Electrically Small, Planar, Horizontally Polarized Dual-Band Omnidirectional Antenna and Its Application in a MIMO System
Electrically Small, Planar, Horizontally Polarized Dual-Band Omnidirectional Antenna and Its Application in a MIMO System
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DOI：
10.1109/tap.2021.3061096
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发表时间：
2021-09-01
影响因子：
5.7
通讯作者：
Zheng, Shao Yong
中科院分区：
文献类型：
--
作者：
Hu, Peng Fei;Leung, Kwok Wa;Zheng, Shao Yong
提出了一种微型平面双频水平极化（HP）全向天线的设计方法。它将小型电 (ES) 低频段全向环形天线与高频段 Alford 环形天线结合在单个基板上。其频率比高于二。开发了一种有效增加阿尔福德环路带宽的技术。为了减少方位角平面上的增益变化，ES环路由从圆形贴片延伸的四个对称径向带馈电。为了进行演示，ES 环路和 Alford 环路专为 Wi-Fi 应用的 2.4 和 5 GHz Wi-Fi 频段而设计。天线原型的直径为 0.296 lambda(0)，高度仅为 0.012 lambda(0)，其中 lambda(0) 是最低工作频率下空气中的波长。它覆盖2.4-2.5和5.1-5.9 GHz的Wi-Fi频段，总效率高达90%左右。基于单元件设计，我们开发了适用于 Wi-Fi 应用的四元件多输入多输出 (MIMO) 天线。 MIMO天线的尺寸为0.93 x 0.93 x 0.012 lambda(3)(0)，在方位角平面上增益变化小于3.2 dB。对于 2.4 GHz 和 5 GHz 频段，任意两个天线元件之间的隔离度分别高于 16 和 24.5 dB。
A method of designing a miniature planar dual-band horizontally polarized (HP) omnidirectional antenna is presented. It combines an electrically small (ES) lower band omnidirectional loop antenna with an upper band Alford loop antenna on a single substrate. Its frequency ratio is higher than two. A technique that effectively increases the bandwidth of the Alford loop is developed. To reduce the gain variation in the azimuthal plane, the ES loop is fed by four symmetrical radial strips extended from a circular patch. For demonstration, the ES loop and Alford loop were designed for the 2.4 and 5 GHz Wi-Fi bands for Wi-Fi applications. The antenna prototype has a diameter of 0.296 lambda(0) and a height of 0.012 lambda(0) only, where lambda(0) is the wavelength in air at the lowest operating frequency. It covers the Wi-Fi bands of 2.4-2.5 and 5.1-5.9 GHz, with a high total efficiency of similar to 90%. Based on the single-element design, a four-element multiple-input-multiple-output (MIMO) antenna is developed for Wi-Fi applications. The MIMO antenna has a size of 0.93 x 0.93 x 0.012 lambda(3)(0), with a small gain variation of less than 3.2 dB in the azimuthal plane. The isolations between any two antenna elements are higher than 16 and 24.5 dB for the 2.4 and 5 GHz bands, respectively.