CN114678675A - Device for obtaining established coupling coefficient under low-temperature vacuum condition - Google Patents
Device for obtaining established coupling coefficient under low-temperature vacuum condition Download PDFInfo
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- CN114678675A CN114678675A CN202210215309.7A CN202210215309A CN114678675A CN 114678675 A CN114678675 A CN 114678675A CN 202210215309 A CN202210215309 A CN 202210215309A CN 114678675 A CN114678675 A CN 114678675A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
Abstract
The invention discloses a device for acquiring a set coupling coefficient under a low-temperature vacuum condition, which belongs to the technical field of microwaves and comprises a low-temperature vacuum cavity, a resonant cavity and at least one coupling structure group, wherein the coupling structure group comprises a first wire, a vacuum sealing joint, a second wire, an actuator and a tuning coupling structure which are sequentially connected; the resonant cavity is positioned in the low-temperature vacuum cavity; the vacuum sealing joint is fixed on the low-temperature vacuum cavity, the first wire is arranged outside the low-temperature vacuum cavity, and one end of the tuning coupling structure is coupled with the resonant cavity. According to the invention, by utilizing the inverse piezoelectric effect of the actuator, the position of the tuning coupling structure in the resonant cavity can be adjusted in a linkage manner only by externally adjusting the working voltage of the actuator under the condition of not influencing the low-temperature vacuum condition, so that a given coupling coefficient is obtained, and meanwhile, the nano-scale stepping of the actuator can greatly improve the tuning precision of the device.
Description
Technical Field
The invention belongs to the technical field of microwaves, and particularly relates to a device for acquiring a set coupling coefficient under a low-temperature vacuum condition.
Background
Resonators have a large number of applications in practical circuits, in particular high quality factor resonators, giving excellent properties to structures such as filters and resonant testing. In some resonant cavity application circuits, the resonant cavity is required to have a high quality factor and a predetermined coupling state with external circuits (Gupta Amitava Sen, Howe David A, Nelson Craig, Hati Archita, Walls Fred L, Nava Jose F. high spectral purity microwave oscillator: design using capacitive air-dielectric cavity) [ J]IEEE transactions on ultrasound, ferroelectrics, and frequency control,2004,51 (10)). The quality factor is defined as the ratio of the total stored energy of the electromagnetic field in the resonant cavity to the energy lost in the cavity during a period, and a high quality factor can be obtained by increasing the stored energy or reducing the loss. The limitation of materials and structures makes it difficult to improve the stored energy, so that the electrical parameters of the materials forming the resonant cavity are changed by reducing the test temperature, and further the cavity loss is reduced. For example, a sapphire dielectric resonator, changes the test environment, and the electrical parameters such as the conductivity, the dielectric constant, the loss tangent and the like are changed along with the change, and the change of the conductivity and the dielectric constant relative to the loss tangent is negligible. The loss tangent of sapphire at normal temperature is 5X 10 -6The sapphire loss tangent at the liquid nitrogen temperature (77K) became 5X 10-8Further lowering the temperature, e.g. the sapphire loss tangent at liquid helium temperature (4.2K) to even 2X 10-10. In addition, the temperature change can affect the electric parameters and the structure of the resonant cavity, so that the intensity of the electromagnetic field at the position of the coupling structure is changed, and the coupling coefficient is changed. Therefore, in order to meet the requirements of resonant cavity application circuits, the coupling structure needs to be tuned to obtain a given coupling coefficient while the test temperature is reduced to obtain a high quality factor.
