CN108879046B - Cavity filter - Google Patents
Cavity filter Download PDFInfo
- Publication number
- CN108879046B CN108879046B CN201810721905.6A CN201810721905A CN108879046B CN 108879046 B CN108879046 B CN 108879046B CN 201810721905 A CN201810721905 A CN 201810721905A CN 108879046 B CN108879046 B CN 108879046B
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- lightning protection
- cavity
- conductive connecting
- connecting piece
- electrically connected
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- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
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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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- Details Of Aerials (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention provides a cavity filter which comprises a cavity, a lightning protection structure and a conductive connecting piece. A plurality of resonant cavities and a common cavity are arranged in the cavity; each resonant cavity is arranged around the common cavity and is respectively coupled and connected with the common cavity through respective coupling windows; the cavity is provided with a transmission port, and the transmission port corresponds to the public cavity; the lightning protection structure is arranged corresponding to the transmission port and is connected with the transmission port; the lightning protection structure comprises a lightning protection inductor, a lightning protection plate and a lightning protection main rod which are respectively and electrically connected to two ends of the lightning protection inductor; one end of the conductive connecting piece is electrically connected with the common cavity, and the other end of the conductive connecting piece is electrically connected with the lightning protection main rod of the lightning protection structure; the conductive connecting piece is sheet-shaped and is matched with the transmission port. The conductive connecting piece adopts a sheet structure, so that the hardness of the conductive connecting piece can be ensured, the conductive connecting piece is not easy to deform, and the conductive connecting piece is matched with a transmission port, so that the port delay value of the filter is stable.
Description
Technical Field
The invention relates to the field of communication, in particular to a cavity filter.
Background
The cavity filter is widely applied to the field of communication as a frequency selection device, and is mainly used for selecting communication signals and filtering clutter or interference signals out of the communication signal frequency in a communication base station system. With the development of modern communication technology, increasingly strict requirements are put on the performance, volume and weight of communication equipment, which leads to the inevitable trend of miniaturization of cavity filters.
Thunder and lightning is a common natural disaster, electrical equipment connected with a communication line is often damaged, and a cavity filter is used as key equipment for transmitting and receiving signals. When the cavity filter is used, the lightning protection design must be considered, the existing cavity filter lightning protection design generally adopts a mode of port grounding, a silver-plated wire is adopted, one end of the silver-plated wire is connected to the cavity filter, and the other end of the silver-plated wire is grounded. The grounding of the port of the cavity filter not only causes the performance of the residual voltage index of the lightning protection channel to be poor, but also causes the diameter of the silver-plated wire to be between 1.5mm and 3mm due to the limited space of the cavity filter, so that the silver-plated wire is easy to deform, the impedance of the silver-plated wire cannot reach a required value after the silver-plated wire deforms, the mismatching between the cavity and the silver-plated wire can be caused, the time delay data of the port is unstable, and finally the cavity filter is difficult to achieve the ideal time delay strength of the port.
Disclosure of Invention
The invention aims to provide a cavity filter to solve the problems in the prior art.
In order to solve the above technical problem, the present invention provides a cavity filter, including: the cavity is internally provided with a plurality of resonant cavities and a common cavity; each resonant cavity is arranged around the common cavity and is respectively coupled and connected with the common cavity through respective coupling windows; a transmission port is arranged on the cavity body and corresponds to the public cavity; the lightning protection structure is arranged corresponding to the transmission port and is connected with the transmission port; the lightning protection structure comprises a lightning protection inductor, a lightning protection plate and a lightning protection main rod which are electrically connected to two ends of the lightning protection inductor respectively; one end of the conductive connecting piece is electrically connected with the common cavity, and the other end of the conductive connecting piece is electrically connected with the lightning protection main rod of the lightning protection structure; the conductive connecting piece is sheet-shaped and is matched with the transmission port.
Preferably, the conductive connecting piece is made of copper; the conductive connecting piece is manufactured through a wire cutting process.
Preferably, the conductive connecting piece is further provided with a fixing piece outside, and the fixing piece is made of polytetrafluoroethylene.
Preferably, the fixing parts are arranged at intervals along the length direction of the conductive connecting part.
Preferably, the impedance of the conductive connection is 50 ohms.
