CN114024114A - Waveguide port air pressure protection structure of waveguide circulator and waveguide circulator composed of structure - Google Patents
Waveguide port air pressure protection structure of waveguide circulator and waveguide circulator composed of structure Download PDFInfo
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- CN114024114A CN114024114A CN202111337614.5A CN202111337614A CN114024114A CN 114024114 A CN114024114 A CN 114024114A CN 202111337614 A CN202111337614 A CN 202111337614A CN 114024114 A CN114024114 A CN 114024114A
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- circulator
- medium sealing
- air pressure
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- 238000007789 sealing Methods 0.000 claims abstract description 44
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 229920002492 poly(sulfone) Polymers 0.000 claims description 2
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 32
- 238000005516 engineering process Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/32—Non-reciprocal transmission devices
- H01P1/38—Circulators
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- Waveguide Connection Structure (AREA)
Abstract
The invention discloses a waveguide port air pressure protection structure of a waveguide circulator and a waveguide circulator consisting of the structure, belonging to the technical field of microwave devices and comprising a waveguide port, wherein a medium sealing groove is arranged at the waveguide port, and a medium sealing plate is arranged in the medium sealing groove; by adopting the air pressure protection structure, the problem that the power capacity is sharply reduced due to the fact that the air pressure is reduced along with the change of the environment in a low-air-pressure environment of the waveguide circulator can be solved, the power bearing capacity of the circulator part can be greatly improved, meanwhile, the excess materials can be prevented from entering the waveguide circulator, the risk of discharging caused by the excess materials is greatly reduced, the reliability of the waveguide circulator is greatly improved, and the circulator is convenient to miniaturize; meanwhile, the structure can be popularized to the application scenes of waveguide products, such as waveguide loads, waveguide isolators, waveguide coaxial conversion, waveguide couplers, waveguide power dividers and other series of waveguide products.
Description
Technical Field
The invention relates to the technical field of microwave devices, in particular to a waveguide circulator waveguide port air pressure protection structure and a waveguide circulator composed of the same.
Background
In a missile-borne or airborne environment, microwave products often operate in a low-pressure environment for a long time or a short time due to the special use environment. From the paschen curve (shown in fig. 1), it is known that the lower the ambient pressure during the pressure drop, the more likely the discharge will result.
In the microwave system, the power density is proportional to the voltage, that is, the ordinate in fig. 1 can be converted into the power capacity, and the curve variation trend is more obvious according to the relationship between the voltage and the power, and the obtained curve is as shown in fig. 2. Meanwhile, as can be seen from the comparison of the power P1 corresponding to the pressure of Pd1 in the figure, the power bearing capacity of the product is improved obviously by properly maintaining the internal pressure of the product.
The primary environment in which microwave devices in missile and airborne systems operate is the low gas pressure environment, and from paschen curves, it is known that power capacity values are greatly increased as gas pressures around critical values evolve to higher and lower pressures. Based on the principle, the air pressure protection design is carried out at the waveguide port, a part of air is sealed in the cavity, and in a low-pressure environment, under the condition that the difference between the internal pressure and the external pressure is certain, the internal pressure is basically kept unchanged, so that the purpose of improving the power bearing capacity in the low-pressure environment is achieved.
The existing sealing design technology performed at a waveguide port is mainly a waveguide window design technology, and the specific technology is introduced as follows: the waveguide window is a common waveguide port sealing design at present, but the waveguide window needs a larger volume for achieving sealing, the waveguide window is designed as shown in fig. 3 and 4, and comprises a large flange a with a sealing groove, a small connecting flange b and a dielectric slab c, wherein the large flange a with the sealing groove and the small connecting flange b are both provided with matching sections d.
The design technology of the waveguide window is mainly applied to a vacuum environment, a missile-borne or airborne use environment, and the whole system works in the air, so that the important limitation on the volume is large, and the limitation on the volume of microwave passive devices such as a circulator is large, so that the design technology of the waveguide window has the following defects:
(1) the electrical design and the structural design are complex;
(2) the structure size is large, which is not beneficial to miniaturization design;
(3) the sealing material is mainly applied to vacuum and high-pressure environments, and has high requirements on dielectric materials and sealing processes.
