High power box-shaped window

Abstract

The invention relates to a high power box-shaped window which is characterized by improving and innovating the traditional structure and adopting boron nitride ceramic with low AgCuTi vacuum brazing dielectric constant, little dielectric loss and good high temperature heat conduction; thin-wall oxygen-free copper material which is externally sheathed with a protecting metal molybdenum ring is adopted by sealing-in circular waveguide; two effective ways of air cooling and water cooling can be selected when in cooling; therefore, the problems that the traditional high power window is hard to seal, high in power consumption, high in temperature after long time work and difficult in heat dissipation.

Description

technical field [0001] The invention belongs to the field of microwave electronic device manufacturing, in particular to a high-power box-shaped energy transmission window. Background technique [0002] High-power vacuum microwave devices are electric vacuum devices that utilize the interaction of electron beams and microwave electromagnetic fields to amplify microwaves. It has the characteristics of high peak power, high average power and low cost. It is the heart of various microwave electronic systems. Today in the 21st century, it is still an irreplaceable source of microwave power. The reliable operation of microwave electric vacuum devices requires a high-vacuum internal environment. The energy transmission window appears to solve the contradiction between high-frequency energy output and maintaining the high-vacuum performance of the device itself. Frequency characteristics, reliability and life have an important impact. [0003] For a long time, high-power vacuum d...

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Problems solved by technology

First of all, the thermal expansion coefficient of the medium is relatively small. In order to obtain a highly reliable sealing structure, the metal generally uses Kovar or molybdenum-copper-nickel metal with a thermal expansion coefficient similar to that of the medium. Because the surface resistance of these two metals is relatively large, the power is increased. In the long-term working state, the temperature of the energy transmission window will continue to rise, which will bring great harm to the stability of the structure: secondly, the heat conductivity of the medium is average, and the heat generated cannot be quickly Conducted out, thus exacerbating the rise of window temperature; finally, Al 2 o 3 The relative dielectric constant of ceramics is relatively large, which increases the equivalent loading capacitance and narrows the frequency band. Although glass has a lower relative dielectric constant and the frequency band can be wider, its power and heat resistance are very low, and it is easy to shock Explosion when piercing or brazing

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