Measurement method of reflection coefficient of calibration signal source in microwave power meter

Abstract

The invention discloses a measurement method of the reflection coefficient of a calibration signal source in a microwave power meter. The method includes the following steps that: the general expression of the incident power of a load is obtained according to the reflection coefficient of the signal source, the power of the transmission of the signal source to the non-reflection load, the reflection coefficient of the load, the phase angle of the reflection coefficient of the signal source and the phase angle of the reflection coefficient of the load; the sum of the phase angle of the reflection coefficient of the signal source and the phase angle of the reflection coefficient of the load is adjusted by a first preset angle and a second preset angle according to the general expression of the incident power of the load, so that the first expression of the incident power of the load, and the second expression of the incident power of the load can be obtained; and the general expression of the incident power of the load, the first expression of the incident power of the load and the second expression of the incident power of the load are associated, so that the reflection coefficient of the signal source can be obtained. According to the measurement method of the invention, the reflection coefficient of the calibration source can be determined through measuring the power quantity value of the calibration source under a specific phase shift condition.

Description

technical field [0001] The invention relates to the field of microwave power meter measurement and specifically designs a method for measuring the reflection coefficient of a calibration signal source in a microwave power meter. Background technique [0002] In order to ensure the measurement accuracy of the microwave power meter, the power meter is usually equipped with a 50MHz, 0dBm calibration signal source (or "reference signal source" hereinafter referred to as "calibration source" or "source") for self-calibration. The existence of mismatch error affects the calibration results, and to evaluate this effect, it is necessary to accurately measure the reflection coefficient of the calibration source. [0003] There is currently no device dedicated to measuring the reflection coefficient of a 50MHz calibration source, but there are some general signal source reflection coefficient measurement methods that can be used to achieve this measurement. [0004] If the reflection...

AI Technical Summary

Problems solved by technology

[0009] 1. This method cannot give a clear mathematical expression of the measured value, and the uncertainty of the measurement result is not easy to evaluate;

[0010] 2. The measuring device and measuring process are complicated;

[0011] 3. Calculation results depend on power measurement accuracy, usually redundant measurements are necessary

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