Therefore, it can be seen from the above-mentioned shortcomings that the waveguide window structure is large in volume at present, difficult to use in a system with large volume limitation of missile-borne and airborne environments, and the start-up working time of the missile-borne and airborne environments is short, and a long-time air pressure protection design is rarely needed.
Therefore, the existing waveguide window design technology is not suitable for airborne and missile-borne use, and a simple and effective design mode is urgently needed to maintain the air pressure inside the product in a short time, so that the purpose of improving the power bearing capacity of the product in a low-air-pressure environment is achieved.
Disclosure of Invention
An objective of the present invention is to provide a waveguide port air pressure protection structure of a waveguide circulator, so as to solve the above problem.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a waveguide circulator waveguide mouth atmospheric pressure protective structure, includes the waveguide port department is provided with the medium seal groove, be provided with the medium closing plate in the medium seal groove.
According to the invention, the medium sealing plate is arranged at the waveguide port (also called as a waveguide port), so that the single waveguide circulator forms an internal closed space, signals can be transmitted through the waveguide, but the effect of maintaining the internal air pressure is achieved by physically forming a barrier. The circulator with the protective structure can maintain the internal air pressure of the product to a certain extent in a low-air-pressure environment, and the power bearing capacity of the product in the low-air-pressure environment is improved.
As a preferred technical scheme: and blocking parts used for limiting the medium sealing plate are further arranged at two ends of the medium sealing groove. A barrier is provided as a means of securing the dielectric seal plate in the dielectric seal groove.
As a preferred technical scheme: the medium sealing groove and the medium sealing plate are bonded through smearing glue. This is also a way to secure the dielectric seal plate in the dielectric seal groove. The joint of the cavity and the medium is coated with glue, the air pressure difference which can be borne by adopting different processes can be different according to different materials, the lifting power is different, and the air pressure protection design can be formed at the position of the waveguide port. For the use in a low-pressure environment, the joint surface of the sub-cavities is coated with glue solution, such as silicon rubber and the like, so that the joint surface can also have a certain blocking effect, and the internal and external air pressure difference is improved to a certain degree.
As a preferred technical scheme: the thickness of the medium sealing plate is not more than 0.2 mm.
As a preferred technical scheme: the relative dielectric constant of the dielectric sealing plate is less than or equal to 10, the relative dielectric constant of the dielectric sealing plate is required to be as small as possible, and more preferably less than or equal to 3. Because the matching medium around is air, and the default dielectric constant of air and vacuum is 1, which is the minimum, in the simulation design, the smaller the dielectric constant of the dielectric material is, the smaller the transition change of impedance matching is, and the smaller the performance interference is, and in the commonly used dielectric material, the dielectric constant of ceramic is relatively high, generally 9 points are more, so the setting is not more than 10, and is as small as possible.
As a preferred technical scheme: the medium sealing plate is made of non-metallic materials.
As a preferred technical scheme: the non-metallic material is at least one of polytetrafluoroethylene, polyimide, polysulfone, ceramic and glass.
According to the design requirement of the waveguide port medium air pressure protection, a three-dimensional electromagnetic simulation model is established, and the obtained result is shown in fig. 5, wherein cubes on two sides represent a waveguide transmission section and the medium is in the middle in fig. 5. In order to increase the dielectric protection design at the waveguide port conveniently, the thickness of the protection medium is required to be as small as possible, the structure is simple, and a matching section commonly used in the waveguide window design is abandoned, so that the model is simplified, and the size is reduced.
According to the simulation result, the smaller the thickness of the medium is, the easier the matching design is. After the design is finished, the waveguide port protection matching design section and the circulator can be subjected to combined simulation together, a better matching design result is obtained, and the waveguide port protection matching design is simple and is easier to perform combined simulation together with the circulator. According to the design result, the smaller the dielectric thickness is, the easier the design is, the structural strength and processing are considered comprehensively, the dielectric matching design is the easiest when the dielectric thickness is 0.2mm, and the relative dielectric constant is as small as possible.
The protective structure has lower requirement on air tightness, so the design can be simplified in the aspect of air pressure protection design, the volume ratio of the waveguide window structure is greatly reduced, and the adjustment and the modification can be carried out on the basis of the original circulator structure. However, different dielectric materials have different designs.
