Low Mutual Coupling Dual-port Dual-band MIMO Antenna Array for Mobile Terminal

Abstract

A dual-port dual-band multiple-input-multiple-output (MIMO) antenna array comprises of two printed circular monopole antennas is presented. Based on simulated data, the -10 dB impedance bandwidth of the antenna is noted from 2.3 GHz to 2.8 GHz and 3.37 GHz to 3.72 GHz. The isolation between the antenna elements is enhanced by connecting antennas through a microstrip neutralisation line along with a stub in the ground plane. Mutual coupling is found to be below -15 dB with an inter-element spacing of 0.092 times the free-space wavelength at 2.3 GHz. The maximum gain of the antenna is noted to be 3.66 dBi with an envelope correlation coefficient ≤ 0.06211 in its entire bandwidth.