In this letter, a compact multi‐input multi‐output antenna operating at 3300 to 6000 MHz band is presented for 5G mobile terminals. The antenna includes four vertically placed blocks. Each block consists of two driven monopole elements and one parasitic ground branch. The parasitic branch is shared by both elements. It not only serves as radiator, but also is helpful to improve the port isolation in the lower band. By merging the multiple resonances provided by the driven monopole and the parasitic branch, wideband performance is achieved with a small block size of 28 × 4.2 mm². A prototype is fabricated and measured. The measured −6 dB bandwidth covers 3340 to 6360 MHz band, with port isolation higher than 10 dB. The radiation efficiency of all the ports is higher than 45% across the band.

中文翻译：

---

紧凑的宽带多输入多输出天线，覆盖3300至6000 MHz频段，适用于5G移动终端应用

在这封信中，提出了一种适用于5G移动终端的紧凑型多输入多输出天线，工作频率为3300至6000 MHz。天线包括四个垂直放置的块。每个模块由两个驱动单极元件和一个寄生接地分支组成。寄生分支由两个元素共享。它不仅充当辐射器，而且还有助于改善较低频带中的端口隔离。通过合并被驱动的单极子和寄生支路提供的多重谐振，可以以28×4.2 mm ²的小块尺寸实现宽带性能。原型被制造和测量。测得的-6 dB带宽覆盖3340至6360 MHz频带，端口隔离度高于10 dB。所有端口的辐射效率在整个频带内都高于45％。