A Single-sided Folded Waveguide Slow-Wave Structure for Flyback Wave Oscillators

Abstract

The invention discloses a one-side folded waveguide slow wave structure for a backward wave oscillator. Curved waveguides on one side of a folded waveguide are arranged in symmetrical positions along a midline. The one-side folded waveguide slow wave structure particularly structurally comprises a straight waveguide array consisting of a plurality of straight waveguides and a plurality of curved waveguides, wherein every two adjacent straight waveguides are connected via one curved waveguide to form a periodic structure; and an electron beam channel penetrates through the straight waveguide array. According to the one-side folded waveguide slow wave structure, the curved waveguides on one side are transferred to the symmetric positions along the midline, so that fundamental waves of the slow wave structure are forward waves; and the backward wave oscillator can achieve appropriate working voltage and higher coupling impedance simultaneously by using the one-side folded waveguide slow wave structure.

Description

technical field [0001] The invention relates to the field of microwave vacuum electronic devices, in particular to a single-side folded waveguide slow-wave structure used for a return-wave oscillator. Background technique [0002] The return wave oscillator is a microwave vacuum electronic device, which uses the interaction between the return wave on the slow wave structure and the electron beam to generate microwave oscillations, and can realize electronic tuning in a wide frequency band. For terahertz science and technology and related applications, the return wave oscillator is a kind of radiation source with a high degree of practicality. As the operating frequency of microwave vacuum electronic devices increases to short millimeter waves (40GHz-300GHz) or even terahertz (300GHz-3000GHz), folded waveguides have become the most commonly used slow-wave structures, such as figure 1 As shown, the U-shaped curved folded waveguide slow wave structure is a periodic structure i...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a single-sided folded waveguide slow-wave structure for the back-wave oscillator to solve the problem of low coupling impedance of the folded-waveguide slow-wave structure in the back-wave oscillator in the prior art

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