Multi-ring electron beam radiation source based on cold cathode

Abstract

The invention belongs to the field of microwave, millimeter wave and terahertz wave band electric vacuum, and provides a multi-ring electron beam radiation source based on a cold cathode. The multi-ring electron beam radiation source comprises a high-frequency beam-wave interaction unit, a cathode substrate with one sealed and fixed end, an anode substrate with the other sealed and fixed end, and an output system device, wherein the high-frequency beam-wave interaction unit is designed in a way that a beam-wave interaction space is divided into Q + 1 electron beam channels by Q cylindrical metal partition plates which are distributed in a nested manner; and the nested cold cathode circular ring emitter on the surface of the cathode substrate simultaneously emits electrons to the corresponding nested annular sleeve high-frequency beam-wave interaction unit, so that the generation and stable transmission of multiple annular electron beams are ensured. The beam-wave interaction unit not only can work in a high-order mode, but also can inhibit the generation of a competition mode, thereby enlarging the beam-wave interaction space, and enabling the output power and efficiency of a radiation source to be greatly improved; and the integration degree of the electric vacuum device is greatly improved.

Description

technical field [0001] The invention belongs to the electric vacuum field of microwave, millimeter wave and terahertz bands, relates to a vacuum electron radiation source, and specifically provides a cold-cathode-based annular multi-electron injection radiation source working in a high-order mode. Background technique [0002] With the advancement of science and technology, microwave and millimeter wave radiation sources have developed very mature and stable devices, which are vacuum electronic devices. As an indispensable core device for electronic equipment such as radar and electronic countermeasures, it has attracted wide attention. The vacuum electron radiation source has the advantages of high power and high frequency, which makes it widely used in radar, communication, particle acceleration, etc.; it is the endeavor of modern scholars to expand the traditional microwave tube to the millimeter wave and terahertz wave bands. Direction has also achieved certain results. ...

AI Technical Summary

Problems solved by technology

However, on the way to continue research, we will encounter some principled limitations: microwave tubes are developing towards high-frequency bands, even terahertz bands. Since the higher the frequency, the smaller the wavelength, the size of the device must also become smaller and smaller. On the one hand, it will bring difficulties in manufacturing and assembly. On the other hand, it will also make the space and time of the interaction between the electron beam and the high-frequency field smaller and smaller, making the speed modulation and density modulation of the electron beam insufficient. , the device output power will be greatly limited

[0003] In traditional electric vacuum devices, because of the widespread use of hot cathodes, the development of vacuum electronic devices has been greatly promoted; however, hot cathodes have some significant disadvantages as electron emission sources: they need to be heated to a higher temperature, the structure is complex, and the processing cost High, too high heating temperature will cause the heater filament to break, the device to be damaged, and the start-up time to be long, etc.

[0004] The rapid development of solid-state radiation source devices has challenged vacuum devices in many fields. Their small size, low operating voltage, operation at room temperature, and easy integration make them very advantageous; however, solid-state devices also have some limitations. Such as poor anti-interference performance, harmful response to input radiation, and low output power in the millimeter wave and terahertz frequency bands, etc.

Images