CN101714682A - Microwave low-loss waveguide vacuum window - Google Patents
Microwave low-loss waveguide vacuum window Download PDFInfo
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- CN101714682A CN101714682A CN200910261536A CN200910261536A CN101714682A CN 101714682 A CN101714682 A CN 101714682A CN 200910261536 A CN200910261536 A CN 200910261536A CN 200910261536 A CN200910261536 A CN 200910261536A CN 101714682 A CN101714682 A CN 101714682A
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- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 8
- 239000006260 foam Substances 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 4
- XZWVIKHJBNXWAT-UHFFFAOYSA-N argon;azane Chemical compound N.[Ar] XZWVIKHJBNXWAT-UHFFFAOYSA-N 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 8
- 230000008054 signal transmission Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 229920001721 polyimide Polymers 0.000 abstract description 3
- 239000004642 Polyimide Substances 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000792859 Enema Species 0.000 description 1
- 241000233855 Orchidaceae Species 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000013872 defecation Effects 0.000 description 1
- 239000007920 enema Substances 0.000 description 1
- 229940095399 enema Drugs 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000829 suppository Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a microwave low-loss waveguide vacuum window, which is hermetically separated from normal temperature and normal pressure at one end of waveguide microwave signal transmission to low temperature and high vacuum at the other end. The window comprises an upper waveguide cavity seat and a lower waveguide cavity seat, wherein the upper waveguide cavity seat is provided with a standard waveguide flange used as a waveguide short joint; the lower waveguide cavity seat is hermetically connected with a vacuum Dewar outer wall; the combination of a double-layer film of polyimide and polytetrafluoroethylene is clamped between two waveguide ports of the upper waveguide cavity seat and the lower waveguide cavity seat to form the microwave vacuum window; and one side of the window is a normal temperature and normal pressure zone, and the other side of the window is a low temperature vacuum zone. The microwave low-loss waveguide vacuum window has good microwave transmission performance, namely low microwave loss and good standing wave in the signal transmission, has high-vacuum sealing performance, is used on a vacuum cover of high-sensitivity signal receiving equipment, and is suitable for sealing the waveguide port from L wave band to 8mm frequency band.
Description
Affiliated technical field
The present invention relates to a kind of waveguide mouth sealing device of microwave signal transmission, this matching requirements is the low temperature high vacuum that normal temperature and pressure excessively arrives the other end at an end of waveguide microwave signal transmission, this just need design high vacuum seal and cut off in waveguide, this partition is the microwave vacuum window, require the microwave vacuum window both to have excellent microwave transmission performance (being that lossy microwave is low in the signal transmission, standing wave good), possess the sealing property of high vacuum again.Its technical field relates to microwave technology and vacuum technique two big fields.
Background technology
Antenna reception microwave signal need be transferred to receiver from antenna feed and carry out processing such as signal amplification, mixing, and the sensitivity of receiver is decided by the input noise coefficient of receiving front-end amplifier, and noise factor is low more to be that receiving sensitivity is high more.For improving the ability that receiver receives small-signal, can strengthen antenna size (50 meters of domestic present antenna maximum calibers) on the one hand, but because the large aperture antenna manufacturing cost is very high, the difficult application.Be exactly to reduce receiver noise on the other hand.Realize the receiver ultra-low noise, the noise of step-down amplifier is primary, because ambient temperature amplifier can not overcome the thermal noise that device self electron motion produces, its noise objective is difficult to satisfy the occasion that survey of deep space, radio astronomy etc. require high sensitivity, so adopt the working temperature of step-down amplifier, obtain the noise level that device be can not get at normal temperatures.Generally the noise factor of amplifier can be reduced to more than 1/10th of normal temperature under the ambient temperature of 20K (253 ℃).For keeping low temperature environment, must encapsulate the low temperature amplifier with vacuum dewar.Because the feed delivery outlet of antenna mostly is waveguide output greatly, so the input of low temperature receiver must add the transmission that a low-loss microwave waveguide mouth is used for signal, this waveguide mouth not only will have low loss, also to possess functions such as vacuum seal, thermal insulation, because the lossy microwave of waveguide hermetyic window is directly to be superimposed upon on the noise factor of low noise amplifier, its performance is the key index that influences receiver sensitivity, so it is the necessary and crucial parts of low temperature receiver.Low temperature receiver of the prior art is that the Waveguide coaxial conversion is placed on the Dewar outside, transfers to the low temperature amplifier with coaxial line, because normal temperature Waveguide coaxial conversion Insertion Loss is bigger, makes the reduction of low temperature receiver noise be difficult to realize.
Summary of the invention
Not only low loss to be arranged in order to solve the waveguide mouth, also to possess problems such as vacuum seal, thermal insulation, the object of the present invention is to provide a kind of microwave low-loss waveguide vacuum window, its can bear vacuum and atmospheric pressure poor, higher intensity is arranged again, can satisfy low lossy microwave.
