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2025-02-15
Broadband Eight-Element MIMO Antenna with High Isolation for 5G Smartphone Applications
By
Progress In Electromagnetics Research C, Vol. 152, 209-219, 2025
Abstract
To satisfy the demand for 5G communication to smartphone terminal antennas in element quantity and isolation, an eight-element broadband MIMO antenna system with high isolation is proposed in this paper. The antenna element consists of an L-shaped feed line and a rectangular slot with an open slot. Meanwhile, a stepped impedance tuning structure was integrated within the rectangular slot to optimize broadband impedance matching and expand the operational bandwidth. In addition, a Chinese character ``工''-shaped defective ground structure has been innovatively designed to reduce surface wave coupling on the ground plane, achieving an isolation level of over -15 dB. Furthermore, eight antenna elements and six defective ground structures are symmetrically distributed along the long edges of the substrate, with coupling feeding performed through the L-shaped feed lines. The proposed antenna system ultimately achieves an operating bandwidth of 3.4-6.5 GHz below -10 dB, with a total efficiency greater than 90% and an envelope correlation coefficient of less than 0.016. The stability of the system in overlay screen mode, as well as in single-handed and dual-handed smartphone operation modes, is also demonstrated to showcase its practical applications.
Citation
Zhonggen Wang, Shunqi Liu, Wenyan Nie, Ming Yang, and Chenlu Li, "Broadband Eight-Element MIMO Antenna with High Isolation for 5G Smartphone Applications," Progress In Electromagnetics Research C, Vol. 152, 209-219, 2025.
doi:10.2528/PIERC24123103
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