An Injection-Wave Interaction Structure for Multi-Injection High-Order Mold Based on Cold Cathode

Abstract

The invention relates to the field of microwave, millimeter wave and terahertz frequency band electric vacuum devices, specifically a multi-injection high-order mold injection-wave interaction structure based on cold cathodes, which is used to solve the problem that the injection-wave interaction structure in the prior art cannot effectively improve the output A question of power and efficiency. The invention includes a high-frequency interaction structure, a cold cathode electron gun sealedly connected to one end of the high-frequency interaction structure, and an output system sealed to the other end of the high-frequency interaction structure. It is divided into a plurality of interaction gaps with the longitudinal metal partition, and the interaction gaps are connected to each other through coupling joints; the present invention uses the function of the metal partition to suppress the generation of the basic mode and work under the high-order mode. The interaction between multiple electron beams and high-order modes is realized, the beam-wave interaction area is enlarged, and the output power and efficiency are improved.

Description

technical field [0001] The invention relates to the field of electric vacuum devices in the microwave, millimeter wave and terahertz frequency bands, in particular to a beam-wave interaction structure involving multiple electron beams of cold cathodes and working in a high-order mode. Background technique [0002] Microwave and millimeter wave electric vacuum devices, as the indispensable core devices of military electronic systems such as radar, electronic countermeasures, and space communications, have been widely valued. Extending the traditional microwave tube to the millimeter wave band, submillimeter wave band and terahertz frequency band is still the direction of people's continuous efforts, and great achievements have been made. Millimeter wave traveling wave tubes, klystrons, return wave tubes and magnetrons have all reached a very high level. Although great achievements have been made in the development of conventional microwave tubes to the millimeter-wave band, ...

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Problems solved by technology

[0003] Electron guns in traditional electric vacuum devices generally use a thermal emission cathode system. After decades of development, the thermal emission cathode process is very mature and is widely used in various electric vacuum devices. However, the thermal emission cathode has the following significant disadvantages: complex structure , the cost is high, and the cathode system is composed of a variety of metal and ceramic components. Since the hot cathode works in a high temperature environment of thousands of degrees, the filament used for cathode heating is easy to break and short circuit, resulting in damage to the device; Heating for a long time not only increases the complexity of the system, but also reduces the efficiency of the system; in addition, due to the complex structure of the hot cathode, the high temperature of the cathode is also one of the main reasons why the integration of electric vacuum radiation source devices is difficult

[0004] The high-frequency interaction system of the electric vacuum device plays a decisive role in the output power and efficiency of the whole tube as the place where the injection wave interacts. However, most of the high-frequency systems of the electric vacuum device developed in ordinary times work in the fundamental mode. Although this It is conducive to single-mode output and reduced mode competition, but the further the development of higher frequency bands, the smaller the size of the device, and the corresponding reduction in output power and efficiency

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