Abstract
This paper proposes a high-isolation MIMO antenna based on the characteristic mode analysis. The antenna design uses monopoles as array elements, and the theory of characteristic mode (TCM) is used to determine the placement of DGS in the MIMO antenna design to improve the isolation between the element ports. To improve the isolation, the DGS should be placed in a specific position to attenuate the coupled mode without affecting the uncoupled mode. If there is no such specific location, the isolation cannot be further improved. The simulation results show that the designed antenna operates in the frequency band of 2.9~ 4.2 GHz, which covering the 5G communication band of 3.3 ~ 3.6 GHz, and the minimum isolation is improved from 13 dB to 25 dB.
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