Gyrotron Traveling Wave Tube Coupling Input Structure

Abstract

The invention provides a novel gyro traveling-wave tube coupling input structure used for solving the problem that insertion loss of a traditional structure is large. The input structure comprises circular waveguides and rectangular waveguides vertically loaded onto the circular waveguides, the electron beam input section of each circular waveguide is provided with one or more rectangular grooves which are located in symmetric faces of the coupling input structure, the center distance between each rectangular groove and the section of the corresponding rectangular waveguide is (1 / 2+n) lambda, n is a positive integer, and lambda is the wavelength of a circular waveguide center frequency point TE11 module, the length and the width of each rectangular groove are determined according to the corresponding work frequency band and coupling, the depth of each rectangular groove is 1 / 8lambda'-3 / 8lambda', and lambda' is the wavelength of a TE10 module of the rectangular waveguide in the size corresponding to the corresponding rectangular groove. Insertion loss of input electromagnetic waves is effectively reduced, the input structure can work in wide frequency band ranges according to different needs by means of increase of the number of the rectangular grooves and adjustment of the structure parameters of the rectangular grooves, and is simple in structure and convenient to machine.

Description

technical field [0001] The invention belongs to the field of microwave vacuum devices, and relates to an input device for a vacuum cyclotron traveling wave tube, in particular to a coupling input device with broadband and low insertion loss. Background technique [0002] Microwave vacuum cyclotron amplification devices are devices that use the kinetic energy carried by moving electrons in vacuum to amplify microwave energy. The electron gun produces electron beams, and the electron beams interact with the high-frequency field in the high-frequency structure, and the kinetic energy of the electrons is converted into high-frequency field energy. Among them, the cyclotron traveling wave device can achieve high power output in a wide frequency band in the millimeter wave band, making it an important coherent radiation source in high-power microwave sources, and has been widely used in radar and communication systems. The main function of the coupling input structure is to effic...

AI Technical Summary

Problems solved by technology

However, this vertically connected structure can only convert half of the energy of the rectangular waveguide input electromagnetic waves into forward-transmitting electromagnetic waves to enter the high-frequency structure and interact with electron beams; at the same time, the other half of the input energy is converted into reverse-transmitting electromagnetic waves. The energy enters the input section of the electron beam and is absorbed by the absorbing medium loaded at the beginning of the input section of the electron beam, resulting in a very large insertion loss of the input electromagnetic wave of the coupling input structure.

If the insertion loss is too large, it is necessary to increase the output power requirements of the front-end, and the front-end is generally made of solid-state devices or traditional traveling wave tubes, the output power is very limited, and it is difficult to provide higher power; if the power combination is used, the cost is high, and the combination needs to control the phase , it is also difficult to achieve

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