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A Second Harmonic Suppression Method of Broadband Helical Traveling Wave Tube

Active Publication Date: 2017-06-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the harmonic injection technology can suppress the second harmonic to a certain extent, there are considerable difficulties in operation and it is not easy to control; when the traditional pitch jump technology suppresses the harmonic, the output of the second harmonic is generally too large, and the effect Neither is ideal

Method used

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  • A Second Harmonic Suppression Method of Broadband Helical Traveling Wave Tube
  • A Second Harmonic Suppression Method of Broadband Helical Traveling Wave Tube
  • A Second Harmonic Suppression Method of Broadband Helical Traveling Wave Tube

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Embodiment Construction

[0017] The technical scheme of the present invention will be further described in detail below in conjunction with the design of the 2-8GHz broadband helical traveling wave tube.

[0018] The design method for the sudden change of the fin structure and the positive jump of the pitch of the helical traveling wave tube includes the following steps:

[0019] (1) Determine the high-frequency structure of the broadband helical TWT

[0020] This scheme combines the 2-8GHz broadband helical traveling wave tube to analyze the influence of fin structure mutation on the second harmonic suppression. The working voltage is set to 4000V, the output power is 250W, the saturation gain is 40dB, and the total efficiency is 30%. Through the forward design, it can be roughly determined that the inner diameter of the helix is ​​about 1mm, and the optimal synchronous phase velocity is 0.106 to 0.108, and then the pitch can be calculated as 0.7mm. With reference to the physical parameters derived...

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Abstract

The invention discloses a method for suppressing the second harmonic of a broadband helical traveling wave tube, belongs to the technical field of broadband helical traveling wave tubes, and in particular relates to a method for suppressing the second harmonic of the broadband helical traveling wave tube. Within a certain range, reducing the distance from the fins to the center will make the harmonic suppression of the traveling wave tube better, but the reduction of the distance will make the fins closer to the helix, which may cause many other potential problems such as engineering processing. Trouble, so the present invention uses two different fin structures in the input section and the output section respectively, so that the distance from the fin to the center of the input section is larger. Compared with the uniform fin structure, it not only brings better harmonic Suppression effect, but also a better "trade-off" of other factors in the TWT design.

Description

technical field [0001] The invention belongs to the technical field of broadband helical traveling wave tubes, and relates to a method for suppressing the second harmonic of the broadband helical traveling wave tube. Background technique [0002] Compared with other microwave tubes, traveling wave tubes have the advantages of wide frequency band, high power, low noise and high efficiency, and have been widely used in communications, radar and especially electronic countermeasures. In recent years, electronic countermeasure technology has been paid more and more attention by various countries, which also puts forward higher requirements for traveling wave tubes: wider frequency band, higher power and greater efficiency. Helical traveling wave tubes are widely used in the technical field of broadband traveling wave tubes due to their relatively flat dispersion characteristics. [0003] The helical traveling wave tube is roughly composed of five parts: electron gun, slow wave ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/26H01J23/27H01J25/34
Inventor 胡玉禄王文胡权朱小芳李斌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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