This letter presents a dual-element multiple-input–multiple-output antenna for applications in the very high frequency band. A compact geometry of microstrip line-fed radiators engaging 0.04 $ \times $ 0.04 ${{\boldsymbol{\lambda }}}^2$ footprint at 150 MHz was fabricated on an FR-4 substrate and tested in the anechoic chamber. Good circularly polarized radiation patterns were generated by employing two corner-fed meander lines and integrating slots at strategic locations of the ground. A dielectric strip was stacked above the substrate and between the two meandered elements to enable $ -$ 10 dB impedance bandwidth of 24%. In the operating frequency band from 133 to 169 MHz, the proposed antenna offered axial ratio of <3 dB, mutual coupling of >-25 dB, gain of $\sim $ 3 dBi, efficiency ( ${\boldsymbol{\eta }}$ ) of $\sim $ 80%, envelope correlation coefficient of $ < $ 0.5 and diversity gain of $\sim $ 10 dB.

中文翻译：

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通过合并曲折迹线和开槽接地之间的介质带实现 MIMO 天线小型化和宽圆极化覆盖

这封信介绍了一种用于甚高频频段应用的双元件多输入多输出天线。微带线馈辐射器的紧凑几何结构，具有 0.04$ \次 $0.04${{\boldsymbol{\lambda }}}^2$在 FR-4 基板上制造了 150 MHz 的足迹，并在消声室中进行了测试。通过采用两条角馈线曲折线和在地面的战略位置集成槽，产生了良好的圆极化辐射图。介电条堆叠在基板上方和两个曲折元件之间，以使$ -$ 10 dB阻抗带宽为24%。在 133 至 169 MHz 的工作频段内，建议的天线提供 <3 dB 的轴比，>-25 dB 的互耦合，增益为$\sim $ 3分贝，效率（ ${\boldsymbol{\eta }}$ ） 的$\sim $ 80%，包络相关系数为$ < $ 0.5和分集增益$\sim $ 10分贝。