ABSTRACT In this paper, we design a compact MIMO antenna with high isolation. The antenna covers 2.5/5.8 GHz frequency bands, which are allocated for Wi-MAX / WLAN applications. The suggested MIMO antenna consists of two identical F-shaped monopole antenna elements, which are symmetrically positioned on the top side of an FR-4 substrate. To increase the isolation between the two radiating elements, a T-shaped junction is added which acts as a short stub-loaded resonator (SSLR). To improve the impedance matching, different forms are engraved on the bottom. The measured results show that the proposed antenna has impedance bandwidths of 16.23% (2.32–2.73 GHz) and10.07% (5.56–6.15 GHz), with a mutual coupling of less than –19 dB. Also, the proposed design exhibits high diversity performance in terms of ECC (9.81 dB) on the entire operating band. Furthermore, the MIMO parameters like TARC and efficiency are also studied.

中文翻译：

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使用短桩负载谐振器 (SSLR) 设计具有改进隔离度的两元件 Wi-MAX/WLAN MIMO 天线

摘要 在本文中，我们设计了一种具有高隔离度的紧凑型 MIMO 天线。天线覆盖 2.5/5.8 GHz 频段，分配给 Wi-MAX/WLAN 应用。建议的 MIMO 天线由两个相同的 F 形单极天线元件组成，它们对称地位于 FR-4 基板的顶侧。为了增加两个辐射元件之间的隔离度，添加了一个 T 形结，用作短桩负载谐振器 (SSLR)。为了提高阻抗匹配，底部刻有不同的形式。测量结果表明，该天线的阻抗带宽分别为 16.23% (2.32–2.73 GHz) 和 10.07% (5.56–6.15 GHz)，互耦小于 –19 dB。此外，所提出的设计在整个工作频段上的 ECC (9.81 dB) 方面表现出很高的分集性能。