In this paper, a low-profile circularly polarized (CP) conical-beam antenna with a wide overlap bandwidth is presented. Such an antenna is constructed on the two sides of a square substrate. The antenna consists of a wideband monopolar patch antenna fed by a probe in the center and two sets of arc-hook-shaped branches. The monopolar patch antenna is loaded by a set of conductive shorting vias to achieve a wideband vertically polarized electric field. Two sets of arc-hook-shaped parasitic branches connected to the patch and ground plane can generate a horizontally polarized electric field. To further increase the bandwidth of the horizontally polarized electric field, two types of arc-hook-shaped branches with different sizes are used, which can generate another resonant frequency. When the parameters of the arc-hook-shaped branches are reasonably adjusted, a 90° phase difference can be generated between the vertically polarized electric field and the horizontally polarized electric field, so that the antenna can produce a wideband CP radiation pattern with a conical beam. The proposed antenna has a wide impedance bandwidth () of 35.6% (4.97-7.14 GHz) and a 3 dB axial ratio (AR) bandwidth at and of about 30.1% (4.97-6.73 GHz). Compared with the earlier reported conical-beam CP antennas, an important feature of the proposed antenna is that the AR bandwidth is completely included in the impedance bandwidth, that is, the overlap bandwidth of and is 30.1%. Moreover, the stable omnidirectional conical-beam radiation patterns can be maintained within the whole operational bandwidth.

中文翻译：

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具有宽重叠带宽的薄型圆极化圆锥波束天线

本文提出了一种具有宽重叠带宽的低剖面圆极化（CP）锥形束天线。这种天线构造在正方形基板的两侧。该天线由一个宽带单极贴片天线组成，该天线由中心的探针馈电，以及两组弧形钩状分支。单极贴片天线由一组导电短路通孔加载，以实现宽带垂直极化电场。连接到贴片和接地平面的两组弧形钩状寄生分支可以产生水平极化电场。为了进一步增加水平极化电场的带宽，使用了两种大小不同的弧形钩状分支，它们可以产生另一个谐振频率。适当调整圆弧状分支的参数，可以在垂直极化电场与水平极化电场之间产生90°的相位差，从而天线可以产生圆锥形的宽带CP辐射方向图。光束。拟议的天线具有较宽的阻抗带宽（）的35.6％（4.97-7.14 GHz）频率和3 dB的轴向比率（AR）带宽 和 约为30.1％（4.97-6.73 GHz）。与较早报道的锥形波束CP天线相比，所建议天线的一个重要特征是AR带宽完全包含在阻抗带宽中，也就是AR的重叠带宽。 和 是30.1％。而且，可以在整个工作带宽内保持稳定的全向锥形束辐射方向图。