Multi-extraction type TM10,1,0 mode coaxial coupling cavity output circuit

Abstract

The invention provides a multi-extraction type TM10,1,0 mode coaxial coupling cavity output circuit. The energy of electron beams is extracted through a plurality of separated and coupled TM10,1,0 mode coaxial coupling cavities, after the energy is converted into electromagnetic waves, the electromagnetic waves are coupled into an output circular waveguide in the axial direction through rectangular coupling holes and a mode conversion cavity, and the same-phase superposition of output electromagnetic waves is realized by adjusting the distance between the coaxial coupling cavities and the waveguide wavelength of the output circular waveguide. Each of the coaxial coupling cavities comprises several coaxial resonant cavities working in the TM10,1,0 mode, 10 electron beam channels for workingfrequency band electromagnetic wave cutoff are placed, each of the electron beam channels can allow one or more electrons to pass, that is at least 10 electron beams can be received, therefore, the power and efficiency of a device are improved, and the current density of the electron beams is reduced.

Description

technical field [0001] The invention relates to the field of electric vacuum microwave devices, and more specifically, relates to a multiple extraction type TM10,1,0 mode coaxial coupling cavity output circuit. Background technique [0002] The extended interaction device is a new type of vacuum electronic device that can achieve high power output in the millimeter wave or even terahertz band, mainly including the extended interaction klystron (EIK) and the extended interaction oscillator (EIO). The output circuit is an important part of the extended interaction device, which consists of a multi-gap coupled cavity, also called an extended interaction resonant cavity, and an output structure. The multi-gap coupling cavity is connected by a plurality of individual resonant cavities through a coupling structure. The electron injection channel passes through all the resonant cavities, provides a channel for electrons, and forms an interaction gap with each resonant cavity, so th...

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Problems solved by technology

[0004] Most of the current extended interaction devices mainly work in the fundamental mode, that is, the resonance mode with the lowest resonance frequency. For example, "a low-voltage extended interaction slow-wave device" proposed by Yin Yong et al., electron injection is concentrated in the center of the cavity, As the operating frequency increases to the terahertz (THz) band, the lateral size of the coupling cavity and the interaction gap gradually shrink, and the diameter of the electron beam channel also becomes very small to cut off the propagation of electromagnetic waves in the channel. Too small The electron beam channel will affect the passage rate of electrons, which will seriously affect the efficiency and life of the device

In the case that the diameter of the electron beam channel is reasonable, the output power and efficiency can only be increased by increasing the current of the electron beam, which greatly increases the current density of the electron beam, resulting in a very high cathode load of the electron gun, and also seriously shortens the device. life

At present, the electron gun cathode with high current density and long life is not yet mature, and it is difficult to produce electron beams with high current density and small diameter, so the current of electron beams cannot be increased without limit

[0005] In addition, the current traditional extended interaction output circuit adopts a single-stage design, that is, only one coupling cavity is used to extract the energy of the electron beam, and its output power is gradually saturated as the number of gaps included in the coupling cavity increases.

In addition, since the multi-gap coupling cavity introduces longitudinal resonant modes, the number of longitudinal modes is the same as the number of gaps, and the more the number of modes, the narrower the frequency interval between modes, so increasing the number of gaps will increase the risk of mode competition, resulting in device Unstable, so it is difficult to effectively improve output power and efficiency with a single-stage output circuit with a single coupling cavity

In general, the traditional coupling cavity output circuit has the disadvantages of small lateral size, high current density electron injection, low output power and low efficiency in the terahertz frequency band.

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