A ten-element multi-antenna terminal for massive multiple-input–multiple-output (MIMO) in the fifth-generation (5G) sub-6 GHz with wide impedance bandwidth (IBW) is proposed. A grounded coplanar waveguide is employed to feed an inverted-F stub coupled to a hybrid loop antenna element. Through tuning, the multiple resonant modes are combined so that a wide IBW is achieved. Antenna element sites are selected along the periphery of the typical smartphone back plane of size . To improve the diversity performance, two elements are placed along the horizontal edge orthogonal to the rest of elements placed along the vertical side. The prototype of the antenna is fabricated and measured exhibiting a wide IBW of ( dB) 63% centred around 4.68 GHz. The minimum measured isolation achieved is 18 dB. The maximum simulated envelope correlation coefficient is found to be 0.21 and while the minimum antenna efficiency is 78.4%. Each element has a form factor of and printed on a 1.52 mm thick Rogers 4003 substrate with and . The proposed multi-antenna terminal is suitable for 5G sub-6 GHz (3.2–6.1 GHz) communication including long-term evolution bands 42, 43 and 46.

中文翻译：

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适用于5G低于6 GHz大规模MIMO的手机的宽带倒F末梢馈电混合环形天线

提出了用于第五代（5G）低于6 GHz的宽阻抗带宽（IBW）的大规模多输入多输出（MIMO）的十元素多天线终端。接地共面波导用于馈入耦合到混合环形天线元件的倒F型短截线。通过调谐，可以组合多个谐振模式，从而获得宽的IBW。沿着尺寸典型的智能手机背板的外围选择天线元素位置 。为了提高分集性能，将两个元素沿着与垂直元素放置的其余元素正交的水平边缘放置。天线的原型经制造和测量，显示出（ dB）63％以4.68 GHz为中心。测得的最小隔离度为18 dB。发现最大模拟包络相关系数为 0.21，而最低天线效率为78.4％。每个元素的外形尺寸为 并印在1.52毫米厚的Rogers 4003基材上 和 。提议的多天线终端适用于5G 6 GHz以下（3.2–6.1 GHz）通信，包括长期演进频段42、43和46。