CN111384537A - Cavity filter and radio frequency communication equipment - Google Patents
Cavity filter and radio frequency communication equipment Download PDFInfo
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- CN111384537A CN111384537A CN201910208815.1A CN201910208815A CN111384537A CN 111384537 A CN111384537 A CN 111384537A CN 201910208815 A CN201910208815 A CN 201910208815A CN 111384537 A CN111384537 A CN 111384537A
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- cavity
- tuning screw
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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Abstract
The embodiment of the application discloses a cavity filter and radio frequency communication equipment. The cavity filter includes: a cavity; the cover plate is covered on the cavity and surrounds the cavity together to form a resonant cavity, and a threaded hole is formed in the cover plate; the resonator is arranged in the resonant cavity and comprises a cylinder and a tuning screw connected with the cylinder, and one end of the cylinder, which is far away from the tuning screw, is provided with an opening; the tuning screw rod penetrates through the threaded hole and is in threaded connection with the cover plate, so that the resonator is adjustably connected with the cover plate. The application provides a cavity filter directly installs the syntonizer on the apron through the tuning screw rod, consequently need not to set up mount table and fastening screw specially in the bottom of cavity to reduce the inside metal parts of cavity, simplified the inside structure of cavity. Therefore, the cavity filter is beneficial to reducing the manufacturing cost of the cavity filter and realizing the miniaturization of the cavity filter.
Description
Technical Field
The embodiment of the application relates to the field of signal processing equipment, in particular to a cavity filter and radio frequency communication equipment applied to a 5G communication system.
Background
With the development of communication technology, the requirements for radio frequency communication equipment are higher and higher. In a new communication system, for example, a 5G mobile communication system, a radio frequency module may include a plurality of station configurations, such as a tower station, a pole station, and a small station, wherein some of the station configurations have a high requirement for size miniaturization.
The cavity filter is an important component of the rf communication device, and the size of the cavity filter affects the layout of the whole rf module. In a conventional metal cavity filter, a resonator mounting table is generally disposed at the bottom of a cavity of the cavity filter, a resonator is disposed on the resonator mounting table, and one end of the resonator is fixed by a fastening screw. And the other end of the resonator is provided with an opening, and a tuning screw is inserted into the cover plate of the cavity filter at the position corresponding to the opening to adjust the resonance frequency of the resonator. The part of the tuning screw rod extending out of the cavity filter is locked by a locking nut.
The inventor of the application finds that the structure of the existing cavity filter comprises a plurality of metal parts and is complex, which leads to complex assembly process and higher assembly cost, and in addition, the installation requirement of the resonator occupies more cavity inner space, which leads to the difficulty in realizing miniaturization of the whole structure of the cavity filter.
Disclosure of Invention
The embodiment of the application provides a cavity filter and radio frequency communication equipment to simplify the internal structure of the cavity filter, thereby being beneficial to realizing the miniaturization of the cavity filter.
In order to solve the above technical problem, a technical solution adopted in the present application is to provide a cavity filter, where the cavity filter includes: a cavity; the cover plate is covered on the cavity and surrounds the cavity together to form a resonant cavity, and a threaded hole is formed in the cover plate; the resonator is arranged in the resonant cavity and comprises a cylinder and a tuning screw connected with the cylinder, and one end of the cylinder, which is far away from the tuning screw, is provided with an opening; the tuning screw rod penetrates through the threaded hole and is in threaded connection with the cover plate, so that the resonator is adjustably connected with the cover plate.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide a radio frequency device, where the radio frequency device includes an antenna and the cavity filter, and the antenna is coupled with the cavity filter.
The application provides a cavity filter directly installs the syntonizer on the apron through the tuning screw rod, consequently need not to set up mount table and fastening screw specially in the bottom of cavity to reduce the inside metal parts of cavity, simplified the inside structure of cavity. Therefore, the cavity filter is beneficial to reducing the manufacturing cost of the cavity filter and realizing the miniaturization of the cavity filter.
Drawings
Fig. 1 is a schematic structural cross-sectional view of an embodiment of a cavity filter according to the present application.
Fig. 2 is a schematic structural diagram of an embodiment of the resonator of the present application.
Fig. 3 is a schematic structural diagram of another embodiment of the resonator of the present application.
