In this paper, a low profile 4 × 4 multiple input and multiple output (MIMO) antenna is proposed and designed for wireless local area network (WLAN) application using a square split-ring resonator. Initially, a single square-patch antenna is designed with square-shaped split-ring slot. Subsequently, the two-element MIMO antenna is designed and it is extended to four-element MIMO antenna. Finally, the defected ground structure (DGS) is implemented in order to enhance antenna performance. The antenna elements are placed opposite to each other. The mutual coupling between the antennas elements is reduced by DGS. The proposed single, two and four-element antennas operate at 5.8 GHz for WLAN. The overall performance is measured in terms of S parameter, radiation pattern, and envelope correlation coefficient. The simulated results are verified through measurements. The simulated and measured results demonstrate that the proposed 4 × 4 MIMO antenna is the most suitable for WLAN applications.

中文翻译：

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用于 WLAN 应用的带 DGS 的 4 × 4 MIMO 天线的设计和分析

在本文中，提出并设计了一种薄型 4 × 4 多输入多输出 (MIMO) 天线，用于使用方形开环谐振器的无线局域网 (WLAN) 应用。最初，单个方形贴片天线设计有方形开口环槽。随后，设计了二元MIMO天线并将其扩展到四元MIMO天线。最后，采用缺陷接地结构 (DGS) 来提高天线性能。天线元件彼此相对放置。DGS 减少了天线元件之间的相互耦合。建议的单、二和四元天线在 5.8 GHz 下运行，用于 WLAN。整体性能是根据 S 参数、辐射方向图和包络相关系数来衡量的。模拟结果通过测量得到验证。仿真和测量结果表明，所提出的 4 × 4 MIMO 天线最适合 WLAN 应用。