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A wideband 8-antenna multiple-input and multiple-output (MIMO) system that can cover 3.3–5.0 GHz is proposed for the 5G new radio N77/N78/N79 application in mobile phones. The wide bandwidth of the MIMO antenna system is obtained by the proposed coupled-loop antenna, which has three coupling sections located separately at its top central and two sides. Due to this special arrangement, the coupled-loop antenna can support three resonance modes of loop antenna: <inline-formula> <tex-math notation="LaTeX">$0.5\lambda $ </tex-math></inline-formula>, <inline-formula> <tex-math notation="LaTeX">$0.75\lambda $ </tex-math></inline-formula>, and <inline-formula> <tex-math notation="LaTeX">$1.0\lambda $ </tex-math></inline-formula> modes. The distinctive feature of the proposed coupled-loop antenna design is that it can excite the <inline-formula> <tex-math notation="LaTeX">$0.75\lambda $ </tex-math></inline-formula> modes, which has not been reported before. The wide bandwidth is obtained by the combination of the three resonance modes. To evaluate the performance of the proposed <inline-formula> <tex-math notation="LaTeX">$8\,\,\times 8$ </tex-math></inline-formula> MIMO antenna system, the antenna isolation, envelope correlation coefficient (ECC), and channel capacity (CC) are all investigated. Antenna prototypes for an 8-antenna MIMO system located along the edge of mobile phones are fabricated and measured, and; quite good agreements between simulation and measurement are obtained.

Wideband MIMO Antenna Systems Based on Coupled-Loop Antenna for 5G N77/N78/N79 Applications in Mobile Terminals