In this paper, a wideband eight‐element antenna array operating in the 5G (Fifth‐generation) NR (New Radio) frequency bands N77/N78/N79 (3300‐5000 MHz), LTE (Long Term Evolution) band 46 (5150‐5925 MHz), and EU (European Union) 5G band of 5900 to 6400 MHz for 8 × 8 MIMO (Multi‐Input Multi‐Output) operation in the future 5G mobile terminal is presented. The proposed eight antenna elements are all co‐coupled‐fed IFA (Inverted‐F antenna)/loop structure, and are divided into two same sub‐arrays which printed on the inner surface of two long frames of the mobile terminal, respectively. All the simulated and measured results present consecutive 6‐dB impedance bandwidth of 3200 to 6500 MHz, acceptable isolations (better than 12 dB), and good total efficiencies (more than 50%). Besides, the proposed wideband 8‐antenna MIMO system has also shown good MIMO performances with ECCs (envelope correlation coefficient) are all lower than 0.08, and ergodic channel capacities are all higher than 37.8 bps/Hz within the entire desired operation bands. In addition, the hand phantom effects are also investigated. The prototype of the proposed wideband eight‐element antenna array is fabricated and measured, and a quite good agreement between simulation and measurement is obtained.

中文翻译：

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在未来5G移动终端应用中，在3300至6400 MHz的宽带中运行的MIMO天线系统设计

本文介绍了在5G（第五代）NR（新无线电）频段N77 / N78 / N79（3300-5000 MHz），LTE（长期演进）46（5150-介绍了未来5G移动终端中用于8×8 MIMO（多输入多输出）操作的5900至6400 MHz的欧盟5G频段（5925 MHz）。拟议的八个天线元件均为共耦合IFA（倒F天线）/环路结构，并分为两个相同的子阵列，分别印刷在移动终端的两个长框架的内表面上。所有仿真和测量结果均显示出3200至6500 MHz的连续6 dB阻抗带宽，可接受的隔离度（优于12 dB）以及良好的总效率（超过50％）。除了，提议的宽带8天线MIMO系统还显示出良好的MIMO性能，其中ECC（包络相关系数）均低于0.08，遍历信道容量在整个所需的工作频段内均高于37.8 bps / Hz。另外，还研究了手的幻影效果。制造并测量了所提出的宽带八元天线阵列的原型，并在仿真和测量之间取得了很好的一致性。