CN1812185A - Simple microwave window - Google Patents
Simple microwave window Download PDFInfo
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- CN1812185A CN1812185A CN 200510020245 CN200510020245A CN1812185A CN 1812185 A CN1812185 A CN 1812185A CN 200510020245 CN200510020245 CN 200510020245 CN 200510020245 A CN200510020245 A CN 200510020245A CN 1812185 A CN1812185 A CN 1812185A
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Abstract
This invention discloses a kind of simple output window. In the microwave window that is sealed with vacuum rubber band, dielectric sheet with metal layer replaces general dielectric sheet without metal layer and uses as window sheet. When dielectric window sheet with metal layer and rubber band are pressed firmly, it is also vacuum sealing functioned. The dielectric sheet with metal layer and window flange of slot positioned rubber band are firmly electric-contacted, it makes shielded rubber band influences electromagnetic field. The metal layer in dielectric window sheet corresponding waveguide inner cross section part is eat off beforehand so as to ensuring that microwave can pass. When using dielectric sheet without metal layer as window sheet, the coefficient of standing wave increases because the existence of rubber band equivalently increases the size of dielectric sheet. In order to decrease the coefficient of standing wave, the size of window sheet must be decreased. It makes rubber band can not be pressed firmly. This invention is simple, low-cost and low-wasting. The coefficient of standing wave is small.
Description
Technical field
The invention belongs to microwave technical field, it is particularly related to the High-Power Microwave technology.
Background technology
Microwave window is the important component part of microwave electron tube, on need vacuumizing or fill the microwave component of special low-pressure gas, some also need to use microwave window, its role is to when guaranteeing that components and parts inner vacuum or low-pressure gas state are not destroyed by outside atmosphere, can allow microwave pass through smoothly.Obviously, be that air-tightness is good, lossy microwave is low to the basic demand of microwave window, standing-wave ratio is little.Microwave window in the traditional microwave pipe all adopts microwave low-loss dielectric materials such as pottery, jewel to make window, makes with the mode of the direct soldering of forms structural metallic materials, and its sealing is very high, can holding tube interior 10
-5～10
-7The vacuum degree of Pa, standing-wave ratio is little, generally about 1.2, in addition littler.
High-power microwave source and microwave system thereof generally all link to each other with the dynamic vacuum system together, i.e. no longer sealed-off of microwave tube, but in entire work process, constantly bleed by vacuum pump together with system.Because High Power Microwave System is quite huge, therefore the vacuum degree that can reach often has only 10
-3～10
-4The Pa order of magnitude, in this case, its microwave window no longer needs as the traditional microwave pipe as a body part and hardware welding, and can adopt the sealing of vacuum rubber circle, do not re-use the materials such as pottery of the pressure can not bear the compress rubber circle time as the low loss dielectric sheet of window yet, and adopt not breakable materials such as polyethylene, polytetrafluoroethylene.
If require microwave window directly is placed in the high-power microwave guide system, owing to dielectric disk in window and elastic tape must be compressed, with the acquisition airtight effect, and elastic tape always is positioned in the groove of processing specially on the waveguide flange, so the dielectric disk in window size must be bigger than cross section in the waveguide.Numerical simulation result shows, at this moment will cause serious not matching, and causes microwave can not pass through this microwave window smoothly.Such as, when using the BJ-32 waveguide, sectional dimension is 72.14mm * 34.04mm in it, window adopts the thick polyfluortetraethylene plate of 3mm, in order to compress diameter is 5 millimeters elastic tape, and the every limit of window enlarges about 14mm than cross section in the waveguide, and it is of a size of 100mm * 61.5mm, in 2.5～3.2GHz frequency range, the standing-wave ratio overwhelming majority that analog computation obtains is more than 2.
In order to reduce the standing wave of microwave window, should reduce the window size, analog computation shows, for top example, even when the dielectric disk in window size is reduced to identical with sectional dimension in the waveguide, although at this moment dielectric disk in window fully no longer can be pushed down elastic tape, just no longer have sealing function, the standing-wave ratio in 2.5～3.2GHz frequency range is still between 1.35～1.4.Have only when the dielectric disk in window size to reach 60mm * 31.5mm, promptly also want hour than sectional dimension in the waveguide, standing-wave ratio just may drop to below 1.2, and obviously such size can not adopt fully.