Preferably, the lightning protection main rod includes: one end of the inner core is electrically connected with the conductive connecting piece; the insulating layer is a cylindrical cavity with one open end and is arranged on the periphery of the inner core; the conducting layer is a cylindrical cavity with one open end and is arranged on the periphery of the insulating layer; the conducting layer is electrically connected with one end of the lightning protection inductor.
Preferably, the materials of the inner core and the conductive layer are both aluminum or copper; the insulating layer is made of polytetrafluoroethylene.
Preferably, the lightning protection main rod and the lightning protection plate are arranged at an interval from top to bottom, and the lightning protection inductor is arranged between the lightning protection main rod and the lightning protection plate.
Preferably, the lightning protection plate comprises a lightning protection circuit board and a lightning protection device electrically connected with the lightning protection circuit board, and the lightning protection circuit board is electrically connected with the lightning protection inductor; the lightning protection device is arranged on one side of the lightning protection circuit board far away from the lightning protection main rod.
Preferably, the conductive connector is electrically connected to the common cavity via a port tap line.
According to the technical scheme, the invention has the advantages and positive effects that: the cavity filter comprises a cavity, a lightning protection structure and a conductive connecting piece for connecting the cavity and the lightning protection structure. The conductive connecting piece adopts a sheet structure, so that the hardness of the conductive connecting piece is ensured to ensure that the conductive connecting piece is not easy to deform, and the conductive connecting piece is matched with the transmission port, so that the port delay value of the filter is stable. And the cavity filter adopts a common cavity coupling mode, so that the mutual influence among filter channels is avoided, and the cavity filter is better matched with a transmission port. Furthermore, the common cavity is connected with the outside through the port tap lines, so that the number of the port tap lines is reduced. The lightning protection structure adopts a hollow coupling structure, so that the lightning protection performance is more optimized, and the cavity filter is better protected. Making the manufacture of the cavity filter simpler.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of a cavity filter of the present invention;
FIG. 2 is a schematic diagram of the common cavity coupling of the present invention;
fig. 3 is a schematic view of a preferred embodiment of a lightning protection structure.
Wherein the reference numerals are as follows: 1. a cavity filter; 11. a cavity; 111. a resonant cavity; 112. a common cavity; 1121. a port tap line; 12. a lightning protection structure; 121. a lightning protection plate; 122. lightning protection inductance; 123. the lightning protection main rod; 1231. an inner core; 1232. an insulating layer; 1233. a conductive layer; 13. a conductive connection member.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
Referring to fig. 1 to 3, the present invention provides a cavity filter 1, which includes a cavity 11, a lightning protection structure 12, and a conductive connecting member 13 connecting the cavity 11 and the lightning protection structure 12. The conductive connecting piece 13 is sheet-shaped, has high hardness, is not easy to deform, and is matched with the transmission port on the cavity 11, so that the port delay value of the cavity filter 1 is stable.
Specifically, the impedance of the conductive connection 13 is 50 ohms. Not only can the hardness of the conductive connecting piece 13 be ensured to make the conductive connecting piece not easy to deform, but also the conductive connecting piece is matched with a transmission port, so that the port delay value of the cavity filter 1 is stable. In this embodiment, the conductive connecting member 13 is made of copper. In other embodiments, the conductive connecting member 13 may also be made of iron or other good electrical conductor material.
In this embodiment, the sheet-shaped conductive connecting member 13 is manufactured by a wire cutting process, which has high processing accuracy and high material and energy utilization rate. In other embodiments, the conductive connecting member 13 may be made by etching.
Preferably, the conductive connecting member 13 is further provided with a fixing member at an outer portion thereof for fixing the conductive connecting member 13. Further, the fixing members are provided at intervals along the length direction of the conductive connecting member 13. The conductive connecting piece 13 can be better stabilized without influencing the signal transmission. Specifically, in this embodiment, the fixing member is made of teflon.
Referring to fig. 2, a common cavity 112 and three resonant cavities 111 surrounding the common cavity 112 are disposed in the cavity 11. The common cavity 112 corresponds to the transmission port, and the three resonant cavities 111 are arranged in parallel so that the cavity filter 1 has three filter channels. The resonant cavities 111 are coupled with the common cavity 112 through respective coupling windows, so that mutual influence among filter channels is avoided, and the resonant cavities are better matched with transmission ports. The common cavity 112 is connected to the conductive connection 13 through the port tap line 1121, so that the number of port tap lines is reduced, and the manufacturing of the cavity filter 1 is simpler. In other embodiments, more resonant cavities 111 may be arranged in parallel, and resonant cavities may be arranged in series between each resonant cavity 111 arranged in parallel and the common cavity 112, which is selected according to actual needs.
