A miniaturized four-port polarization diversity ultra-wide band multiple input multiple output (MIMO) antenna is presented in this article. Different structures are combined and excited with the tapered transmission line to obtain a reduced symmetric layout with the orthogonal arrangement in compact size. An inverted-c-shape partial ground plane is used to decouple the antenna elements placed in close proximity which reduced the overall size and improved the matched impedance of the MIMO antenna. Further, impedance bandwidth is improved by etching the slots in the ground plane. The overall dimension of the proposed compact MIMO antenna is 40 × 40 × 1.524 mm³. The measured characteristics of a fabricated prototype on the FR4 laminate well matched with the simulated results. The antenna exhibits a quasi-omnidirectional radiation pattern on the H-plane throughout the operational bandwidth, with isolation greater than 16 dB, low envelope correlation, and gain variation. this antenna can efficiently be usedfor diversity applications and portable devices.

本文介绍了一种小型化的四端口极化分集超宽带多输入多输出 (MIMO) 天线。不同的结构与锥形传输线组合和激励，以获得具有紧凑尺寸的正交排列的减少对称布局。倒C形部分接地平面用于对放置在附近的天线元件进行去耦，从而减小了整体尺寸并提高了MIMO天线的匹配阻抗。此外，通过蚀刻接地平面中的槽可以提高阻抗带宽。所提出的紧凑型 MIMO 天线的整体尺寸为 40 × 40 × 1.524 mm ³. 在 FR4 层压板上制造的原型的测量特性与模拟结果很好地匹配。该天线在整个工作带宽的 H 平面上呈现准全向辐射模式，隔离度大于 16 dB，包络相关性低，增益变化。这种天线可以有效地用于分集应用和便携式设备。