Fig. 4 is a schematic structural diagram of another embodiment of the resonator of the present application.
Fig. 5 is a schematic structural diagram of an embodiment of the radio frequency communication device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a cavity filter according to an embodiment of the present disclosure. The cavity filter includes: a chamber 10, a cover plate 20, and a resonator 30.
The cover plate 20 covers the cavity 10 and encloses with the cavity 10 to form a resonant cavity 11. The chamber body 10 and the cover plate 20 may be made of metal materials and coupled by appropriate fasteners, such as screws, or the chamber body 10 and the cover plate 20 may be coupled by welding. The cover plate 20 is provided with a screw hole (not shown). It is understood that the cavity filter may include a plurality of cavities, and for convenience of description, only one cavity 11 and the related structure are described in the present embodiment.
The resonator 30, which may be a metal resonator, is disposed within the resonant cavity 11. The resonator comprises a barrel 31 and a tuning screw 32 connected to the barrel 31. One end of the cylinder 31 is connected to the tuning screw 32, and the other end of the cylinder 31 is opened. The tuning screw 32 and the barrel 31 may be made of the same metal material, or may be made of different metal materials. The tuning screw 32 and the barrel 31 may be integrally formed or may be attached by mounting, welding, or the like.
The tuning screw 32 is inserted into the threaded hole of the cover plate 20 and is threadedly coupled to the cover plate 20, so that the resonator 30 is adjustably coupled to the cover plate 20 (and the chamber 10). By turning the tuning screw 32, the resonator 30 can be moved up and down relative to the cover plate 20 and/or the chamber 10, thereby adjusting the resonant frequency of the resonant unit.
The application provides a cavity filter directly installs the syntonizer on the apron through the tuning screw rod, consequently need not to set up mount table and fastening screw specially in the bottom of cavity to reduce the inside metal parts of cavity, simplified the inside structure of cavity. Therefore, the cavity filter is beneficial to reducing the manufacturing cost of the cavity filter and realizing the miniaturization of the cavity filter.
When the resonator 30 is adjusted to the proper position by the tuning screw 32, the tuning screw 32 needs to be locked to avoid the resonator 30 from shaking or moving to affect the performance parameters of the device. Therefore, in some embodiments, the cavity filter further includes a locking nut 40, and the locking nut 40 is threadedly coupled to the tuning screw 32 to fix the resonator 30 to the cover plate 20. For convenience of operation, the lock nut 40 may be disposed at an outer side of the cavity filter, and after the position of the resonator 30 is adjusted to obtain a desired resonance frequency, the lock nut 40 is fitted over the tuning screw 40 and tightened, thereby locking the tuning screw 32 so that it cannot rotate. The size of the lock nut 40 is not limited herein as long as its internal threads match the external threads of the tuning screw 32 and provide sufficient strength.
In other embodiments, instead of using the lock nut 40, the tuning screw 32 may be configured as a self-locking tuning screw. For example, two notches may be provided in the threaded section of the tuning screw 32 at different axial positions, such that when the threads of the tuning screw 32 are matched with the threaded hole of the cover plate 20, the threaded section of the tuning screw 32 is slightly compressed and deformed axially under the action of external force, and the deformed restoring force of the tuning screw 32 after the axial deformation causes the threaded section of the tuning screw 32 to have a tendency to expand axially, so that the threads of the tuning screw 32 abut against the threads of the threaded hole of the cover plate 20, thereby locking the relative positions of the tuning screw 32 and the cover plate 20, i.e., the relative positions of the resonator 30 and the cover plate 20. For the specific structure of the self-locking tuning screw, reference may be made to other related technologies, which are not described herein again.
In actual use, the cylinder 31 of the resonator 30 is located inside the cavity filter. That is, it is difficult for an operator to adjust the relative position of the resonator 30 by rotating the cylinder of the resonator 30. Thus, to facilitate adjustment, an adjustment portion may be provided at the end of the tuning screw 32 that extends beyond the cover plate 20.
Referring to fig. 2, the adjusting portion 321a may be a prism structure, such as a regular hexagonal prism structure, so that a regular tool (such as a wrench) can be conveniently used to rotate the tuning screw 32, thereby adjusting the position of the resonator 30. Wherein the diagonal distance of the hexagonal prism structure should be smaller than the inner diameter of the threaded hole of the cover plate 20 to facilitate the extension of a portion of the tuning screw 32 out of the cover plate 20 from the threaded hole during installation.
