Secondary harmonic inhibition method for broadband helix travelling wave tube

A second harmonic and helical technology, which is applied in the field of second harmonic suppression of broadband helical traveling wave tubes, can solve problems such as large second harmonic output, difficult control, and unsatisfactory effects

Active Publication Date: 2016-02-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • 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

Method used

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  • Secondary harmonic inhibition method for broadband helix travelling wave tube
  • Secondary harmonic inhibition method for broadband helix travelling wave tube
  • Secondary harmonic inhibition method for broadband helix travelling 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 and especially relates to a secondary harmonic inhibition method for a broadband helix travelling wave tube, and belongs to the technical field of broadband helix travelling wave tubes. Within a certain range, a travelling wave tube harmonic inhibition situation becomes greater if a distance between a fin to a center is reduced, however, the reduced distance will make the fin closer to a helix and might cause engineering machining troubles and many other potential troubles. Therefore, two different fin structures are adopted by an input segment and an output segment respectively, and the distance from a fin on the input segment to the center is made to be greater. Through the even and symmetric fin structure, a better harmonic inhibition effect is exhibited, and other factors in terms of the design of a travelling wave tube can be better weighed.

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