Microwave modulation multi-electron-beam cold cathode electronic gun with controllable phases

A phase modulation, multi-electron injection technology, applied in the field of electron guns, can solve the problems of high cathode temperature, unsuitability, device damage, etc.

Inactive Publication Date: 2014-02-26
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electron gun components in the above-mentioned electric vacuum radiation source devices occupy a pivotal position. The electron guns in traditional electric vacuum radiation source devices generally use a thermal emission cathode system. After decades of development, the thermal emission cathode process has been very mature and is widely used in Among all kinds of electric vacuum radiation source devices, the thermal emission cathode has the following significant disadvantages: complex structure, high cost, and the cathode system is composed of various metal and ceramic components. Since the hot cathode works in a high temperature environment of thousands of degrees, the heating in the cathode The filament used is easy to break or short circuit, resulting in damage to the device; on the other hand, because it takes a long time to heat up during work, it not only increases the complexity of the system, but also reduces the system efficiency; One of the main reasons why vacuum radiation source devices are difficult to integrate
Therefore, this type of cold cathode electron gun can only be used for devices such as cold cathode electric light sources and pixel tubes (displays) whose electron injection frequency is much lower than microwave frequencies; it is not suitable for integrated miniature electric vacuum radiation source devices, and because The phase of each radiation source is difficult to match, and the phase coherence will cause the device to fail to work, so it cannot be used in integrated microwave source devices with multiple miniature electric vacuum radiation sources

Method used

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  • Microwave modulation multi-electron-beam cold cathode electronic gun with controllable phases
  • Microwave modulation multi-electron-beam cold cathode electronic gun with controllable phases
  • Microwave modulation multi-electron-beam cold cathode electronic gun with controllable phases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take the multi-injection cold-cathode electron gun used for the miniature electric vacuum radiation source in the 3 mm frequency band as an example: the inner cavity width of the electron gun housing 1 is 5 mm, the long side is 10 mm, the height is 5 mm, the wall thickness is 2 mm, and the inner wall chamfers the arc curvature For radius 1mm, material is 99 # Ceramic, its lower end is sealed with the base 1-1, and its upper end is connected with the resonant system to form a sealed vacuum chamber when in use, and the vacuum degree can reach 10 -5 Pa; base 1-1 material is also 99 # Ceramic, (length x width x thickness) 14 x 7 x 4mm. The microwave input layer 3 (length×width×thickness) is 20×2×0.25mm. There are three through holes in the microwave input layer, and the (length×width×thickness) of each hole is 2×1.8×0.25mm. This implementation case According to the requirements, the phases of the microwaves in the microwave input layer are the same when they pass through ...

Embodiment 2

[0023] Still take the multi-injection cold-cathode electron gun for the miniature electric vacuum radiation source of the 3 mm frequency band as an example: wherein the electron gun housing 1, the base 1-1, the electron injection output hole 2-1, the interaction chamber 3-1, the cold cathode 5. Its structure and size are the same as those of Embodiment 1; this embodiment requires that the phases of microwaves passing through the first and third interaction cavities be the same, and that the phases of microwaves passing through the second interaction cavity are the same as those of the first and third interaction cavities. The phase of the interaction cavity is opposite. Through the simulation of the three-dimensional electromagnetic simulation software "CST MICROWAVE STUDIO", it is obtained that the center distance between the holes in the microwave input layer 3 is 3.86mm, so the arrayed electron injection and output holes on the upper electrode plate 2 2-1 The distance betwee...

Embodiment 3

[0026] Take the multi-injection cold-cathode electron gun used for the miniature electric vacuum radiation source in the 3 mm frequency band as an example: the inner cavity width of the electron gun housing 1 is 5 mm, the long side is 24 mm, the height is 5 mm, the wall thickness is 2 mm, and the inner wall chamfering arc curvature For radius 1mm, material is 99 # Ceramic, its lower end is sealed with the base 1-1, and its upper end is connected with the resonant system to form a sealed vacuum chamber when in use, and the vacuum degree can reach 10 -5 Pa; base 1-1 material is also 99 # Ceramic, (length×width×thickness) 28×7×4mm; microwave input layer 3 (length×width×thickness) 34×2×0.25mm, made of polytetrafluoroethylene, six through holes are set in the microwave input layer , the (length×width×thickness) of each hole is 2×1.8×0.25mm. The requirement that the phases are the same and opposite to the first and third phases when acting on the cavity; therefore, through the sim...

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Abstract

The invention belongs to a cold cathode electronic gun matched with integratable electronic vacuum radiation source devices. The cold cathode electronic gun comprises an electronic gun shell, a base of the electronic gun shell, an upper electrode plate, a lower electrode plate and a microwave input layer, wherein through holes of which the number is the same as the number of cold cathodes are formed in the microwave input layer. The through holes in the microwave input layer, the upper electrode plate and the lower electrode plate jointly form interaction cavities with the corresponding number. The cold cathodes are embedded into the lower electrode plate at the bottoms of the corresponding interaction cavities respectively. A set of array electron beam output holes of which the sizes are all smaller than microwave lengths are formed in the upper electrode plate area which is over against each interaction cavity. The cold cathode electronic gun has the advantages that beam wave interaction space is small, microwaves of different frequencies can be fed in according to requirements to modulate emission currents of the multiple cold cathode to generate multiple electron beams of different modulation frequencies and strength, the microwave modulation phase of each electron beam is controllable, multiple electron beam sources can be provided for integrated miniature electronic vacuum radiation source devices, output power is high, and the application range is effectively expanded.

Description

technical field [0001] The invention relates to an electron gun which can be integrated with an electric vacuum radiation source device, in particular to a phase-controllable cold-cathode electron gun which can adjust the frequency of feeding microwaves to generate multiple electron beams with different modulation frequencies. Background technique [0002] As an indispensable core device of military electronic systems such as radar, electronic countermeasures, and space communication, microwave electric vacuum radiation source devices have been widely valued. The electron gun components in the above-mentioned electric vacuum radiation source devices occupy a pivotal position. The electron guns in traditional electric vacuum radiation source devices generally use a thermal emission cathode system. After decades of development, the thermal emission cathode process has been very mature and is widely used in Among all kinds of electric vacuum radiation source devices, the therma...

Claims

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Application Information

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IPC IPC(8): H01J19/24
Inventor 袁学松鄢扬
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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