Referring to fig. 3, the adjusting portion 321b may alternatively be a cylindrical structure, and a straight groove may be formed on an end surface of the cylindrical structure, so that a common tool (for example, a straight tool) may be conveniently used to rotate the tuning screw 32, thereby adjusting the position of the resonator 30. Of course, a cross groove or a rice groove may be formed on the end surface of the cylindrical structure. Similarly, to facilitate installation by extending a portion of the tuning screw 32 out of the cover plate 20 through the threaded hole, the diameter of the cylindrical structure should be less than the inner diameter of the threaded hole of the cover plate 20.
It will be appreciated that the adjustment portion of the tuning screw 32 may be a combination of the above configurations, or other configurations that facilitate adjustment by an operator using a tool or by hand, and is not limited herein.
In some embodiments, the resonator 30 may be entirely made of the same metal, and in other embodiments, the resonator 30 may be made of two or more metals through an integral molding process, a welding process, or the like. In this way, the resonator 30 can be formed by butt-jointing metal materials with different thermal expansion coefficients, so as to compensate the influence of thermal expansion and contraction of metal on the frequency of the resonant cavity under different use temperature conditions, and the corresponding resonant unit can keep stable resonant frequency under different temperature environments.
Specifically, as shown in fig. 4, the cylinder 31 of the resonator 30 may include a first portion 311 connected to the tuning screw 32 and a second portion 322 connected to the first portion 311, and the first portion 311 and the second portion 322 are made of different metal materials.
Wherein the resonator 30 may further comprise a resonance disk 33, the resonance disk 33 being arranged at an end of the cylinder 31 remote from the tuning screw 32, i.e. the end of the cylinder 31 provided with the opening. Correspondingly, the resonant disk 33 is of a hollow structure, so that an opening is formed at an end of the cylinder 31 remote from the tuning screw 32.
Alternatively, the resonant disk 33 and the cylinder 31 may be made of different metal materials. That is, the first part 311, the second part 322 and the resonant disk 33 of the cylinder 31 may be made of at least two different metal materials to compensate for the resonant frequency of the resonant unit at different temperatures.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the novel radio frequency communication device 500. As shown, the radio frequency communication device 500 may include a cavity filter 501 and an antenna 502, where the cavity filter 501 is coupled to the antenna 502 and filters signals received and transmitted. The cavity filter 501 may include the cavity filter of any of the embodiments described above. The radio frequency communication device 500 may be a filter, a combiner, a tower top amplifier, or the like.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A cavity filter, comprising:
a cavity;
the cover plate is covered on the cavity and surrounds the cavity together to form a resonant cavity, and a threaded hole is formed in the cover plate; and
the resonator is arranged in the resonant cavity and comprises a cylinder and a tuning screw connected with the cylinder, and one end of the cylinder, which is far away from the tuning screw, is provided with an opening;
the tuning screw rod penetrates through the threaded hole and is in threaded connection with the cover plate, so that the resonator is adjustably connected with the cover plate.
2. The cavity filter of claim 1, wherein said tuning screw is a self-locking tuning screw that mates with said threaded hole in said cover plate to secure said resonator.
3. The cavity filter of claim 1, further comprising:
a locking nut threadedly coupled to the tuning screw to secure the resonator to the cover plate.
4. The cavity filter of claim 1, wherein:
and one end of the tuning screw rod extending out of the cover plate is provided with an adjusting part.
5. The cavity filter of claim 4, wherein:
the adjusting part is of a hexagonal prism structure, and the diagonal distance of the hexagonal prism structure is smaller than the inner diameter of the threaded hole of the cover plate.
6. The cavity filter of claim 4, wherein:
the adjusting portion is of a cylindrical structure, the diameter of the cylindrical structure is smaller than the inner diameter of the threaded hole of the cover plate, and a straight groove, a cross groove or a cross groove are formed in the end face of the cylindrical structure.
7. The cavity filter of claim 1, wherein:
the barrel includes a first portion connected to the tuning screw and a second portion connected to the first portion, wherein the first portion and the second portion are made of different metallic materials.
