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Super-wideband and compact omnidirectional antenna with simple structure and improved radiation properties

机译：结构简单，辐射特性得到改善的超宽带紧凑型全向天线

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摘要

A super-wideband (SWB) omnidirectional antenna is reported in Lau et al. in 2005 and 2008, but the antenna structure was complex and the radiation properties were unsatisfactory. In this paper, a SWB omnidirectional antenna with simple structure and improved radiation properties is presented. The antenna just consists of a two-stage inverted cone and two shorting pins. The proposed two-stage cone can improve the impedance matching in super-wide bandwidth, and the optimized shorting pins can reduce the cut-off frequency more than 50%. The calculated and measured results are investigated to confirm the antenna performances. The impedance bandwidth of the antenna for voltage standing wave ratio <= 2 achieves more than 1: 22.1, covering 0.905 GHz to the above band. The smaller sizes than those referred by Lau et al. in 2008 are obtained. The profile of the antenna is 0.078 lambda(c), and the diameter of the radiation body is 0.217 lambda(c) (lambda(c) is the wavelength of the cut-off frequency of the antenna). In addition, the radiation properties of the kind of SWB omnidirectional antenna are improved obviously. In the whole band, the ripple levels in horizontal radiation patterns are not more than 6.6 dB, and the cross-polarized levels are reduced by 9 dB.
机译：Lau等人报道了一种超宽带（SWB）全向天线。在2005年和2008年，天线结构复杂且辐射性能不理想。本文提出了一种结构简单，辐射特性得到改善的SWB全向天线。天线仅由两级倒锥和两个短路针组成。提出的两级锥体可以改善超宽带宽中的阻抗匹配，并且优化的短路引脚可以将截止频率降低50％以上。研究计算和测量结果以确认天线性能。电压驻波比<= 2的天线阻抗带宽大于1：22.1，覆盖上述频带的0.905 GHz。比Lau等人提到的尺寸更小。在2008年获得。天线的轮廓为0.078 lambda（c），辐射体的直径为0.217 lambda（c）（lambda（c）是天线的截止频率的波长）。另外，这种SWB全向天线的辐射性能得到明显改善。在整个频带中，水平辐射图的纹波电平不超过6.6 dB，交叉极化电平降低了9 dB。

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  • 作者

    Chen X.; Yang L.; Wang L.; Fu G.;

  • 作者单位

    Xidian Univ, Sci & Technol Antenna & Microwave Lab, Xian 710071, Shannxi, Peoples R China|Xidian Univ, Collaborat Innovat Ctr Informat Sensing & Underst, Xian 710071, Shannxi, Peoples R China;

    Xidian Univ, Sci & Technol Antenna & Microwave Lab, Xian 710071, Shannxi, Peoples R China;

    Xidian Univ, Sci & Technol Antenna & Microwave Lab, Xian 710071, Shannxi, Peoples R China;

    Xidian Univ, Sci & Technol Antenna & Microwave Lab, Xian 710071, Shannxi, Peoples R China|Xidian Univ, Collaborat Innovat Ctr Informat Sensing & Underst, Xian 710071, Shannxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Omnidirectional antenna; Wideband; Miniaturization; Out of roundness; Cross polarization;

    机译：全向天线;宽带;小型化;不圆度;交叉极化;

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