A cut-off microwave power attenuator

Abstract

The invention provides a cut-off microwave power attenuator which is high in high-power microwave power measurement accuracy and capable of reducing uncertainty introduced in the attenuation calibration link. The cut-off microwave power attenuator comprises electric connectors, a cut-off waveguide assembly and electrodes. The cut-off waveguide assembly comprises a plurality of cut-off waveguides with different lengths corresponding to different attenuations. The electric connectors are connected to the two ends of the different cut-off waveguides in a matched mode respectively. The sides, located at the cut-off waveguides, of electric connector core wires are connected with the exciting electrodes for transmitting and receiving electromagnetic waves respectively. According to the cut-off microwave power attenuator, since the cut-off waveguides with the different lengths corresponding to the different attenuations are adopted as original power attenuation parts, the cut-off waveguides with the different lengths can be correspondingly selected according to different attenuation requirements, and the problem that a traditional attenuator is poor in manufacturing repeatability is solved; the cut-off waveguides as linear devices can not cause waveform deformation in the attenuation process, so that the waveform fidelity performance is excellent, and the cut-off microwave power attenuator is applicable to accurate measurement of high-power microwave power in a strong electromagnetic environment.

Description

technical field [0001] The invention relates to the technical field of microwave radiation field power measurement, in particular to a cut-off microwave power attenuator. Background technique [0002] With the application of high-power microwave technology in high-energy particle accelerators, plasma heating, high-power radar and other fields, people have put forward higher and higher requirements for high-power microwave measurement technology. However, high-power microwaves usually have the characteristics of high peak power, short pulse width, single pulse or pulse train, and strong electromagnetic interference or even ray interference in the measurement environment, which makes it difficult to accurately measure power. [0003] The existing high power microwave measurement method is to attenuate the high power to the medium power or low power first and then measure directly. This high-power microwave measurement device usually consists of a microwave directional coupler...

AI Technical Summary

Problems solved by technology

[0004] The traditional microwave power attenuator used in the measurement device is mainly an absorption attenuator, and its attenuation mainly depends on the microwave absorbing material inside the attenuator. This kind of attenuator has the following problems: First, due to the limitation of the manufacturing process between different batches The consistency of the absorbing material is poor, and the repeatability of the attenuator based on the absorbing material is not ideal

Second, in the environment of strong electromagnetic radiation and rays, the absorbing materials of traditional microwave power attenuators are also prone to aging and cause changes in attenuation, resulting in errors in microwave power measurement

Third, the attenuator with large attenuation is used in the high-power microwave measurement device, and the attenuation of the attenuator must be calibrated before use. Usually, the calibration uncertainty introduced in the process of calibrating the large attenuation with a vector network analyzer Larger, the accuracy of the measurement system is therefore limited

Among the existing technologies, the vector network analyzer is more accurate for small attenuation calibration, but its uncertainty increases significantly when the attenuation is greater than 40dB. In practical applications, the calibration of large attenuation attenuators is still a problem, which restricts microwave radiation. Accuracy of field power measurement systems

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