Design of Dual-port Antenna with Dual-split Square Ring and High Isolation Characteristics for Zero Clearance Mobile Terminals

A dual-port antenna is designed on the frame of a mobile terminal device with zero clearance. The radiator of the antenna is formed by superimposing two split square ring structures together. Two symmetrically distributed antenna ports are drawn at the appropriate position of the radiator. Thus, achieving wideband impedance characteristics and high isolation characteristics. And an
$8\times 8$
MIMO array is designed on account of antenna unit. The simulation results show that the 3: 1 Voltage Standing Wave Ratio bandwidths for the suggested
$8\times 8$
MIMO array are 3.26-3.85GHz, and the isolation is better than 14.8dB. The Envelope Correlation Coefficients are inferior to 0.22, and the radiation efficiency is better than 63.5%.