8. The cavity filter of claim 1, wherein:
the resonator also comprises a resonant disc, wherein the resonant disc is arranged at one end of the cylinder body far away from the tuning screw rod, the resonant disc is of a hollow structure, and therefore the opening is formed at one end of the cylinder body far away from the tuning screw rod;
the resonant disc and the cylinder are made of different metal materials.
9. A radio frequency communication device comprising an antenna and a cavity filter, the antenna being coupled to the cavity filter, wherein the cavity filter is the cavity filter of any one of claims 1-8.
10. The radio frequency communication device of claim 9, wherein the radio frequency communication device is a filter, a combiner, or a tower mounted amplifier.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNPCT/CN2018/125916 | 2018-12-29 | ||
| CN2018125916 | 2018-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111384537A true CN111384537A (en) | 2020-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910208815.1A Pending CN111384537A (en) | 2018-12-29 | 2019-03-19 | Cavity filter and radio frequency communication equipment |
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| CN (1) | CN111384537A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112612198A (en) * | 2020-12-22 | 2021-04-06 | 中国计量科学研究院 | Temperature immune microwave resonator for cold atom fountain clock |
| CN114696051A (en) * | 2022-04-14 | 2022-07-01 | 京信射频技术(广州)有限公司 | Filter and communication device |
| CN115295986A (en) * | 2022-08-09 | 2022-11-04 | 深圳国人科技股份有限公司 | Adjustable filter |
| CN116014404A (en) * | 2023-03-28 | 2023-04-25 | 京信射频技术(广州)有限公司 | Resonator and filter |
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| CN202050043U (en) * | 2011-02-25 | 2011-11-23 | 深圳市大富科技股份有限公司 | Cavity filter and communication equipment |
| CN102751554A (en) * | 2012-06-29 | 2012-10-24 | 摩比天线技术（深圳）有限公司 | Mixed-mode filter |
| CN204230392U (en) * | 2014-10-10 | 2015-03-25 | 摩比天线技术（深圳）有限公司 | A kind of filter |
| CN205911405U (en) * | 2016-06-13 | 2017-01-25 | 摩比天线技术（深圳）有限公司 | Novel resonant cavity and wave filter thereof |
| CN207967266U (en) * | 2018-03-21 | 2018-10-12 | 东莞市冠顺实业有限公司 | A kind of adjustable resonant rod |
| KR20180117324A (en) * | 2017-04-19 | 2018-10-29 | (주)에드모텍 | The frequency-variable filter improving insertion loss |
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2019
- 2019-03-19 CN CN201910208815.1A patent/CN111384537A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202050043U (en) * | 2011-02-25 | 2011-11-23 | 深圳市大富科技股份有限公司 | Cavity filter and communication equipment |
| CN102751554A (en) * | 2012-06-29 | 2012-10-24 | 摩比天线技术（深圳）有限公司 | Mixed-mode filter |
| CN204230392U (en) * | 2014-10-10 | 2015-03-25 | 摩比天线技术（深圳）有限公司 | A kind of filter |
| CN205911405U (en) * | 2016-06-13 | 2017-01-25 | 摩比天线技术（深圳）有限公司 | Novel resonant cavity and wave filter thereof |
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| CN207967266U (en) * | 2018-03-21 | 2018-10-12 | 东莞市冠顺实业有限公司 | A kind of adjustable resonant rod |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112612198A (en) * | 2020-12-22 | 2021-04-06 | 中国计量科学研究院 | Temperature immune microwave resonator for cold atom fountain clock |
| CN114696051A (en) * | 2022-04-14 | 2022-07-01 | 京信射频技术(广州)有限公司 | Filter and communication device |
| CN114696051B (en) * | 2022-04-14 | 2024-05-28 | 京信射频技术(广州)有限公司 | Filter and communication device |
| CN115295986A (en) * | 2022-08-09 | 2022-11-04 | 深圳国人科技股份有限公司 | Adjustable filter |
| CN115295986B (en) * | 2022-08-09 | 2024-05-17 | 深圳国人科技股份有限公司 | Adjustable filter |
| CN116014404A (en) * | 2023-03-28 | 2023-04-25 | 京信射频技术(广州)有限公司 | Resonator and filter |
| CN116014404B (en) * | 2023-03-28 | 2023-06-23 | 京信射频技术(广州)有限公司 | Resonator and filter |
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Application publication date: 20200707 |
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