High frequency design method for ultra-wideband helix traveling wave tube

A technology of high-frequency structure and design method, which is applied in the direction of traveling wave tubes, circuit components of transit-time electronic tubes, etc., and can solve problems such as harmonic suppression characteristics that need to be improved

Active Publication Date: 2016-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, the output power and harmonic suppression characteristics of the high-frequency structure of the existing ultra-wideband helical traveling wave tube in the range of 4.5-18 GHz need to be improved

Method used

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  • High frequency design method for ultra-wideband helix traveling wave tube
  • High frequency design method for ultra-wideband helix traveling wave tube
  • High frequency design method for ultra-wideband helix traveling wave tube

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0033] This embodiment provides a high-frequency structure design method for a 4.5-18GHz ultra-broadband helical traveling wave tube, wherein the high-frequency structure adopts a high-frequency structure of fan-shaped fins and rectangular clamping rods, such as figure 1 shown; its design method includes the following steps:

[0034] Step 1. Calculate the inner diameter of the helix according to the demand index

[0035] In this embodiment, the demand indicators for the ultra-broadband helical TWT of 4.5-18 GHz are: the output power is greater than 100 W, the total efficiency is not less than 30%, the working voltage is 6000 V, and the second harmonic of 4.5 GHz is not greater than -5 dBc;

[0036] The electron beam velocity v is calculated by the following formula 0 :

[0037] v 0 = ...

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Abstract

The invention relates to a high-frequency structure design method for an ultra-wide band helix traveling wave tube, belonging to the technical field of ultra-wideband traveling wave tubes. The method comprises the following steps: firstly determining the inside diameter of a helical line; then, under the premise that the inside diameter remains unchanged and through the adjustment of the pitch and the inside diameter of a wing sheet, making high coupling impedance one of the high-frequency characteristics of an input section and enabling dispersion characteristic of an output section to realize super anomalous dispersion so that the pitches and the inside diameters of wing sheets of the input section and the output section can be determined respectively. For the characteristic of high coupling impedance, a helical forward wave can be more synchronized with an electronic beam, greatly increasing the output power. For the characteristic of super anomalous dispersion at the output section, the synchronization between a higher harmonic wave and an electronic beam is destroyed, thus achieving a better harmonic suppression effect. The high frequency structure of the invention can improve the output power and suppress harmonic waves, and the output power is more than 115W in the frequency range of 4.5 to 18GHz and the second harmonic wave at 4.5GHz is less than -5dBc.

Description

technical field [0001] The invention belongs to the technical field of ultra-broadband traveling wave tubes, and relates to a high-frequency structure design method for ultra-broadband helical traveling wave tubes, especially for 4.5-18GHz ultra-broadband helical traveling wave tubes. Background technique [0002] Ultra-wideband traveling wave tubes refer to traveling wave tubes covering a wide range of frequency bands. As the final power amplifier, it still plays a huge role in electronic countermeasures, communications, radar, precision guidance and remote sensing detection. The 4.5-18GHz ultra-wideband helical traveling wave tube can be used in jamming systems such as airborne, vehicle-mounted and ship-borne, and has broad application prospects in future electronic warfare. In recent years, scholars at home and abroad have also carried out a lot of research and testing on the ultra-broadband aspects of traveling wave tubes. The TH4443 traveling wave tube developed by THal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J25/34H01J23/26
CPCH01J23/26H01J25/34
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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