. The MIMO-array beamforming antenna with 2:1 VSWR band is proposed for 28.0 GHz and covers 27.04 - 28.35 GHz frequency band, which is suitable for mm-wave n261 5G-band which cover the frequency range from 27.5 - 28.35 GHz. It consists of 2×12 antenna array elements and the prototype is designed on low loss Rogers Duroid 5880 substrate of size 51.45×36.87 mm2. The beamforming MIMO antenna covers ±200 main lobe directions. The mutual coupling at the MIMO-array ports is less than 28.0 dB. The radiation efficiency and the gain in the presented band are more than 93.0% and more than 13.99 dBi. The ECC in the presented frequency band is ≤ 10−4, which is one of the advantages of the proposed design. The design covers indoor and outdoor Gaussian applications, and has 1.31 GHz TARC active bandwidth. It has 4.65% simulated and 4.73% measured fractional bandwidths.