At present, a coupling structure is usually tuned by manually stretching a transmission line at normal temperature, but the precision is low. Secondly, the input-output coupling structure (CN 106252801B) can be tuned by adjusting the screw, so that the precision is improved to a certain extent compared with manual stretching, and the operation is more convenient. For bore coupling, tuning can also be done with a sliding piston. However, in a 77K low-temperature vacuum environment, the mechanical transmission coupling structure is not easy to be adopted for tuning. Considering that the coupling structure is fixed in a vacuum bellows connected to the vacuum chamber, tuning of the coupling structure in a 77K low temperature vacuum environment is achieved by moving the vacuum bellows in a normal temperature environment. However, the tuning precision of this method is low, and the length of the vacuum bellows affects the tuning or test results: the vacuum corrugated pipe is easy to deform when the length is too long, the heat conduction is too fast when the length is too short, and the temperature of the resonant cavity is difficult to keep low temperature. In addition, the cryogenic vacuum pump with lower temperature is a two-stage refrigeration, and it is difficult to obtain a given coupling coefficient by using the mechanical transmission coupling structure.
Disclosure of Invention
The present invention is directed to solve the above problems in the prior art, and an object of the present invention is to provide a device for obtaining a predetermined coupling coefficient under a low-temperature vacuum condition, so as to achieve nano-scale precision adjustment of a coupling structure without affecting the low-temperature vacuum condition.
The technical scheme adopted by the invention is as follows:
the device for obtaining the established coupling coefficient under the low-temperature vacuum condition is characterized by comprising a low-temperature vacuum cavity 1, a resonant cavity 2 and at least one coupling structure group, wherein the coupling structure group comprises a first electric wire 7, a vacuum sealing joint 6, a second electric wire 5, an actuator 4 and a tuning coupling structure 3 which are sequentially connected; wherein, the resonant cavity 2 is positioned inside the low-temperature vacuum cavity 1; a vacuum sealing joint 6 of the coupling structure group is fixed on the low-temperature vacuum cavity 1, and a first wire 7 is arranged outside the low-temperature vacuum cavity 1 and connected with a voltage source in a normal-temperature environment; one end of a tuning coupling structure 3 of the coupling structure group is coupled and assembled with the resonant cavity 2;
when the testing temperature of the resonant circuit where the device is located changes, the actuator 4 is deformed by adjusting the working voltage transmitted to the actuator 4 through the first wire 7, the vacuum sealing joint 6 and the second wire 5, and then the position of the tuning coupling structure 3 in the resonant cavity 2 is adjusted in a linkage manner, so that the set coupling coefficient is obtained.
Further, the manner of coupling and assembling the tuning coupling structure 3 and the resonant cavity 2 includes probe coupling, ring coupling or waveguide coupling.
Further, the step precision of the actuator 4 is in the nanometer level, and the total stroke reaches the dozens of millimeters level.
Further, when the coupling assembly is performed by using a probe coupling or a ring coupling, the tuning coupling structure 3 includes a flat rack 8, a spur gear 9, a bar shaft 10, a transmission line 11, a first fixed box 12, a second fixed box 13, and a screw hole 14; the middle of the strip-shaped shaft 10 is a through hole tightly matched with the transmission line 11, the periphery of the strip-shaped shaft is divided into two sections, one section is a polygon, and the other section is an external thread; the other end of the transmission line 11 is made into a probe or a coupling ring and extends into the resonant cavity 2; the middle of the spur gear 9 is provided with an internal thread matched with the external thread, and the periphery of the spur gear is matched with the flat rack 8; the first fixed box 12 and the second fixed box 13 are fixed together and used for clamping the spur gear 9, and the second fixed box 13 is fixed on the inner wall of the low-temperature vacuum cavity 1; the position of the bar shaft 10 is fixed by providing a screw hole 14 on the first fixing case 12; one end of the flat rack 8 is connected with the actuator 4; the operating voltage of the actuator 4 is adjusted to push the flat rack 8 to rotate the spur gear 9, so that the bar shaft 10 and the transmission line 11 are moved, the position of the transmission line 11 in the resonant cavity 2 is changed, and a given coupling coefficient is obtained.
Further, the flat rack bar 8 and the spur gear 9 are made of a heat insulating material.
