CN2450791Y

CN2450791Y - High power microwave window of conic change structure

Info

Publication number: CN2450791Y
Application number: CN00260439U
Authority: CN
Inventors: 刘铁山; 丁耀根; 粟亦农; 卢玉华; 阎旭
Original assignee: Institute of Electronics of CAS
Current assignee: Institute of Electronics of CAS
Priority date: 2000-11-27
Filing date: 2000-11-27
Publication date: 2001-09-26
Anticipated expiration: 2010-11-27

Abstract

The utility model relates to a high power microwave window of conic change, which comprises a rectangular waveguide (1), a dielectric sheet (3) and a metallic dielectric sealing and connecting segment (4). Both sides of the dielectric sheet (3) are provided with a conic transforming segment (2). The utility model adopts the microwave window of a conic change structure, effectively reduces damage of the microwave window caused by multipactor, therefore, increases high power bearing capability of the microwave window, and prolongs service life of the microwave window.

Description

Novel awl becomes structure High-Power Microwave window

The utility model belongs to electron tube, particularly the High-Power Microwave window.

The High-Power Microwave window mainly is used in the neighborhood systems such as high-power microwave tubes, radar and accelerator, as the High-Power Microwave element of isolating microwave transmission system gas with various pressure.Generally require microwave window to have certain microwave transmission characteristic, also require to have certain mechanical strength and vacuum seal characteristic simultaneously.Under the High-Power Microwave transmission conditions, microwave window damage often occurs and resembles, and this has just limited the raising of microwave energy in the microwave transmission system.

The window dielectric surface produces strong multipactor, and the High-Power Microwave window is damaged, and is the major obstacle that restriction High-Power Microwave window through-put power improves.The experiment of High-Power Microwave window shows that at high-peak power, low work is than under the microwave pulse condition, and along with the raising of microwave peak power, many tiny honey comb like pits and pitting can appear in the surface of window dieelctric sheet vacuum one side.Along with the operating time lengthening, pitting deepens greatly gradually, causes perforation to damage at last.Under the condition of high-peak power high working ratio, the damage of microwave window often shows along breaking on the strongest direction of dieelctric sheet surface high frequency field intensity.This is because the dieelctric sheet surface produces before the more serious tiny pockmark, and the dieelctric sheet surface local is overheated, causes that thermal stress increases, and causes window to burst.

The purpose of this utility model provides a kind of High-Power Microwave window that becomes structure of boring, and makes TE in the rectangular waveguide (1) ₁₀Mould carries out the transition to the TE in the circular waveguide (2) ₁₁In the process, the axial electric field component weakens, and alleviates multipactor effectively and causes destruction to window, transmits high-power ability and useful life thereby improved microwave window.

Main feature of the present utility model is that awl uprises the power microwave window and comprises rectangular waveguide section (1), dieelctric sheet (3), metal medium sealing-in section (4), in dieelctric sheet (3) both sides one taper transforming section (2) is arranged.

The utility model adopts awl to become the structure microwave window, alleviates the microwave window that multipactor causes effectively and damages, and bears high-power ability thereby improved microwave window, and prolongs microwave window useful life.

Fig. 1 is conventional microwave window structure.(1) is the rectangular waveguide section among the figure, and (2) are the circular waveguide sections, and (3) are dieelctric sheets.

Fig. 2 is that awl uprises power microwave window structure.(1) is the rectangular waveguide section among the figure, and (2) are the pyramidal structure sections, and (3) are dieelctric sheets, and (4) are the metal to ceramic sealing sections.

On the surface of High-Power Microwave window, be easy to produce the secondary electron doubling effect.In window vacuum dieelctric sheet one side, some free electronics are under the radio-frequency field effect, the dielectric surface of bombardment window, because secondary electron yield δ＞1 of window materials, pound δ secondary electron doubly, secondary electron absorbs energy in radio-frequency field, add the electromagnetic field of high frequency effect outside down, returns again and bangs to microwave window dieelctric sheet surface.The result produces δ ²Times secondary electron, circulation repeatedly, the secondary electron stream of bombardment window increases rapidly by exponential manner, makes the window surface heat and produces glow discharge, causes the damage of microwave window.Especially under the condition of high working ratio, the secondary electron doubling effect is just more serious.

As everyone knows, at rectangular waveguide and circular waveguide transmission TE ripple, axially (on the microwave transmission direction) electric field component is zero.But in Fig. 1 microwave window structure, rectangular waveguide carries out the transition to circular waveguide at the interface, produce the border discontinuity, cause the bending of radio-frequency field power line, produce the axial electric field component, make electronics free in the vacuum obtain the axially kinetic energy of bombardment window, through-put power is big more, the electronic kinetic energy of bombardment window is big more, just easy more damage of microwave window.

The utility model adopts novel awl to become structure, connects rectangle and garden shape waveguide, makes it form slow boundary face and changes, and the radio-frequency field axial component is reduced, and the electronic kinetic energy of bombardment window is little, effectively improves the ability that microwave window bears power.Concrete structure is for to have a taper transforming section (2) in dieelctric sheet (3) both sides.The awl varied angle α of taper transforming section (2) is 50 °～60.The hard solder sealing-in is adopted in metal medium sealing-in place, for example, and spelter solder.The dieelctric sheet surface vacuum is partly used the material processed of secondary emissionratio＜1.General awl becomes the design of structure microwave window, should adopt the three-dimensional software calculation procedure to finish according to different instructions for uses.

Claims

1. a novel awl uprises the power microwave window, comprises rectangular waveguide section (1), dieelctric sheet (3), metal medium sealing-in section (4), it is characterized in that in dieelctric sheet (3) both sides one taper transforming section (2) being arranged.

2. by the described High-Power Microwave window of claim 1, the awl varied angle α that it is characterized in that described taper transforming section (2) is 50 °～60 °.

3. by the described High-Power Microwave window of claim 1, it is characterized in that metal medium sealing-in place, adopt the hard solder sealing-in.

4. by the described High-Power Microwave window of claim 3, it is characterized in that described hard solder is a spelter solder.

5. by the described High-Power Microwave window of claim 1, it is characterized in that the dieelctric sheet surface vacuum partly uses the material processed of secondary emissionratio＜1.