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A Four-Element 5G MIMO Antenna Design for Mobile Terminals Using Self-Curing Decoupling Technique

In this paper, a four-element 5G MIMO antenna design working at N78 (3.3 - 3.8 GHz) is presented. To reduce the mutual coupling between antenna elements, the self-curing decoupling technique is used. By adding a lumped capacitor on the ground near the shorting arm of each antenna, the antenna array can be effectively decoupled. In this design, the main PCB size imitates a typical mobile phone (150 x 75 mm), and two inverted-F antennas (IFAs) are located on the left long side board, with the other two on the right side board. The simulated results show that the mutual coupling among the antenna elements can be mitigated to below -15 dB throughout the N78 band, and the simulated average total efficiency is improved from 72 to 89 % after decoupling.