Coupler calibrating method

Abstract

The invention discloses a coupler calibrating method which comprises the following steps: using a first coupler calibrating device and a second coupler calibrating device to measure the background value of the coupling factor and the background value of the reflection coefficient of a to-be-measured coupler; using a high temperature cabinet to raise the temperature of the to-be-measured coupler to the required temperature and keeping the temperature stable; using a vector network analyzer to measure the coupling factor and the reflection coefficient of the to-be-measured coupler to obtain the high-temperature measurement value of the coupling factor and the high-temperature measurement value of the reflection coefficient of the to-be-measured coupler; calculating the difference value between the high-temperature measurement value of the coupling factor of the to-be-measured coupler and the background value of the coupling factor of the to-be-measured coupler to obtain the true value of the coupling factor of the to-be-measured coupler; calculating the difference value between the high-temperature measurement value of the reflection coefficient and the background value of the reflection coefficient of the to-be-measured coupler to obtain the true value of the reflection coefficient of the coupler. The calibrating method provided by the invention is applicable to calibrating of the high-power coupler, and the method can greatly improve the calibrating accuracy of the high-power coupler.

Description

technical field [0001] The invention relates to the technical field of coupler calibration, in particular to a coupler calibration method, which is suitable for high-power couplers. Background technique [0002] With the rapid development of long-distance radar and high-power microwave technology, the power of microwave sources is constantly increasing. At present, the peak power of the microwave source required for practical application is as high as GW, and its average power is as high as kW. For such a high-power microwave source, the measurement methods in the prior art cannot directly measure its power. Usually, it is necessary to use a coupler to couple the microwave emitted by the microwave source into a low-power microwave, and then realize the measurement of the microwave source by measuring the low-power microwave. Indirect measurement of power. The coupler needs to be calibrated before using the coupler to couple microwaves. [0003] When a coupler is used to c...

AI Technical Summary

Problems solved by technology

[0004] The coupler calibration method in the prior art uses a vector network analyzer to measure the coupling degree and reflection coefficient of a low-power coupler at room temperature, without considering the influence of the temperature rise of the coupler on the calibration

For couplers with small and medium power, that is, for couplers with an average power of less than 1kW, the temperature rise of the coupler during operation has little influence on calibration, and the coupler calibration method in the prior art produces less error

However, when the power of the coupler is greater than 1kW, the influence of the temperature rise of the coupler itself on the calibration will increase when the coupler is working, so that the calibration method in the prior art cannot meet the needs of practical applications.

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