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首页> 外文期刊>Journal of Infrared, Millimeter and Terahertz Waves >Determination of the Phase Centers of Millimeter-Wave Horn Antennas Using a Holographic Interference Technique
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Determination of the Phase Centers of Millimeter-Wave Horn Antennas Using a Holographic Interference Technique

机译：使用全息干涉技术确定毫米波喇叭天线的相位中心

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摘要

In this paper, we discuss how a holographic interference technique can be applied in the experimental determination of the phase centers of non-standard horn antennas in the millimeter-waveband. The phase center is the point inside the horn from which the radiation appears to emanate when viewed from the far-field, and knowing its location is necessary for optimizing coupling efficiencies to quasi-optical systems. For non-standard horn designs, and other feed structures, the phase center may be difficult to reliably predict by simulation, in which case, before committing to antenna manufacture, there is a requirement for it to be determined experimentally. Although the phase center can be recovered by direct phase measurement of the far-field beam pattern, this usually involves expensive instrumentation such as a vector network analyzer for millimeter wave horn antennas. In this paper, we describe one inexpensive alternative, which is based on measuring the interference pattern in intensity between the radiation from the horn of interest and a reference beam derived from the same coherent source in an off-axis holography setup. The accuracy of the approach is improved by comparison with the interference pattern of a well-understood standard horn (such as a corrugated conical horn) in the same experimental setup. We present an example of the technique applied to a profiled smooth-walled horn antenna, which has been especially designed for cosmic microwave background (CMB) polarization experiments.
机译：在本文中，我们讨论了如何将全息干扰技术应用于实验确定毫米波段非标准号角天线的相位中心。相位中心是号角内部的一个点，从远场观看时，辐射似乎从该点发出，并且知道其位置对于优化与准光学系统的耦合效率是必要的。对于非标准号筒设计和其他馈电结构，可能难以通过仿真可靠地预测相位中心，在这种情况下，需要致力于天线制造，需要通过实验确定。尽管可以通过对远场波束方向图进行直接相位测量来恢复相位中心，但这通常涉及昂贵的仪器，例如用于毫米波喇叭天线的矢量网络分析仪。在本文中，我们描述了一种廉价的替代方法，该方法基于在离轴全息照相设置中测量目标喇叭辐射与参考光束的强度之间的干涉图样，该参考光束源自同一相干源。通过与在相同实验设置中易于理解的标准喇叭（例如波纹圆锥形喇叭）的干涉图进行比较，可以提高该方法的准确性。我们提供了一个应用于轮廓光滑壁喇叭天线的技术示例，该天线专门设计用于宇宙微波背景（CMB）极化实验。

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