System and method for testing power stability of highly stable radiofrequency signal

Abstract

The invention discloses a system and method for testing power stability of a highly stable radiofrequency signal. The system includes a directional coupler, an attenuator set, a microwave power meter, an upper computer, a high precision digital universal meter and a diode detector. The directional coupler is successively in serial connection to the attenuator set and the microwave power. The upper computer conducts system application measurement and control respectively on the microwave power meter and the high precision digital universal meter. A coupling end of the directional coupler is connected to the diode detector. The diode detector is in connection to the high precision digital universal meter and is a gallium arsenide diode detector. According to the invention, the system and the method have the following benefits: through the testing of stability of demodulation voltage, the evaluation object in testing the power stability of the radiofrequency signal is synchronously acquired in a non-distortion manner, and a constant temperature chamber and a gallium arsenide device are configured to reduce the influence on the demodulation voltage by temperature changes to the minimum with the proviso that the power of the input radiofrequency signal stays unchanged.

Description

technical field [0001] The invention relates to the technical field of microwave testing, in particular to a testing system and method suitable for high stability radio frequency signal power stability. Background technique [0002] Power is one of the basic parameters in the high-frequency and microwave fields, which characterizes the transmission characteristics of high-frequency and microwave sources, mainly including index characteristics such as power accuracy and power stability. In some practical applications that require high stability of the output power (amplitude) of the RF signal, especially when the stability of the power (amplitude) reaches 0.1% or even higher, how to effectively test and trace the stability characteristics has become a problem. Technical problems that urgently need to be solved. [0003] At present, the power accuracy and power stability test of the radio frequency signal is usually carried out by a microwave power meter, and the radio freque...

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Problems solved by technology

[0004] The power stability of existing radio frequency signals is usually obtained by using a microwave power meter for testing and calculation based on the power measurement mode. It can be seen from the above that when the amount of test data is large enough, the power measurement has the greatest impact on the power stability results. The data results, while the power measurement data results are limited by the power meter measurement accuracy and stability and other index characteristics

When the power (amplitude) stability of the radio frequency signal reaches 0.1% or even higher, according to the usual mode of measurement calibration, to achieve effective test evaluation, the power measurement accuracy and stability and other indicators should reach at least 0.03% ~ 0.01% Or a higher order, but the current traditional microwave power meter's highest accuracy index of 0.2% and the unspecified stability characteristics cannot meet the test requirements of high stability RF signal power stability

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