Because elastic tape itself also is a kind of dielectric material, the in fact equivalent size that has increased dielectric disk in window of the existence of elastic tape, cause the standing-wave ratio of microwave window to increase, overcome the influence of lute, can adopt two approach, one of approach is the equivalence influence that the size of minimizing dielectric disk in window itself is offset elastic tape, but indicated as top calculated examples, this will cause dielectric disk in window undersized, can't enclose sealing function by compress rubber at all; Another approach is the influence of shield gasket circle, and needn't reduce the size of dielectric disk in window, and the present invention just is being based on that this thinking proposes.
Summary of the invention:
The present invention proposes a kind of easy microwave output window, it adopts the dieelctric sheet that is covered with thin metal layer in the lute position as window, has shielded the influence of elastic tape effectively, thereby has significantly reduced the standing-wave ratio of microwave window.
The present invention is achieved in that
As shown in Figure 1, the present invention includes: the common flange 1 of waveguide, waveguide 2, have the window flange 3 of the groove of placing lute 4, vacuum seal elastic tape 4, flange trip bolt 5, compress the dull and stereotyped window flange 6 of dielectric disk in window and elastic tape, the thin metal layer 8 that is applied on dielectric disk in window 7 and the window.
1,3,6 and two sections waveguides 2 of flange are welded two sections straight wave guides of formation respectively; On the dieelctric sheet of metallisation thin layer with waveguide in thin metal layer on the sectional dimension opposite position erode in advance, only keep the thin metal layer 8 that stretches into flange 3 and the corresponding scope of 6 pressing sections; Then with vacuum seal elastic tape 4, corrode good dielectric disk in window 7 and be successively placed on the flange 3, the straight wave guide pipe that will have a flange 6 presses and compresses with trip bolt 5 and promptly constitutes simple microwave window of the present invention.
Because when compressing window flange 3 and 6 by trip bolt 5, the dielectric disk in window 7 that is covered with thin metal layer will closely electrically contact with window flange 3 towards the thin metal layer 8 on elastic tape 4 one sides, thereby shielded the influence of 4 pairs of electromagnetic fields of elastic tape, at this moment elastic tape 4 still plays vacuum-packed effect, but its influence no longer exists concerning electromagnetic field, the promptly no longer equivalent size that increases dielectric disk in window.
Dielectric disk in window can be a single face metallisation thin layer, also can be two-sided metallisation thin layer.As seen from Figure 1, actually play the having only on the window 7 towards the thin metal layer 8 of elastic tape 4 one sides of shielding elastic tape 4 effect, the window thin metal layer of elastic tape one side dorsad cuts little ice, thereby not essential.It is firm that thin metal layer must combine with dieelctric sheet, and combination interface itself can not leak gas.
The material of dielectric disk in window should be selected low-loss, dielectric material that intensity is good, and the thickness of dielectric disk in window is that principal element is considered can bear atmospheric pressure, in order to reduce lossy microwave and leakage, is satisfying under the requirement of strength prerequisite, should approach a bit as far as possible.Thin metal layer on the window generally only several thick to tens.
In order further to reduce microwave by the possibility of window to external leakage, window flange 3 can stretch out a metal edges to cover the window flange 6 of opposite side, form the metal enclosed circle of a circle with shielding because the slit between two window flanges 3 that window causes and 6, any other can screen method your beautiful writings slit method can play the effect that prevents microwave leakage too.
This simple microwave window cost is low, simple, loss is little, standing-wave ratio is little.