The technical solution adopted for the present invention to solve the technical problems is: microwave low-loss waveguide vacuum window, comprise following of the waveguide cavity seat of honour and waveguide cavity, described waveguide cavity seat of honour bidding quasi wave inducing defecation by enema and suppository orchid, as the waveguide short circuit, following of described waveguide cavity and vacuum dewar outer wall are tightly connected; The combination of the two waveguide mouth therebetween polyamides argon ammonia that the waveguide cavity seat of honour and waveguide cavity are following and the bilayer film of polytetrafluoroethylene constitutes the microwave vacuum window, and a side of window is the normal temperature and pressure district, and opposite side is the cryogenic vacuum district.The waveguide mouth that described waveguide cavity is following is provided with rigid foam.Adopt silica gel rigid foam to be adhered to the waveguide mouth of following of waveguide cavity.
Polyamides argon ammonia film has good compactness, main play side signal transmission to the vacuum seal effect, polytetrafluoroethylene film not only has good wave but also certain compactness and pliability are arranged, the main bearing strength that plays the sealing of two waveguide flange junctions and strengthen window, by the plane pressurization crimp of polytetrafluoroethylene thin plate is flowed in the seal groove to reach seal request during assembling, in addition, in the waveguide mouth on Dewar with the gluing thick hard foam of about 20mm that connects of low temperature, play the support and the insulation effect of window, in case window produces condensed water.
Beneficial effect of the present invention: the Waveguide coaxial conversion can be placed under the 77K temperature environment, greatly reduce the loss of Waveguide coaxial conversion, improve the overall performance of low temperature receiver.
Description of drawings
The present invention is described in more detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is a sectional structure schematic diagram of the present invention:
Fig. 2 is a plan structure schematic diagram of the present invention.
Among the figure, 1. vacuum (-tight) housing, 2. cryogenic vacuum district, 3. rigid foam, 4. waveguide cavity is following, 5. sealing ring, 6. screw, 7. spring washer, 8. plain washer, 9. the waveguide cavity seat of honour, 10. polytetrafluoroethylene pad, 11. normal temperature and pressure districts, 12. standard waveguide flanges, 13. polyimide films, 14. screws.
Embodiment
Referring to Fig. 1,2, vacuum (-tight) housing 1 is the shell that is installed on refrigerating system, following 4 of waveguide cavity passed through 8 screws 14 and is connected with vacuum chamber with sealing ring 5, rigid foam 3 usefulness 703 silica gel are adhered to the waveguide mouth of following 4 of waveguide cavity, place polytetrafluoroethylene pad 10 and polyimide film 13 on following 4 of waveguide cavity, the waveguide cavity seat of honour 9 is installed, add spring washer 7 and plain washer 8 with 8 hex screws 6, seat is fastening up and down with waveguide cavity, the microwave low-loss waveguide vacuum window installation.The microwave low-loss waveguide vacuum window of each frequency range all can design by schematic structure, and the highest window frequency can arrive millimeter wave frequency band.
Microwave low-loss waveguide vacuum window, its normal temperature and pressure partly is the waveguide short circuit of special band standard flange, the waveguide of vacuum section and Dewar are for being tightly connected the microwave vacuum window that the combination of the bilayer film of two waveguide mouth therebetween polyamides argon ammonia and polytetrafluoroethylene realizes.One side of window is the normal temperature and pressure district, and opposite side is the cryogenic vacuum district, makes that loss is extremely low when microwave signal is passed through window, and keeps the high vacuum (10 in the region of no pressure
-5Pa), this device is used for the vacuum (-tight) housing of high sensitivity signal receiving equipment, is applicable to the waveguide mouth sealing from L-band to the 8mm frequency range.
Major function and technical indicator: the major function of microwave low-loss waveguide vacuum window is under the utmost point low-loss transmission that guarantees microwave signal enough bearing capacities to be arranged, and guarantees that Dewar keeps high vacuum state.The leading indicator that reaches:
Require window material that all gases is had extremely low permeability, low venting rate and higher heat-insulating property.In very wide microwave frequency range, realize the microwave low-loss waveguide vacuum window of above-mentioned functions, to window material the research of lossy microwave, standing wave coupling, compactness and heat insulating ability, window structure form be the technical problem that must solve.
| Wave band | Standing-wave ratio Max | Insertion Loss max-dB | Vacuum degree Pa |
| ??S | ??1.10 | ??0.06 | ??5.0×10 -5 |
| ??X | ??1.15 | ??0.09 | ??1.0×10 -5 |
Claims (3)
1. microwave low-loss waveguide vacuum window, it is characterized in that this vacuum window comprises the waveguide cavity seat of honour (9) and following of waveguide cavity (4), waveguide flange (12) is established at the described waveguide cavity seat of honour (9), and as the waveguide short circuit, described waveguide cavity following (4) is tightly connected with the vacuum dewar outer wall; The combination of the two waveguide mouth therebetween polyamides argon ammonia of the waveguide cavity seat of honour (9) and waveguide cavity following (4) and the bilayer film of polytetrafluoroethylene constitutes the microwave vacuum window, and a side of window is the normal temperature and pressure district, and opposite side is the cryogenic vacuum district.
