Abstract In this paper a Quad-band diversity antenna with a small size of 48 × 28 × 0.8 mm3 printed on FR4 substrate is presented that consists of two same pentagonal-shaped patch elements. Four arc-shaped slots in the radiating elements are introduced to obtain the quad-band operation with good return loss. The antenna is designed for covering 5.91 GHz in IEEE 802.11 b/g/n standards, 7.40 GHz in C-Band, 9.18 and 10.72 GHz in X-Band. To achieve the lowest coupling between two elements, three structures for embedding elements are investigated. The prototype is fabricated, and measured results are in good agreement with simulated results. The final antenna accomplishes a weak mutual coupling below −29.2 dB in the all operational bands. Radiation characteristics, radiation efficiency and diversity performance such as diversity gain and envelope correlation coefficient of the final structure, are presented.

中文翻译：

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一种无需额外结构的高隔离度简单四频印刷分集天线

摘要 在本文中，提出了一种印刷在 FR4 基板上的 48 × 28 × 0.8 mm3 小尺寸四频分集天线，由两个相同的五边形贴片元件组成。在辐射元件中引入四个弧形槽以获得具有良好回波损耗的四频操作。该天线设计用于覆盖 IEEE 802.11 b/g/n 标准中的 5.91 GHz、C 波段中的 7.40 GHz、X 波段中的 9.18 和 10.72 GHz。为了实现两个元素之间的最低耦合，研究了嵌入元素的三种结构。样机制作完成，实测结果与模拟结果吻合良好。最终天线在所有工作频段中实现低于 -29.2 dB 的弱互耦合。辐射特性，