High-order backward-wave oscillation suppression structure for strip-shaped beam traveling-wave tube

Abstract

The invention discloses a high-order backward wave oscillation suppression structure for a strip beam traveling wave tube, and belongs to the technical field of microwave electronics and terahertz. The structure comprises a shell and rectangular gates arranged on the upper top face and the lower bottom face of an inner cavity of the shell in a staggered mode, the two side faces of the shell are each provided with a column of rectangular coupling waveguides which are the same in size and arranged periodically, and the two columns of rectangular coupling waveguides are staggered by half a slow wave period in the axis direction and are also designed in a staggered mode in the longitudinal direction. And one rectangular coupling waveguide corresponds to one rectangular cavity. By loading the staggered rectangular coupling waveguides on the two sides of the slow-wave structure, suppression and absorption of a high-order mode are synchronously realized on the premise of not influencing and not damaging a working mode.

Description

technical field [0001] The invention relates to the field of microwave electronics and terahertz technology, in particular to a high-order return wave oscillation suppression structure for a strip-shaped injection traveling wave tube Background technique [0002] In the fields of military confrontation, spaceborne or airborne communication, radar, etc., electric vacuum devices are considered to be the most practical and reliable solution. This is due to the unique characteristics of high power, high efficiency and high gain of electric vacuum devices. Among them, the traveling wave tube, as a kind of electric vacuum device, is especially suitable for electronic countermeasures, space-borne and vehicle-mounted communications because of its broadband and miniaturization characteristics unmatched by other devices. The latest research hotspot—ribbon beam traveling wave tube has larger current and power capacity than traditional cylindrical electron beam. Therefore, countries a...

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Problems solved by technology

However, the two schemes will inevitably weaken the working mode while absorbing the oscillation mode, resulting in a substantial decrease in the gain of the whole tube. In order to obtain sufficient gain, the number of cycles must be increased, which in turn leads to an increase in the size of the slow-wave structure and The difficulty of electronic transmission system design increases, which is not conducive to the development of miniaturization and millimeter wave devices

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