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Experimental study demonstrates high isolation and efficiency in a dual-band 8×8 MIMO antenna array, suggesting improved compact integration for 5G mobile terminals.
A novel self-decoupling dual-band 8 × 8 multiple-input multiple-output (MIMO) antenna system is proposed for 5G mobile terminals.Each antenna pair employs M-shaped dual feeding lines for coupled excitation, feeding a hybrid radiating structure integrating an H-shaped primary radiator and a T-shaped additional element. By the common-mode (CM) and differential-mode (DM) cancellation method, the design equalizes CM and DM impedances to cancel coupling currents on the shared radiator, achieving inherent high isolation at 3.5 GHz and 4.9 GHz bands. T-shaped ground plane stubs between same-side antenna pairs further enhance overall isolation.Simulations of the final model agree well with measurements. The -10 dB bandwidth covers 3.4–3.6 GHz and 4.8–5.0 GHz. Isolation exceeds 18 dB in the low band and 20 dB in the high band, with total efficiency of 88%–93% and 63%–90% respectively.
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Lin et al. (2026) studied this question.
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