Dual-polarized square-ring slot-coupled patch antenna for massive MIMO application

A dual polarized square-ring slot-coupled patch antenna is proposed for the massive MIMO base station applications. The measured bandwidth for Return Loss (RL) >15dB and isolation >20dB is 14.3%. The measured results also show that the antenna has a gain of 10.5∼11.3dBi, Half Power Beam Width (HPBW) of 74∼78° in horizontal and 38∼41° in vertical, Cross Polarization Discrimination (XPD) less than 20dB in HPBW. Within the operating band, the performances of good impedance match, low cross polarization, and stable radiation pattern are achieved.