The 'size reduction' of the invention is based on the fact that the flange of the conventional waveguide window is matched with the flange of the vacuum tank and is also fixed in terms of the waveguide port. Therefore, the waveguide port is large, the volume is reduced only a little, for example, only half, the volume reduction of the waveguide port is more obvious, for example, 1/5 is even smaller, and therefore, the volume reduction of the invention is approximately 1/5-1/2.
Another object of the present invention is to provide a waveguide circulator having the above waveguide port air pressure protection structure, specifically: the device comprises an upper cavity and a lower cavity, wherein the wave band ports of the upper cavity and the lower cavity are provided with medium sealing plates.
Compared with the prior art, the invention has the advantages that: the air pressure protection structure can solve the problem that the power capacity is sharply reduced due to the fact that the air pressure is reduced along with the change of the environment in a low air pressure environment of the waveguide circulator, can greatly improve the power bearing capacity of the circulator, can generally improve by 2-4 times compared with the lowest point under the condition that the air pressure is maintained in a higher range, and can also prevent excess materials from entering the waveguide circulator, so that the risk of discharging caused by the excess materials is greatly reduced. Meanwhile, the structure can be popularized to the application scenes of waveguide products, such as waveguide loads, waveguide isolators, waveguide coaxial conversion, waveguide couplers, waveguide power dividers and other series of waveguide products. The design method of the air pressure protection structure is simple, the product is convenient to miniaturize, the size of the product is only half of the size of the traditional waveguide window, the size can be reduced to 1/5 which is the original size, meanwhile, the design can prevent redundant substances from entering the cavity of the circulator, and the reliability of the waveguide circulator is greatly improved.
Drawings
FIG. 1 is a Paschen curve;
FIG. 2 is a graph of power versus air pressure change;
FIG. 3 is an exploded view of a prior art waveguide window air pressure shield structure;
FIG. 4 is an assembly view of a waveguide window air pressure guard structure of the prior art;
FIG. 5 is a three-dimensional electromagnetic simulation model;
FIG. 6 is a schematic view of the pneumatic guard structure of the present invention;
FIG. 7 is a schematic view of a pneumatic protection structure in accordance with embodiment 1 of the present invention;
fig. 8 is an exploded view of a waveguide circulator according to embodiment 1 of the present invention.
In the figure: 1. a lower cavity; 2. an upper cavity; 3. a dielectric seal plate; 4. a blocking portion; 5. a medium seal groove; 6. a waveguide parting plane; 7. a central knot; 8. a waveguide transmission section; 9. gyromagnetic ferrite; 10. a permanent magnet; a. a large flange with a sealing groove; b. connecting a small flange; c. a dielectric plate; d. and matching the segments.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1:
referring to fig. 6, the waveguide port air pressure protection structure of the waveguide circulator includes a waveguide port, a medium sealing groove 5 is arranged at the waveguide port, and a medium sealing plate 3 is fixedly arranged in the medium sealing groove 5;
in this embodiment, the following cavity 1 is taken as an example, in fig. 6, the lower cavity 1 is provided with a waveguide parting surface 6, the middle is a central junction 7, the central junction 7 is provided with three waveguide transmission sections 8 outwards, and the medium sealing groove 5 is arranged at a waveguide port at the tail end of the waveguide transmission section 8;
in this embodiment, two ends of the medium sealing groove 5 are provided with the blocking parts 4 for fixing and limiting the medium sealing groove 5 and the medium sealing plate 3, see fig. 7; the dielectric sealing plate 3 of this embodiment is made of polyimide, has a relative dielectric constant of 4, and a thickness of 0.10mm, and the whole waveguide circulator has dimensions of 58mm × 60mm × 41.4 mm.
The structure exploded view of the waveguide circulator composed of the limiting structure is shown in fig. 8, and the waveguide circulator comprises a lower cavity 1 and an upper cavity 2, wherein a gyromagnetic ferrite 9, a permanent magnet 10 and the like are arranged in the cavity, and a dielectric sealing plate 3 is fixedly arranged at a waveguide port of the cavity.
