Near-Field / Far-Field Application for a Spherical Scanner at mm-Wave Frequencies
Near-Field / Far-Field Application for a Spherical Scanner at mm-Wave Frequencies
复制标题
毫米波频率球形扫描仪的近场/远场应用
DOI：
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复制
发表时间：
2018
期刊：
影响因子：
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通讯作者：
John Wynne
中科院分区：
文献类型：
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作者：
D. Rensburg;John Wynne
本文描述了为测量毫米波固定天线的辐射方向图而设计和建造的测量系统。系统定位器的机械设计确定了径向测试距离；这意味着该系统可以用作球形近场测试系统，也可以用作远场测试系统，具体取决于散热器的电气尺寸和安装位置。对于前者的实现，我们使用球面波模式展开需要创建一个具有已知采样网格的球面，任何偏差都会引入不确定性。在这篇文章中，我们展示了机械定位器在多大程度上接近理想球面，以及旋转定位器的主动角度校正如何使我们能够校正重力变形。
This paper describes a measurement system designed and built for measuring radiation patterns of stationary antennas at mm-Wave frequencies. The mechanical design of the system‘s positioner fixes the radial test distance; implying that the system can be used as either a spherical near-field or far-field test system depending on the electrical size and mounting location of the radiator. For implementation of the former, our use of a spherical wave modal expansion requires the creation of a spherical surface with known sampling grid and any deviation introduces uncertainty. We show in this paper to what extent the mechanical positioner approximates an ideal spherical surface and how active angular correction of the rotary positioners allow us to correct for gravitational deformation.