Over-the-air (OTA) measurement is mandatory for 5G mm-wave wireless devices. The compact antenna test range (CATR) is the baseline method in the current version of TR 38.810 in 3rd generation partnership project (3GPP) and cellular telecommunications industry association (CTIA) millimeter-wave (mm-Wave) test plan. For CATR, both amplitude and phase variations inside the quiet zone (QZ) could affect the final OTA results significantly and hence need to be characterized carefully. Especially in the phase validation of QZ, even slight misalignments between sampling plane and incident plane wavefront due to the limited precision of the positioner or tolerance in antenna fixture could result in large phase variations, which is not the true phase property of QZ. This letter presents a method to remove the effect of the angular error due to misalignment when measuring the phase variation inside QZ. By adopting the proposed method to the measured phase data, any angular error due to misalignment with respect to the incident plane wavefront will be eliminated mathematically, leaving the true phase variations of QZ only. In the meanwhile, the proposed method can alleviate the requirements of fixture manufacture and alignment precision and reduce the test cost.

中文翻译：

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在验证 5G 毫米波 UE OTA 测试的紧凑型天线测试范围时消除相位失准


5G 毫米波无线设备必须进行空中 (OTA) 测量。紧凑型天线测试范围 (CATR) 是第三代合作伙伴项目 (3GPP) 和蜂窝电信行业协会 (CTIA) 毫米波 (mm-Wave) 测试计划中 TR 38.810 当前版本的基准方法。对于 CATR，静区 (QZ) 内的幅度和相位变化可能会显着影响最终 OTA 结果，因此需要仔细表征。特别是在QZ的相位验证中，由于定位器的精度或天线夹具的公差的限制，即使采样平面和入射平面波前之间存在轻微的未对准，也可能导致较大的相位变化，这不是QZ的真实相位特性。这封信提出了一种在测量 QZ 内的相位变化时消除由于未对准造成的角度误差影响的方法。通过对测量的相位数据采用所提出的方法，将在数学上消除由于相对于入射平面波前未对准而引起的任何角度误差，仅留下QZ的真实相位变化。同时，所提出的方法可以减轻夹具制造和对准精度的要求，降低测试成本。