Description of drawings
Fig. 1 is the cutaway view of simple microwave window
Wherein: 1. the common flange of waveguide, 2. waveguide 3. has the window flange of the groove of placing lute, 4. vacuum rubber circle, 5. trip bolt, 6. dull and stereotyped window flange, 7. dielectric disk in window, the 8. thin metal layer that keeps on the window
Embodiment
As shown in Figure 1: an end of two sections waveguides 2 respectively is welded with a flange 1 that is connected usefulness with microwave system, the other end then is welded with window flange 3 and 6 respectively, on window flange 3, have the groove of placing elastic tape 4, the window 7 of polytetrafluoroethylene is that single face applies copper, on the window with waveguide in the corresponding part of sectional dimension, copper-clad is eroded in advance, only keep the copper-clad 8 that window stretches into the window flange section.When window flange 3 and 6 being compressed with trip bolt 5, will force elastic tape 4 distortion, make its with window 7 between reach airtight and contact, copper-clad 8 on the window 7 and window flange 3 reach and electrically contact simultaneously, thereby have shielded the influence of elastic tape to electromagnetic field.
(interior sectional dimension is such microwave window of 72.14mm * 34.04mm) make by the BJ-32 waveguide, employing thickness is that the polytetrafluoroethylene single face copper clad plate that the microstrip circuit of 3mm is used is made window, be of a size of 100mm * 61.5mm, lute is the O type vacuum rubber circle of Φ 5.Actual test result shows that all less than 1.23, the overwhelming majority is less than 1.2 in 2.5～3.2GHz frequency band for its standing-wave ratio.And if replace applying the copper window with the polytetrafluoroethylene window that does not apply the same size of copper, then actual test result at 2.6～3.2GHz frequency band range standing internal wave coefficient all greater than 2, in 2.5～2.6GHz frequency band also between 1.6～2.2.
Claims (5)
1. a simple microwave window is characterized in that it is made of the microwave low-loss dielectric disk in window (7) that is pressed in the metallisation thin layer (8) between two window flanges (3) and (6), and utilizes vacuum rubber circle (4) to carry out vacuum seal.
2. simple microwave window according to claim 1, it is characterized in that the thin metal layer that dielectric disk in window (7) is gone up with the corresponding part in the interior cross section of waveguide (2) is applied erodes in advance, only keep the thin metal layer (8) on the window part of going deep between window flange (3) and (6).
3. simple microwave window according to claim 1 is characterized in that dielectric disk in window (7) is that single face applies electric conductivity good metal thin layer by the part that window flange (3) and (6) compress.
4. simple microwave window according to claim 1 is characterized in that dielectric disk in window (7) is the two-sided electric conductivity good metal thin layer that applies by the part that window flange (3) and (6) compress.
5. simple microwave window according to claim 1 is characterized in that the used metal of described thin metal layer (8) is a copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510020245 CN1812185A (en) | 2005-01-25 | 2005-01-25 | Simple microwave window |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510020245 CN1812185A (en) | 2005-01-25 | 2005-01-25 | Simple microwave window |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1812185A true CN1812185A (en) | 2006-08-02 |
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ID=36844934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510020245 Pending CN1812185A (en) | 2005-01-25 | 2005-01-25 | Simple microwave window |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1812185A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104465274A (en) * | 2014-12-04 | 2015-03-25 | 电子科技大学 | Novel broadband high-average-power air cooling structure output window |
| CN107238278A (en) * | 2017-07-11 | 2017-10-10 | 中国科学院电子学研究所 | A kind of detachable cell type window for micro-wave vacuum |
| CN113193312A (en) * | 2021-04-25 | 2021-07-30 | 电子科技大学 | Circular waveguide TE0nMode ultra-wideband output window structure |
-
2005
- 2005-01-25 CN CN 200510020245 patent/CN1812185A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104465274A (en) * | 2014-12-04 | 2015-03-25 | 电子科技大学 | Novel broadband high-average-power air cooling structure output window |
| CN107238278A (en) * | 2017-07-11 | 2017-10-10 | 中国科学院电子学研究所 | A kind of detachable cell type window for micro-wave vacuum |
| CN107238278B (en) * | 2017-07-11 | 2020-01-31 | 中国科学院电子学研究所 | Detachable box type window for microwave vacuum drying |
| CN113193312A (en) * | 2021-04-25 | 2021-07-30 | 电子科技大学 | Circular waveguide TE0nMode ultra-wideband output window structure |
| CN113193312B (en) * | 2021-04-25 | 2022-05-03 | 电子科技大学 | Circular waveguide TE0nMode ultra-wideband output window structure |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |