Cold cathode electronic gun modulated by microwave

Abstract

The invention relates to a cold cathode electronic gun used in cooperation with a vacuum radiation source device. The cold cathode electronic gun comprises an electronic gun shell and a base of the electronic gun shell. The cold cathode electronic gun is provided with an upper electrode plate with array-type electron beam output holes, a lower electrode plate and a cold cathode, and further provided with a microwave input layer which is provided with an interaction cavity and arranged between the upper electrode plate and the lower electrode plate. Due to the fact that the microwave input layer is additionally arranged between the upper electrode plate and the lower electrode plate of a traditional cold cathode electronic gun, a cavity formed above the cold cathode in the middle section of the microwave input layer is used as the interaction cavity, the cold cathode is embedded in the bottom of the interaction cavity, the array-type electron beam output holes which are smaller than the microwave length in size are formed in the position, right opposite to the interaction cavity, of the upper electrode plate, and therefore the cold cathode electronic gun has the advantages of being small in space of the beam wave interaction cavity, low in power consumption, capable of being integrated, small in size, high in response speed and capable of feeding in microwaves with different frequencies as needed to modulate the current transmitted by the cold cathode so as to generate electron beams with different frequencies and strengths, providing an electron transmitting source for the mini-type electron vacuum device, effectively expanding the application range and the like.

Description

technical field [0001] The invention relates to an electron gun which can be integrated into an electric vacuum radiation source device, in particular to a cold-cathode electron gun which can adjust the frequency of feeding microwaves to generate 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 thermal emission cathode has the f...

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 operation, it not only increases the complexity of the system, but also reduces the system efficiency; One of the main reasons why radiation source devices are difficult to integrate

Therefore, this type of cold-cathode electron gun is not suitable for integrated miniature electric vacuum radiation source devices, and can only be used for devices such as cold-cathode electric light sources, pixel tubes (displays), etc., whose electron injection frequency is much lower than microwave frequencies.

Images