一种具有宽角稳定相位中心的双频段圆极化GNSS天线设计 |
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引用本文: | 周云林.一种具有宽角稳定相位中心的双频段圆极化GNSS天线设计[J].现代导航,2017,8(4):285-290. |
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作者姓名: | 周云林 |
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作者单位: | 中国电子科技集团公司第二十研究所,西安 710068 |
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摘 要: | 本文介绍了一种在宽波束范围内具有稳定相位中心的双频段圆极化 GNSS(全球卫星导航系统)天线。天线设计为层叠空气腔式天线结构,采用幅度相等,相位相差 90°的四端口馈电方式,空气腔式天线在宽角范围内获得了较好的圆极化辐射特性。对称结构以及等幅等相差馈电的天线设计,可在宽角范围内获得较高的相位中心稳定度。测试结果表明:在四个导航频段内, 天线波束宽度大于±36°,±46°角域范围内的轴比小于 3dB,±70°角域范围内的相位中心稳定度小于 1.61mm,具备很强的工程应用价值。
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关 键 词: | 相位中心稳定度 层叠 双频段 四馈 圆极化 GNSS 天线 |
Dual-Band Circular Polarized GNSS Antenna With Stable Phase Center in Wide Angle |
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Authors: | ZHOU Yunlin |
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Abstract: | A dual-bands circularly polarized GNSS (Global Satellite Navigation System) antenna with stable phase center in wide angle is proposed in this paper. The antenna employs a stacked air-box structure, four ports with equal amplitudes is used for antenna excitation with 90° phase difference successively, in order to achieve good circularly polarized radiation. By using a symmetry structure and feeding by two four points, which are equal in amplitude and equally spaced in phase, high phase center stability can be obtained in a broad angular domain. The model of the antenna is simulated, and a prototype is fabricated and measured. The measured results in GPS L1, L2 band & BD B1, B2 band show that the antenna beam width is greater than ±36°, and at the same time the stability of the antenna phase center is up to 1.61 mm at the domain range angle -70°~70°, and 3dB axial ratio angles are more than -46°~46°,which indicate that the antenna has great engineering application value. |
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