2 X 2 dual slant polarized multiple input multiple output (MIMO) antennas with reduced mutual coupling is presented for polarization and spatial diversity. The design of printed periodic array of split ring resonators (SRRs) loaded with horizontal strip transmission line is proposed to mitigate the mutual coupling among the MIMO antenna elements. An equivalent circuit model, characterizes the effect of coupling between the array of SRRs and the loaded transmission line, which together reduces the near field coupling between the adjacent antenna elements. The additional horizontal strip at the bottom is utilized to seek the return current path to the ground plane. Polarization and spatial diversity is achieved by utilizing dual slant 45⁰ polarized antenna elements with eight independent channels. All four dual polarized antenna elements are designed to operate with a VSWR of <2 for (2.3‐2.4 GHz) Band 40. Dual slant 45⁰ polarization is achieved by utilizing two printed planar bow‐tie antennas in orthogonal orientation. Measured and simulated results shows by incorporating periodic array of SRRs loaded with transmission line a considerable mutual coupling reduction of 25 to 50 dB is achieved in E‐plane, H‐plane, and D‐plane over the required band 40. An isolation of 30 dB and an average gain of 7.5 dB is measured for dual slant 45⁰ polarized antenna elements. MIMO performance metrics in terms of envelope correlation coefficient and diversity gain are also investigated.

中文翻译：

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使用加载了LTE频段40传输线的SRR的周期性阵列，可减轻2 X 2双斜极化MIMO天线中的互耦合

针对极化和空间分集，提出了具有减小的互耦合的2 X 2双斜极化多输入多输出（MIMO）天线。为了减轻MIMO天线元件之间的相互耦合，提出了一种带有水平条状传输线的裂环谐振器（SRR）印刷周期阵列的设计。等效电路模型表征了SRR阵列与负载的传输线之间的耦合效应，共同减少了相邻天线元件之间的近场耦合。底部的附加水平条用于寻找返回接地平面的电流路径。极化和空间分集是通过使用双斜面45 ^0实现的具有八个独立通道的极化天线元件。所有四个双极化天线元件均设计为在（2.3-2.4 GHz）频段40的VSWR小于2的情况下工作。通过使用两个正交的印刷平面蝴蝶结天线，可以实现45 ⁰双极化。测量和模拟结果表明，通过合并周期性负载传输线的SRR，可以在所需频段40的E平面，H平面和D平面上实现25至50 dB的相当大的互耦降低。隔离度为30对于双倾斜45 ⁰极化天线元件，测得的dB和平均增益为7.5 dB 。还研究了包络相关系数和分集增益方面的MIMO性能指标。