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Deformation terahertz folded waveguide slow wave circuit with decentric inner arc and outer arc

A folded waveguide and slow-wave circuit technology, which is applied to the coupling device of transit-time electron tubes, etc., can solve the problem of limiting terahertz technology, low coupling impedance of folded-waveguide slow-wave circuits, output power and interaction of terahertz traveling wave tubes. Low efficiency and other problems, to achieve the effect of improving output power and improving the efficiency of injection-wave interaction

Active Publication Date: 2019-07-19
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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  • Application Information

AI Technical Summary

Problems solved by technology

According to the known experimental results of terahertz folded waveguide traveling wave tubes developed at home and abroad, due to the low coupling impedance of folded waveguide slow wave circuits, the output power and interaction efficiency of terahertz traveling wave tubes are low. Also limits the practical application of terahertz technology

Method used

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  • Deformation terahertz folded waveguide slow wave circuit with decentric inner arc and outer arc
  • Deformation terahertz folded waveguide slow wave circuit with decentric inner arc and outer arc
  • Deformation terahertz folded waveguide slow wave circuit with decentric inner arc and outer arc

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Embodiment 1

[0026] Such as figure 2 As shown, a deformed terahertz folded waveguide slow-wave circuit with inner and outer arcs not concentric, including a folded waveguide 1 and an electronic channel 2, the folded waveguide 1 is formed by periodically bending a rectangular waveguide into an S shape along the electric field surface toward the axial direction , and a small section of straight waveguide h is added in the direction perpendicular to the axial direction 1 , the center of the outer arc of the corresponding folded waveguide 1 moves outward δ 1 distance, the center of the inner arc moves inwards δ 2 distance, where h 1 = δ 1 +δ 2 , that is, the centers of the inner and outer arcs are not at the same coordinate point, and the inner and outer arcs are no longer concentric. In this way, the cavity of the folded waveguide 1 increases laterally, and the strength of the electromagnetic field in the cavity increases. This deformed structure greatly improves the coupling impedance ...

Embodiment 2

[0031] This embodiment is on the basis of embodiment 1:

[0032] In the G-band frequency, set the structure size (unit: mm): a=0.76, b=0.15, r c = 0.075, h 1 =0.02, δ 1 =0.02, δ 2 =0.02,R b =0.12, where a is the length of the straight waveguide broadside of the folded waveguide 1, and the deformed terahertz folded waveguide slow-wave circuit of the embodiment 1 is modeled using three-dimensional electromagnetic simulation software. After simulation and calculation, the results of its dispersion characteristics, coupling impedance and attenuation constant are obtained, and compared with the high-frequency characteristic parameters of the conventional undeformed folded waveguide slow-wave circuit, such as Figure 4-6 shown.

[0033] From Figure 4Compared with the conventional folded waveguide, the normalized phase velocity of the deformed folded waveguide does not change much, indicating that the operating bandwidth of the slow-wave circuit does not change significantly, ...

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Abstract

The invention discloses a deformation terahertz folded waveguide slow wave circuit with decentric inner arc and outer arc. The deformation terahertz folded waveguide slow wave circuit comprises a folded waveguide and an electronic passage, wherein the folded waveguide is formed by periodically bending a rectangular waveguide along an electric field surface towards an axial direction to form an S shape, a small segment of straight waveguide h1 is additionally arranged in a direction perpendicular to the axial direction, a circle center of the outer arc of the corresponding folded waveguide outwards moves by a distance of Delta1, a circle center of the inner arc of the corresponding folded waveguide inwards moves by a distance of Delta2, the circle centers of the inner arc and the outer arcare not at the same coordinate point, the inner arc and the outer arc are not concentric, h1 is equal to (Delta1+Delta2), and the electronic passage is arranged at a position of a middle-axis symmetric line of the folded waveguide and crosses with the folded waveguide in the axial direction. The deformation terahertz folded waveguide slow wave circuit can be applied to a high-frequency circuit ofa terahertz travelling wave tube, the standing wave mutual efficiency of the terahertz travelling tube can be improved, the output power of the whole tube is increased, and a solid device foundation is laid for application of a large-power terahertz travelling wave tube in a terahertz system.

Description

technical field [0001] The invention belongs to the technical field of microwave vacuum electronic devices, in particular to a slow wave circuit of a terahertz traveling wave tube amplifier. Background technique [0002] Due to its operating frequency bandwidth and high power output, terahertz traveling wave tubes have shown great potential in the application fields of terahertz technology such as high-resolution terahertz radar, long-distance high-speed communication and space detection, and have won the attention of Chinese and foreign researchers. widespread attention. [0003] The slow wave circuit in the traveling wave tube is the key core component of the beam-wave interaction in the traveling wave tube, and its performance design directly affects the output index of the traveling wave tube. When the frequency works to the terahertz band, the interaction circuit size of the TWT becomes very small. The helical traveling wave tube of the traditional circular electron b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J23/38
CPCH01J23/38
Inventor 雷文强蒋艺胡鹏宋睿黄银虎陈洪斌
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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