Planar slot line slow wave structure

Abstract

The invention discloses a planar slot line slow wave structure, belonging to the microwave electrovacuum technical field, and relates to a travelling wave tube amplifier member. The planar slot line slow wave structure comprises a medium substrate (2) and a metal layer (1) located on the surface of the medium substrate (2); a slot line is carved on the metal layer (1); the shape of the slot line is a periodically bending curve. The planar slot line slow wave structure can prevent electrons which are not constrained because of disturbance from directly beating the medium substrate, thereby effectively solving the electronic accumulation problem of a micro-strip slow wave structure. The vacuum device of the planar slot line slow wave structure has the characteristics of lower work voltage, and flatter dispersion curve, thereby allowing an electron beam to be synchronous with electromagnetic waves in a wider frequency band, and further realizing the broadband design of the vacuum device. The coupling impedance curve of the vacuum device is very flat, which means the gain fluctuation of the vacuum device in a work frequency band is smaller than the micro-strip slow wave structure. Accordingly, the planar slot line slow wave structure possesses greater potential and market values in the miniaturization planar travelling wave tube slow wave structure filed.

Description

technical field [0001] The design of the invention belongs to the field of microwave electric vacuum technology, and relates to a traveling wave tube amplifier. Background technique [0002] As an important microwave and millimeter wave source, electric vacuum devices are widely used in radar, guidance, communication, microwave remote sensing and other fields. They are known as the "heart" of weapons and equipment, and their performance directly determines the level of the overall equipment. With the rapid development of aerospace engineering and electronic technology, there is an urgent need for power sources with relatively simple structure and processing technology, broadband, high power, small volume, and low cost. How to achieve miniaturization and low voltage while ensuring the advantages of high power, high efficiency, high frequency band, and wide bandwidth of electric vacuum devices, so as to better meet the needs of technological development, is an important develo...

AI Technical Summary

Problems solved by technology

However, there are some key problems in this kind of planar slow wave structure that restrict the development of miniaturized traveling wave tubes based on this kind of slow wave structure. One of them is the problem of electron accumulation on the dielectric substrate. It is impossible to achieve 100% in practice, that is to say, when vacuum devices are working, there will always be electrons hitting the slow wave structure. Traditional devices such as helical traveling wave tubes are bulky and heavy, but because electrons generally It is directly hit on the metal helix with good electrical conductivity, so electrons can be directly guided away

However, the current planar slow wave structures are all processed on the dielectric substrate by means of printed circuit boards. It will accumulate on the dielectric substrate, causing the potential to drop, thereby changing the focus of the electron beam. This process will not only destroy the dielectric substrate, affect the performance of the slow wave structure, but also cause the traveling wave tube to fail to work in severe cases.

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