Ultra-wideband quasi-open slow-wave structure

Abstract

The invention discloses an ultra-wideband quasi-open slow-wave structure comprising two identical metal plates and supporting metal walls or mediums on the two sides. The center positions on the broad edges of the lower side of the upper metal plate and the upper side of the lower metal plate are each loaded with a striped metal ridge with periodic ups and downs along the longitudinal direction, wherein the width is Rw, the height is Rh, and the cycle length of the ups and downs is p. Thus, a striped electron beam channel is formed in the space between the striped metal ridges, and the height hb is the difference between the difference b of the metal plates and two times of ridge height Rh. The slow-wave structure has a natural electron beam channel, requires no additional processing, is of low processing difficulty and large coupling impedance, and is very beneficial to oscillation starting of a backward wave oscillator. The slow-wave structure is of low low-end cut-off frequency, and has the characteristics of ultra wideband and small high-frequency transmission reflection.

Description

technical field [0001] The invention belongs to the technical field of vacuum electronics, and more specifically relates to an ultra-broadband quasi-open slow wave structure suitable for working in a terahertz band return wave tube. Background technique [0002] Terahertz (THz for short) usually refers to electromagnetic waves with a frequency of 0.1-10 THz (wavelength of 0.03-3 mm), which is located between infrared and microwave. Due to its special position in the electromagnetic spectrum, terahertz science and technology is currently a very important interdisciplinary frontier field. The unique properties of terahertz waves make it have broad practical prospects in the fields of basic research in biology, medicine, physics, chemistry, and electronic information, as well as in technical fields such as material research, communication information, environmental science, spectroscopy, and national security. and important scientific research value. At the same time, teraher...

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Problems solved by technology

[0007] However, with the increase of the broadside of the sine wave slow wave structure, the longitudinal electric field distribution of this slow wave structure will become more dispersed, resulting in a very small average coupling impedance in the band-shaped electron beam passing region, making the return wave oscillator It is difficult to vibrate, and the interaction efficiency is low; at the same time, due to the increase of the broad side, the depth ratio of the structure becomes larger, resulting in an increase in the difficulty of microfabrication

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