Further, when waveguide coupling is adopted for coupling assembly, the tuning coupling structure 3 comprises a sliding piston 15 and a rectangular waveguide 16, one end of the sliding piston 15 is in sliding fit with the rectangular waveguide 16, the end face of the sliding piston 15 in the rectangular waveguide 16 is used as a short-circuit face, the rectangular waveguide 16 is coupled with the resonant cavity 2, and the other end of the sliding piston 15 is connected with the actuator 4; by adjusting the operating voltage of the actuator 4 to push the sliding piston 15, the position of the short-circuited surface in the rectangular waveguide 16 is changed, and a given coupling coefficient is obtained.
Further, a coaxial-waveguide converter 17 is provided on the waveguide wall of the rectangular waveguide 16 for connecting an external circuit.
Further, the number of the coupling structure groups is determined according to the required working mode of the resonant cavity 2 and the coupling assembly mode.
The invention has the beneficial effects that:
the invention provides a device for obtaining a set coupling coefficient under a low-temperature vacuum condition, which can adjust the position of a tuning coupling structure in a resonant cavity in a linkage manner by using the inverse piezoelectric effect of an actuator and only adjusting the working voltage of the actuator externally under the condition of not changing the structure of a low-temperature vacuum cavity (namely not influencing the low-temperature vacuum condition), thereby obtaining the set coupling coefficient, and simultaneously, the nano-scale stepping of the actuator can greatly improve the tuning precision of the device.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for obtaining a predetermined coupling coefficient under a low-temperature vacuum condition according to embodiments 1 and 2 of the present invention;
FIG. 2 is an assembly structure diagram of a coupling cavity and a tuning coupling structure when a probe is used for coupling in embodiment 1 of the present invention;
FIG. 3 is an assembly structure diagram of a coupling cavity and a tuning coupling structure when ring coupling is adopted in embodiment 1 of the present invention;
fig. 4 is a schematic view of an assembly structure of an actuator and a tuning coupling structure in embodiment 1 of the present invention;
FIG. 5 is a schematic view of a bar shaft structure in example 1 of the present invention;
FIG. 6 is a schematic diagram of an assembly structure of a tuning coupling structure and a resonant cavity in embodiment 1 of the present invention;
FIG. 7 is an assembly structure diagram of a coupling cavity and a tuning coupling structure when a waveguide is used for coupling in embodiment 2 of the present invention;
FIG. 8 is a schematic view showing an assembled structure of an actuator and a tuning coupling structure in embodiment 2 of the present invention;
the reference symbols in the drawings are as follows:
1: a low-temperature vacuum chamber; 2: a resonant cavity; 3: tuning the coupling structure; 4: an actuator; 5: a second electric wire; 6: a vacuum seal joint; 7: a first electric wire; 8: a flat rack; 9: a spur gear; 10: a bar shaft; 11: a transmission line; 12: a first fixed box; 13: a second fixed box; 14: a threaded hole; 15: a sliding piston; 16: a rectangular waveguide; 17: a coaxial-waveguide converter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
The structure of the device for obtaining the determined coupling coefficient under the low-temperature vacuum condition is shown in fig. 1, and the device comprises a low-temperature vacuum chamber 1, a resonant cavity 2 and two coupling structure groups located on two sides of the resonant cavity 2, wherein the coupling structure groups comprise a first electric wire 7, a vacuum sealing joint 6, a second electric wire 5, an actuator 4 and a tuning coupling structure 3 which are connected in sequence.
Wherein, the resonant cavity 2 is positioned inside the low-temperature vacuum cavity 1; a vacuum sealing joint 6 of the coupling structure group is fixed on the low-temperature vacuum cavity 1, and a first wire 7 is arranged outside the low-temperature vacuum cavity 1 and connected with a voltage source in a normal-temperature environment; one end of a tuning coupling structure 3 of the coupling structure group is coupled with the resonant cavity 2 by adopting probe coupling or ring coupling for coupling assembly; when the working mode of the resonant cavity 2 is TM012 mode, the assembly can be performed by probe coupling, and the assembly structure of the coupling cavity 2 and the tuning coupling structure 3 is shown in fig. 2; when the operating mode of the resonant cavity 2 is TE011 mode, the assembly can be performed by ring coupling, and the assembly structure of the coupling cavity 2 and the tuning coupling structure 3 is shown in fig. 3.
