A self‐decoupled antenna element working at half‐ wavelength mode is proposed and implied into an eight‐element multiple‐input‐multiple‐output (MIMO) antenna array for the fifth‐generation (5G) smartphones applications. Particularly, self‐ decoupled is conveyed by the feature of balanced antenna, which is composed of an open slot (0.197 λ₀ × 0.035 λ₀ at 3.5 GHz) excited by a two‐arm feedline located on the horizontal ground board and a half‐wavelength dipole‐type mode is formed. A week ground current effect and high‐isolation level are achieved with no additional decoupling stub. Besides, the location of the element is thoroughly considered to achieve a desirable decoupling effect. In the desired 3.5 GHz band (3.4‐3.6 GHz), isolation of more than 18.5 dB and total efficiency of more than 65% are obtained. The proposed MIMO antenna was simulated and fabricated. The corresponding performances were claimed by simulated results and measured ones, a good uniformity between the two was obtained.

中文翻译：

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适用于5G智能手机的八元素自解耦MIMO天线设计

提出了一种在半波长模式下工作的自解耦天线元件，并将其隐含在用于第五代（5G）智能手机应用的八元件多输入多输出（MIMO）天线阵列中。特别是，自解耦被输送通过平衡天线的功能，该功能由一个开放的槽（0.197的λ ₀  ×0.035 λ ₀在3.5 GHz时）由位于水平接地板上的两臂馈电线激发而形成半波长偶极型模式。无需额外的去耦短线即可实现一周的接地电流效应和高隔离度。此外，充分考虑元件的位置以实现理想的去耦效果。在所需的3.5 GHz频带（3.4-3.6 GHz）中，隔离度超过18.5 dB，总效率超过65％。拟议的MIMO天线进行了仿真和制作。通过仿真结果和实测值对相应的性能进行了声称，两者之间具有良好的一致性。