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Half-cycle staggered cosine end plane gate slow wave structure

A slow-wave structure and cosine technology, applied in the field of microwave vacuum electronic devices, can solve the problems of large high-frequency loss and increased high-frequency loss, and achieve the effects of reducing high-frequency loss, increasing cold bandwidth, and improving dispersion characteristics

Active Publication Date: 2016-05-11
NO 12 RES INST OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the terahertz frequency band, low-loss performance is very important, because high frequency means greater high-frequency loss, and at this time the surface roughness is getting closer to the skin depth, which increases the high-frequency loss to a certain extent

Method used

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  • Half-cycle staggered cosine end plane gate slow wave structure
  • Half-cycle staggered cosine end plane gate slow wave structure
  • Half-cycle staggered cosine end plane gate slow wave structure

Examples

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Effect test

example 1

[0031] A half-period interlaced cosine end-face grating slow-wave structure according to the present invention, the specific scheme structure size is as follows, the unit is mm: rectangular waveguide wide side length a=0.68, waveguide narrow side length b=0.64, geometric period p=0.4, cosine The grid body width w=0.1, the grid body height h=0.26, and the amplitude Ac of the cosine profile is 0.005. Use 3D electromagnetic software to simulate the slow wave structure of this example, and calculate the dispersion curve, axial coupling impedance and high frequency loss. The simulation results are as follows Image 6 , as shown in 7 and 8.

example 2

[0033] A half-period interlaced cosine end-face grating slow-wave structure according to the present invention, the specific scheme structure size is as follows, the unit is mm: waveguide wide side length a=0.68, waveguide narrow side length b=0.64, geometric period p=0.4, cosine grating Body width w=0.1, grid body height h=0.26, amplitude Ac of cosine profile is 0.01. Utilize three-dimensional electromagnetic software to simulate a half-period interlaced cosine face grating slow-wave structure of the present invention, and calculate the dispersion curve, axial coupling impedance and high-frequency loss, and the simulation results are as follows Image 6 , as shown in 7 and 8.

[0034] Image 6 The simulation results of the dispersion curve show that, compared with the rectangular end-face half-period interleaved double-grid slow-wave structure, the lower cut-off frequency and the upper cut-off frequency of the fundamental wave of the half-period interleaved cosine end-face d...

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Abstract

The invention provides a half-cycle staggered cosine end plane gate slow wave structure. The slow wave structure comprises a shell, multiple first gate bodies formed on the first edge of an inner cavity and multiple second gate bodies formed on the second edge, opposite to the first edge, of the inner cavity; the first gate bodies and the second gate bodies are arranged in a staggered manner along an axial line of the slow wave structure; electron beam channels are formed between the first gate bodies and the second gate bodies; and the slow wave structure is characterized in that the end planes, perpendicular to the axial line, of each first gate body and each second gate body are provided with cosine outlines on the sides of the electron beam channels. According to the slow wave structure, the high frequency loss of the low wave structure is lowered, and cold bandwidth is increased, so that the slow wave structure is suitable for improvement of terahertz efficiency and bandwidth.

Description

technical field [0001] The invention belongs to the field of microwave vacuum electronic devices, and in particular relates to a half-period interlaced cosine end face grating slow-wave structure. Background technique [0002] The slow-wave structure is mainly used in traveling-wave microwave vacuum electronic devices, and can also be used as a resonant cavity to expand interactive standing-wave devices. The effective interaction between injection waves belongs to the core part of microwave vacuum electronic devices. [0003] As the frequency increases to the terahertz band, the most commonly used slow-wave structures are greatly restricted in use due to technical problems such as processing and heat dissipation. Therefore, the exploration of new slow-wave structures has received extensive attention. At present, the half-period interleaved double-grid slow-wave structure proposed by researchers mainly at the University of California, Davis, is an important type of slow-wave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J23/28
CPCH01J23/28
Inventor 蔡军冯进军邬显平
Owner NO 12 RES INST OF CETC
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