This article proposes a high‐isolated tri‐port antenna group for 5G mobile terminals based on the shared radiator and mode orthogonality technology, which is realized by exciting the two orthogonal currents through two ports on a shared loop radiator and a patch antenna orthogonal to the loop on the back of the mobile terminal. The −6 dB impedance bandwidth of the three ports in the antenna group could cover the 3.4–3.6 GHz 5G band, while the isolation is above 20 dB within the antenna group, a very compact volume. In addition, a 12 × 12 MIMO antenna is proposed by integrating four antenna groups. The MIMO antenna still has measured isolation above 18 dB and efficiency above 50% over the operation band thanks to the orthogonal decoupling design. A good multiplexing performance is also achieved with the ECC of <0.08 and peak channel capacity of 60.29 bps/Hz at 20 dB SNR.
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