As shown in fig. 4, the tuning coupling structure 3 includes a flat rack 8, a spur gear 9, a bar shaft 10, a transmission line 11, a first fixing box 12, a second fixing box 13, and a threaded hole 14; the structure of the bar-shaped shaft 10 is shown in fig. 5, the middle of the bar-shaped shaft is a through hole tightly matched with the transmission line 11, the periphery of the bar-shaped shaft is divided into two sections, one section is a polygon, and the other section is an external thread; one end of the transmission line 11 is correspondingly made into a probe or a coupling ring, and extends into the resonant cavity 2, as shown in fig. 6, and the other end is connected with an external circuit; the middle of the spur gear 9 is provided with an internal thread matched with the external thread, and the periphery of the spur gear is matched with the flat rack 8; the first fixed box 12 and the second fixed box 13 are fixed together and used for clamping the spur gear 9, and the second fixed box 13 is fixed on the inner wall of the low-temperature vacuum cavity 1; the position of the bar shaft 10 is fixed by providing a screw hole 14 on the first fixing case 12; one end of the flat rack 8 is connected to the actuator 4.
When the testing temperature of the resonant circuit where the device is located changes, the actuator 4 is deformed by adjusting the working voltage transmitted to the actuator 4 through the first wire 7, the vacuum sealing joint 6 and the second wire 5, the flat rack 8 is pushed to rotate the spur gear 9, the strip shaft 10 and the transmission line 11 are moved, the position of the transmission line 11 in the resonant cavity 2 is changed, and the given coupling coefficient is adjusted.
The stepping precision of the actuator 4 is in the nanometer level, and the total stroke reaches dozens of millimeters; the flat rack 8 and the spur gear 9 are made of heat insulating materials.
Example 2
The embodiment provides a device for obtaining a given coupling coefficient under a low-temperature vacuum condition, the structure of which is shown in fig. 1, and the device comprises a low-temperature vacuum chamber 1, a resonant cavity 2 and two coupling structure groups located at two sides of the resonant cavity 2, wherein the coupling structure groups comprise a first electric wire 7, a vacuum sealing joint 6, a second electric wire 5, an actuator 4 and a tuning coupling structure 3 which are connected in sequence.
Wherein, the resonant cavity 2 is positioned inside the low-temperature vacuum cavity 1; the vacuum sealing joint 6 of the coupling structure group is fixed on the low-temperature vacuum cavity 1, and the first wire 7 is arranged outside the low-temperature vacuum cavity 1 and is connected with a voltage source in a normal-temperature environment; one end of the tuning coupling structure 3 of the coupling structure group is coupled and assembled with the resonant cavity 2 by waveguide coupling, the operating mode of the resonant cavity 2 is TE011 mode, and the assembling structure of the coupling cavity 2 and the tuning coupling structure 3 is shown in fig. 7.
As shown in fig. 8, the tuning coupling structure 3 includes a sliding piston 15, a rectangular waveguide 16, and a coaxial-waveguide converter 17; one end of the sliding piston 15 is matched with the rectangular waveguide 16 in a sliding manner, the end face of the sliding piston 15 in the rectangular waveguide 16 is used as a short-circuit face, the rectangular waveguide 16 is coupled with the resonant cavity 2, and the other end of the sliding piston 15 is connected with the actuator 4; a coaxial-waveguide converter 17 is located on the waveguide wall of the rectangular waveguide 16 for connection to external circuitry.
When the testing temperature of the resonance circuit where the device is located changes, the actuator 4 is deformed by adjusting the working voltage transmitted to the actuator 4 through the first electric wire 7, the vacuum sealing joint 6 and the second electric wire 5, so as to push the sliding piston 15, change the position of the short-circuit surface in the rectangular waveguide 16 and further adjust the set coupling coefficient.
