In this paper, a dual-band 8 × 8 multi-input multi-output (MIMO) array antenna operating in 3.5 GHz band (3400–3600 MHz) and 5.5 GHz band (5150–5925 MHz) for 5G mobile handset is presented. The proposed hybrid antenna includes a comb-shaped monopole and an L-shaped open slot antenna which are symmetrically located on the inner surface of the side-edge frame of smartphone. Pattern diversity is achieved that can mitigate envelope correlation coefficients (ECCs) and improve the MIMO system performances. The prototype of proposed dual-band eight-element MIMO antenna is fabricated and experimentally measured. The results show that isolation <−10 and <−15 dB, respectively in the lower band and high band without any additional decoupling element are achieved and the desired bands are satisfied under the condition of −6 dB impedance matching. Moreover, the essential parameters for evaluation of the MIMO system performance such as the ECC, mean effective gain (MEG), and ergodic channel capacity are calculated. Furthermore, the influence of user's hand on the radiation characteristics of proposed MIMO antenna are also investigated and discussed. Based on the result, the proposed MIMO antenna is a good candidate for use in future 5G applications.

本文介绍了一种用于 5G 手机的双频段 8 × 8 多输入多输出 (MIMO) 阵列天线，工作在 3.5 GHz 频段（3400-3600 MHz）和 5.5 GHz 频段（5150-5925 MHz）。所提出的混合天线包括一个梳状单极天线和一个 L 形开槽天线，它们对称地位于智能手机侧边框的内表面。实现了可以减轻包络相关系数 (ECC) 并提高 MIMO 系统性能的模式分集。所提出的双频八元 MIMO 天线的原型被制造和实验测量。结果表明，在没有任何额外去耦元件的情况下，分别在低频段和高频段实现了<-10和<-15 dB的隔离，并且在-6 dB阻抗匹配的条件下满足了所需的频段。此外，计算了用于评估 MIMO 系统性能的基本参数，例如 ECC、平均有效增益 (MEG) 和遍历信道容量。此外，还研究和讨论了用户手对所提出的MIMO天线辐射特性的影响。基于该结果，所提出的 MIMO 天线是未来 5G 应用的良好候选者。