A Dual-Polarized MIMO Antenna Array with High Isolation for Base Stations

A dual-polarized MIMO antenna array with high isolation for the communication system of base stations is presented in this paper. The radiation aperture is composed of 64 microstrip patchs. A differential feed network is introduced to achieve high isolation between two input ports. This structure reduces the cross polarization excited by the adjacent input ports and the simulated isolation of the dual-polarized ports is better than 35dB in 1.38GHz-1.53GHz with
$\text{VSWR} < 2$
. The simulation results of the MIMO antenna array show that its beam-scanning angles can be ±50° with the gain greater than 20.4dBic. Moreover, the cross-polarization isolation levels at all the scanning angles are better than 41dB.