A Wideband and Small Diameter Halo Antenna with Four Parasitic Elements

2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2021-08-09 DOI:10.1109/APWC52648.2021.9539725

T. Mizutani, Y. Wada, N. Michishita, H. Morishita

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Abstract

In recently, many vertically polarized antennas are mainly used for various mobile communications to save installation space. Therefore, a horizontally polarized antenna is desirable for polarization diversity to avoid interference. In addition, an omnidirectional radiation pattern is required to enable smooth transmission and reception even if the posture of the mobile changes. In this paper, we focus on the Halo antenna, which is a type of horizontally polarized antenna with an omnidirectional radiation pattern in the horizontal plane [1] . The Halo antenna is a folded dipole antenna that is bent into a cylindrical shape, and the input impedance of the Halo antenna can be adjusted by changing the gap width and the height of the antenna. However, the Halo antenna has a narrow band characteristic, and in order to reduce the lowest operating frequency of the Halo antenna while maintaining the relative bandwidth, it is necessary to increase the diameter of the antenna. Therefore, it has been reported by loading two parasitic elements in the vertical direction of the Halo antenna, the diameter of the antenna is not changed and the relative bandwidth is expanded [2] .

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带四寄生元件的宽带小直径光晕天线

近年来，许多垂直极化天线主要用于各种移动通信，以节省安装空间。因此，需要水平极化天线来实现极化分集以避免干扰。此外，即使移动设备的姿势发生变化，也需要全向辐射方向图来实现平滑的传输和接收。本文主要研究Halo天线，它是一种水平极化天线，在水平面上具有全向辐射方向图[1]。Halo天线是一种弯曲成圆柱形的折叠偶极子天线，可以通过改变天线的间隙宽度和高度来调节Halo天线的输入阻抗。但是，Halo天线具有窄带特性，为了在保持相对带宽的同时降低Halo天线的最低工作频率，需要增大天线的直径。因此，已有报道通过在Halo天线的垂直方向加载两个寄生元件，不改变天线的直径并扩大相对带宽[2]。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)

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