Wherein, the step precision of the actuator 4 is in nanometer level, and the total stroke reaches dozens of millimeters.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (7)
1. The device for obtaining the established coupling coefficient under the low-temperature vacuum condition is characterized by comprising a low-temperature vacuum cavity (1), a resonant cavity (2) and at least one coupling structure group, wherein the coupling structure group comprises a first electric wire (7), a vacuum sealing joint (6), a second electric wire (5), an actuator (4) and a tuning coupling structure (3) which are sequentially connected; wherein, the resonant cavity (2) is positioned in the low-temperature vacuum cavity (1); the vacuum sealing joint (6) is fixed on the low-temperature vacuum cavity (1), and the first wire (7) is positioned outside the low-temperature vacuum cavity (1); one end of the tuning coupling structure (3) is coupled and assembled with the resonant cavity (2);
The actuator (4) is deformed by adjusting the working voltage transmitted to the actuator (4) through the first wire (7), the vacuum sealing joint (6) and the second wire (5), and the position of the tuning coupling structure (3) in the resonant cavity (2) is adjusted in a linkage manner, so that a set coupling coefficient is obtained.
2. The apparatus for obtaining a predetermined coupling coefficient under a low temperature vacuum condition as claimed in claim 1, wherein the means for coupling and assembling the tuning coupling structure (3) and the resonant cavity (2) comprises a probe coupling, a ring coupling or a waveguide coupling.
3. The apparatus for obtaining a predetermined coupling coefficient under a low temperature vacuum condition as claimed in claim 2, wherein the tuning coupling structure (3) comprises a flat rack (8), a spur gear (9), a bar shaft (10), a transmission line (11), a first fixed box (12), a second fixed box (13) and a threaded hole (14) when a probe coupling or a ring coupling is adopted for coupling assembly; the middle of the strip-shaped shaft (10) is provided with a through hole which is tightly matched with the transmission line (11), the peripheral shape is divided into two sections, one section is polygonal, and the other section is an external thread; the other end of the transmission line (11) is made into a probe or a coupling ring and extends into the resonant cavity (2); the middle of the spur gear (9) is provided with an internal thread matched with the external thread, and the periphery of the spur gear is matched with the flat rack (8) through a gear; the first fixed box (12) is fixed with the second fixed box (13), and the second fixed box (13) is fixed on the inner wall of the low-temperature vacuum cavity (1); the position of the bar-shaped shaft (10) is fixed by arranging a threaded hole (14) on the first fixing box (12); one end of the flat rack (8) is connected with the actuator (4).
4. Device for obtaining a determined coupling coefficient under low-temperature vacuum conditions according to claim 3, characterized in that said rack (8) and spur gear (9) are made of a thermally insulating material.
5. The device for obtaining the determined coupling coefficient under the low-temperature vacuum condition as claimed in claim 2, wherein when the waveguide coupling is adopted for coupling assembly, the tuning coupling structure (3) comprises a sliding piston (15) and a rectangular waveguide (16), one end of the sliding piston (15) is in sliding fit with the rectangular waveguide (16), the end face of the sliding piston (15) inside the rectangular waveguide (16) is used as a short-circuit face, the rectangular waveguide (16) is coupled with the resonant cavity (2), and the other end of the sliding piston (15) is connected with the actuator (4).
6. The device for obtaining a predetermined coupling coefficient under a low-temperature vacuum condition according to claim 5, wherein a coaxial-waveguide converter (17) is disposed on the waveguide wall of the rectangular waveguide (16).
7. The apparatus for obtaining a predetermined coupling coefficient under a low temperature vacuum condition as claimed in claim 1, wherein the number of the coupling structure sets is determined according to the operation mode of the desired resonant cavity (2) and the coupling assembly manner.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053745A (en) * | 2022-12-21 | 2023-05-02 | 中国人民解放军63660部队 | Energy storage resonant cavity tuning structure of SLED pulse compression system |
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