Power bearing capacity comparative test:
a certain BJ100 waveguide circulator is required to meet the requirement that 25000 meters of high-altitude work can bear 600W of power, the corresponding atmospheric pressure is 2.5KPa, a design method of a conventional waveguide circulator is adopted in the initial design stage, the whole atmospheric pressure is controlled by a system, the internal atmospheric pressure is completely reduced to 2.5KPa, and only a 300W low-pressure test is passed due to the fact that the internal atmospheric pressure is too low; by adopting the structure of the embodiment, the internal air pressure of the cavity is improved, the low-air-pressure test of 830W is finally passed, and compared with the internal field intensity analysis, the internal atmospheric pressure is kept to exceed 7KPa, which is improved by 2.8 times, namely, the circulator of the embodiment can greatly improve the power bearing capacity of the circulator part.
Example 2:
in this embodiment, the dielectric sealing plate 3 is fixedly disposed in the dielectric sealing groove 5 by way of glue coating, the dielectric sealing plate 3 of this embodiment is made of polyimide, has a relative dielectric constant of 4 and a thickness of 0.16mm, the size of the whole waveguide circulator is 58mm × 60mm × 41.4mm, and the rest is the same as that of embodiment 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a waveguide circulator waveguide mouth atmospheric pressure protective structure which characterized in that: the waveguide sealing structure comprises a waveguide port, wherein a medium sealing groove is formed in the waveguide port, and a medium sealing plate is arranged in the medium sealing groove.
2. The waveguide port gas pressure guard structure of claim 1, wherein: and blocking parts used for limiting the medium sealing plate are further arranged at two ends of the medium sealing groove.
3. The waveguide port gas pressure guard structure of claim 1, wherein: the medium sealing groove and the medium sealing plate are bonded through smearing glue.
4. The waveguide port gas pressure guard structure of claim 1, wherein: the thickness of the medium sealing plate is not more than 0.2 mm.
5. The waveguide port gas pressure guard structure of claim 1, wherein: the relative dielectric constant of the dielectric sealing plate is less than or equal to 10.
6. The waveguide port gas pressure guard structure of claim 1, wherein: the medium sealing plate is made of non-metallic materials.
7. The waveguide port gas pressure guard structure of claim 6, wherein: the non-metallic material is at least one of polytetrafluoroethylene, polyimide, polysulfone, ceramic and glass.
8. A waveguide circulator, comprising: the device comprises an upper cavity and a lower cavity, wherein the wave band ports of the upper cavity and the lower cavity are provided with medium sealing plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111337614.5A CN114024114A (en) | 2021-11-12 | 2021-11-12 | Waveguide port air pressure protection structure of waveguide circulator and waveguide circulator composed of structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111337614.5A CN114024114A (en) | 2021-11-12 | 2021-11-12 | Waveguide port air pressure protection structure of waveguide circulator and waveguide circulator composed of structure |
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| CN114024114A true CN114024114A (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111337614.5A Pending CN114024114A (en) | 2021-11-12 | 2021-11-12 | Waveguide port air pressure protection structure of waveguide circulator and waveguide circulator composed of structure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072447A (en) * | 2002-08-07 | 2004-03-04 | New Japan Radio Co Ltd | Waveguide airtight window structure |
| US20050179504A1 (en) * | 2002-11-07 | 2005-08-18 | Ems Technologies, Inc. | Transformer-free waveguide circulator |
| JP2011135479A (en) * | 2009-12-25 | 2011-07-07 | Nippon Telegr & Teleph Corp <Ntt> | Waveguide sealing member |
| 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 |
-
2021
- 2021-11-12 CN CN202111337614.5A patent/CN114024114A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072447A (en) * | 2002-08-07 | 2004-03-04 | New Japan Radio Co Ltd | Waveguide airtight window structure |
| US20050179504A1 (en) * | 2002-11-07 | 2005-08-18 | Ems Technologies, Inc. | Transformer-free waveguide circulator |
| JP2011135479A (en) * | 2009-12-25 | 2011-07-07 | Nippon Telegr & Teleph Corp <Ntt> | Waveguide sealing member |
| 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 |
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Application publication date: 20220208 |
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