Spiral line of space traveling-wave tube and design method thereof
A helix and traveling wave tube technology, which is applied in the nonlinear field of space traveling wave tubes, can solve the problems of incompatibility between the helix and the input window, group delay distortion suppression, etc., so as to improve the initial pitch value, reduce reflection, The effect of gain optimization
Active Publication Date: 2019-04-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0006] In view of the above-mentioned problems or deficiencies, in order to solve the problem that the suppression of group delay distortion of the existing space traveling wave tube and the matching between the helix and the input window cannot be taken into account, the present invention provides a helix of a space traveling wave tube and its design method
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[0023] Taking an L-band space traveling wave tube with a working frequency band of 1.535-1.605 GHz and adding a group delay suppression structure as an example, the present invention will be further described in conjunction with the accompanying drawings. The total length of the input helix of the TWT is 164 mm, and before adding the group delay suppression structure, it has only a uniform helical segment, and the average pitch value of the uniform helical segment is 1.2 mm.
[0024] (1) Simulate the TWT after adding the group delay suppression structure.
[0025] Under the initial structure, keep the length of the input helix unchanged, start from the initial end of the input helix, change a section of it into a positive gradient helix segment, the length of the gradient is selected as 25% of the input helix, and the beginning of the gradient segment The pitch value is 65% of the pitch of the input uniform spiral segment. After final optimization, the length is taken as 45mm...
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The invention belongs to the technical field of space traveling-wave tube nonlinearity and relates to a spiral line of a space traveling-wave tube and a design method thereof. Firstly, one section ofthe initial end of an input spiral line is changed into a normal gradual change spiral line section, so that an inhibiting effect is played on group delay distortion; then, a uniform spiral section isadded in the front of the added normal gradual change spiral section, so that the initial pitch value of the input spiral line is increased while the group delay inhibition effect is ensured; finally, the loss gain is compensated by extending the length of the uniform spiral section of the first section of an output spiral line. The spiral line provides a new way for group delay inhibition of anexisting space traveling-wave tube, optimizes the gain of the whole space traveling-wave tube, and meanwhile improves the initial pitch value of the input spiral line, thereby improving the matching of the spiral line and an input window and reducing the reflection of input electromagnetic waves.
Description
technical field [0001] The invention belongs to the field of nonlinear technology of space traveling wave tube, and relates to a helix of space traveling wave tube and a design method thereof. Background technique [0002] Space traveling wave tubes are the core components used in various satellites, spacecraft, radar and electronic countermeasure systems, and their performance indicators affect the pros and cons of various systems. With the rapid development of my country's aerospace industry, there is a very urgent demand for the number and performance of space traveling wave tubes. [0003] However, the space traveling wave tube is not a linear amplifier, and its nonlinear working process will lead to various nonlinear characteristics, which will have a negative impact on satellite systems and radar systems. Among them, the group delay distortion will seriously affect the transmission delay of the signal, greatly increase the bit error rate of the system, and thus have a...
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IPC IPC(8): H01J23/27
CPCH01J23/27
Inventor 胡玉禄邓文凯胡权朱小芳杨中海李斌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA