Compact and Low-Profile Omnidirectional Circularly Polarized Antenna With Four Coupling Arcs for UAV Applications
Compact and Low-Profile Omnidirectional Circularly Polarized Antenna With Four Coupling Arcs for UAV Applications
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DOI：
10.1109/lawp.2017.2752358
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发表时间：
2017-09
影响因子：
4.2
通讯作者：
Dan Wu;X. Chen;Long Yang;G. Fu;Xiao-wei Shi
中科院分区：
文献类型：
--
作者：
Dan Wu;X. Chen;Long Yang;G. Fu;Xiao-wei Shi
提出了一种小型低剖面四弧耦合全向圆极化天线。在该结构中，四个外圆弧用于产生水平极化，一个内圆盘加载馈电针用于产生垂直极化。因此，通过组合来自电弧和馈电引脚的辐射来实现全向CP辐射。外弧端采用四个短路销，对天线的小型化起到了很大的作用。此外，天线的尺寸可以减少更多的加载四个内耦合弧外弧。一个L波段的天线原型的计算，制造和测量。它的最终尺寸是0.16 {\lambda _0} \times 0.16{\lambda _0} \times 0.03{\lambda _0}$（${\lambda _0}$是工作频率下的自由空间波长）。测试结果表明，其阻抗带宽（VSWR ≤2）为13 MHz（1429-1442 MHz）。在工作频带内，轴比小于2.4dB，峰值增益达到1.01dBic。该天线能够满足我国特种无人机通信对重量、尺寸、频段的要求。
A compact and low-profile omnidirectional circularly polarized (CP) antenna with four coupling arcs is presented. In this structure, four outer arcs are utilized to generate horizontal polarization, and an inner disk-loaded feeding pin can produce vertical polarization. Thus, omnidirectional CP radiation is achieved by combining the radiation from the arcs and the feeding pin. Four shorting pins are employed at the end of the outer arcs, which play a great role on the miniaturization of the antenna. Furthermore, the antenna's dimensions can be reduced more by loading four inner coupling arcs inside the outer arcs. An L-band prototype of the antenna is calculated, fabricated, and measured. Its final dimensions are $0.16{\lambda _0} \times 0.16{\lambda _0} \times 0.03{\lambda _0}$ (${\lambda _0}$ is the free-space wavelength at operating frequency). The results show the impedance bandwidth (VSWR ≤2) of 13 MHz (1429–1442 MHz). In the operating frequency band, the axial ratios are less than 2.4 dB, and the peak gain reaches 1.01 dBic. This type of antenna can meet the requirements of the weight, dimensions, and frequency bands for special unmanned aerial vehicle communications in China.