2. microwave low-loss waveguide vacuum window according to claim 1 is characterized in that the waveguide mouth of described waveguide cavity following (4) is provided with rigid foam (3).
3. microwave low-loss waveguide vacuum window according to claim 1 is characterized in that described rigid foam (3) is adhered to the waveguide mouth of waveguide cavity following (4) with silica gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910261536A CN101714682A (en) | 2009-12-21 | 2009-12-21 | Microwave low-loss waveguide vacuum window |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910261536A CN101714682A (en) | 2009-12-21 | 2009-12-21 | Microwave low-loss waveguide vacuum window |
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| Publication Number | Publication Date |
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| CN101714682A true CN101714682A (en) | 2010-05-26 |
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| CN200910261536A Pending CN101714682A (en) | 2009-12-21 | 2009-12-21 | Microwave low-loss waveguide vacuum window |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377442A (en) * | 2010-08-26 | 2012-03-14 | 中国科学院物理研究所 | Low-temperature receiver based on waveguide input and output |
| CN102540381A (en) * | 2012-02-24 | 2012-07-04 | 中国科学院上海光学精密机械研究所 | Ultrahigh vacuum window |
| CN103248375A (en) * | 2013-05-28 | 2013-08-14 | 中国科学院新疆天文台 | Short-centimeter-waveband dual-polarized refrigeration receiver dewar |
| CN103278904A (en) * | 2013-05-16 | 2013-09-04 | 中国科学院长春光学精密机械与物理研究所 | Method and device for implementing vacuum high-precision window |
| CN103730710A (en) * | 2013-12-24 | 2014-04-16 | 中国电子科技集团公司第十六研究所 | X-waveband refrigeration polarizer cooling structure device |
| CN108448209A (en) * | 2018-04-25 | 2018-08-24 | 中国科学院国家天文台 | A kind of multilayer polyimide film vacuum window construction for radio-frequency front-end refrigeration dewar |
| CN110048196A (en) * | 2019-03-28 | 2019-07-23 | 成都天成电科科技有限公司 | A kind of waveguide sealing element and waveguide flange part |
| CN110687424A (en) * | 2019-10-10 | 2020-01-14 | 华东光电集成器件研究所 | Avalanche diode high-frequency parameter low-temperature test system |
-
2009
- 2009-12-21 CN CN200910261536A patent/CN101714682A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377442A (en) * | 2010-08-26 | 2012-03-14 | 中国科学院物理研究所 | Low-temperature receiver based on waveguide input and output |
| CN102540381A (en) * | 2012-02-24 | 2012-07-04 | 中国科学院上海光学精密机械研究所 | Ultrahigh vacuum window |
| CN103278904A (en) * | 2013-05-16 | 2013-09-04 | 中国科学院长春光学精密机械与物理研究所 | Method and device for implementing vacuum high-precision window |
| CN103278904B (en) * | 2013-05-16 | 2016-01-20 | 中国科学院长春光学精密机械与物理研究所 | A kind of implementation method of vacuum high-precision window and device thereof |
| CN103248375A (en) * | 2013-05-28 | 2013-08-14 | 中国科学院新疆天文台 | Short-centimeter-waveband dual-polarized refrigeration receiver dewar |
| CN103248375B (en) * | 2013-05-28 | 2014-12-24 | 中国科学院新疆天文台 | Short-centimeter-waveband dual-polarized refrigeration receiver dewar |
| CN103730710B (en) * | 2013-12-24 | 2015-12-02 | 中国电子科技集团公司第十六研究所 | A kind of X-waveband refrigeration polarizer cooling structure device |
| CN103730710A (en) * | 2013-12-24 | 2014-04-16 | 中国电子科技集团公司第十六研究所 | X-waveband refrigeration polarizer cooling structure device |
| CN108448209A (en) * | 2018-04-25 | 2018-08-24 | 中国科学院国家天文台 | A kind of multilayer polyimide film vacuum window construction for radio-frequency front-end refrigeration dewar |
| CN108448209B (en) * | 2018-04-25 | 2023-08-22 | 中国科学院国家天文台 | Multi-layer polyimide film vacuum window structure for radio frequency front end refrigeration Dewar |
| CN110048196A (en) * | 2019-03-28 | 2019-07-23 | 成都天成电科科技有限公司 | A kind of waveguide sealing element and waveguide flange part |
| CN110687424A (en) * | 2019-10-10 | 2020-01-14 | 华东光电集成器件研究所 | Avalanche diode high-frequency parameter low-temperature test system |
| CN110687424B (en) * | 2019-10-10 | 2021-05-18 | 华东光电集成器件研究所 | Avalanche diode high-frequency parameter low-temperature test system |
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Application publication date: 20100526 |