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Comparison of Direct Comparison Method in VNA and Power Transfer Standard Measurements
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摘要: 校准因子是用于表征射频功率传感器示数准确度的参数，定义为功率传感器显示功率和入射功率的比值，它是功率量值传递的对象。介绍了直接比较法和基于VNA的直接比较法的组成与测量原理，阐述了等效源反射系数在直接比较法里的应用，并使用直接比较法和基于VNA的直接比较法测量了 Rohde Schwarz NRP50T 功率传感器的校准因子。测量结果显示，两种方法测量的修正后校准因子之间的最大差异为3.056%，基于VNA的直接比较法的等效源反射系数一般大于直接比较法，直接比较法不确定度评定方法成熟，仍是目前最主流的射频功率传感器校准方法。Abstract: The calibration factor is a parameter used to characterize the reading accuracy of RF power sensors, defined as the ratio of the power displayed by the sensor to the incident power. It is the object of power value transfer. This paper introduces the composition and measurement principles of the direct comparison method and the VNA-based direct comparison method. It describes the application of the equivalent source reflection coefficient in the direct calibration method. The calibration factor of the Rohde & Schwarz NRP50T power sensor was measured using both the direct calibration method and the VNA-based direct comparison method. Results show that the maximum difference between the corrected calibration factors measured by the two methods is 3.056%. The equivalent source reflection coefficient of the VNA-based direct comparison method is generally larger than that of the direct comparison method. The uncertainty evaluation method for the direct comparison method is well-established, making it currently the most prevalent RF power sensor calibration method.
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图 7 等效源反射系数测量结果
Figure 7. Equivalent source reflection coefficient measurement results
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