Specifically, the present embodiment is described by taking a transmission port as an input port as an example, that is, the input port is connected to the lightning protection structure 12 and connected to the input port through the conductive connecting member 13. In other embodiments, the transmission port may be an output port, that is, the output port is connected to the lightning protection structure 12 and connected to the output port through the conductive connecting member 13. The lightning protection structure 12 may be disposed only at the input port or the output port according to actual needs, or the lightning protection structure 12 may be disposed at the input port and the output port simultaneously.
Referring to fig. 3, the lightning protection structure 12 includes a lightning protection inductor 122, and a lightning protection plate 121 and a lightning protection main rod 123 electrically connected to two ends of the lightning protection inductor 122, respectively.
In this embodiment, the lightning protection structure 12 further includes a housing, the housing has a built-in space, and the lightning protection inductor 122, the lightning protection plate 121, and the lightning protection main rod 123 are disposed in the built-in space. Preferably, the lightning protection sheet 121 includes a lightning protection circuit board and a lightning protection device. The lightning protection device is electrically connected with the lightning protection circuit board, and the lightning protection circuit board is electrically connected with the lightning protection inductor 122.
Furthermore, the lightning protection main rod 123 and the lightning protection plate 121 are arranged at an upper and lower interval, and the lightning protection inductor 122 is arranged between the lightning protection main rod 123 and the lightning protection plate 121, so that the spatial layout is more reasonable. The lightning protection device is arranged on one side of the lightning protection circuit board far away from the lightning protection main rod 123.
The lightning protection main rod 123 includes an inner core 1231, an insulating layer 1232, and a conductive layer 1233, which are sequentially disposed from inside to outside. Specifically, in the present embodiment, the inner core 1231, the insulating layer 1232, and the conductive layer 1233 are coaxially disposed.
One end of the inner core 1231 is electrically connected to the conductive connection member 13. Preferably, the material of the inner core 1231 is aluminum or copper. The insulating layer 1232 is a cylindrical cavity with an open end and is disposed on the outer periphery of the inner core 1231. Preferably, the material of the insulating layer 1232 is teflon. The conductive layer 1233 is a cylindrical cavity with an open end and is disposed on the periphery of the insulating layer 1232, and the conductive layer 1233 is electrically connected to one end of the lightning protection inductor 122. Preferably, the material of the conductive layer 1233 is aluminum or copper. Because the insulating layer 1232 is arranged between the inner core 1231 and the conductive layer 1233, the lightning protection main rod 123 forms a hollow coupling structure, and the hollow coupling structure transmits signals through the coupling of the inner core 1231 and the conductive layer 1233, thereby avoiding the influence of other various signals and optimizing the lightning protection index.
In this embodiment, a gap is formed between the inner core 1231 and the insulating layer 1232. In other embodiments, the inner core 1231 and the insulating layer 1232 may be disposed without a gap therebetween.
Further, the material of the housing is aluminum, and when the lightning protection inductor 122 is disposed in the internal space of the housing, a medium is disposed at a contact position between the lightning protection inductor 122 and the inside of the housing, so that the lightning protection inductor 122 is not conducted with the housing.
The signal transmission process of the cavity filter 1 of the present embodiment is as follows: the signal firstly passes through the lightning protection plate 121 of the lightning protection structure 12 and then is transmitted to the lightning protection main rod 123 through the lightning protection inductor 122, the conductive layer 1233 of the lightning protection main rod 123 transmits the signal to the inner core 1231 through coupling, the inner core 1231 transmits the signal to the port tap line 1121 through the conductive connecting member 13 to reach the common cavity 112, and the common cavity 112 transmits the signal to each resonant cavity 111 through a coupling mode. The lightning protection device of the lightning protection plate 121 can absorb the lightning in the signal, so that the signal reaching the common cavity 112 does not contain the lightning, and the cavity filter 1 is protected.
According to the technical scheme, the invention has the advantages and positive effects that: the cavity filter comprises a cavity, a lightning protection structure and a conductive connecting piece for connecting the cavity and the lightning protection structure. The conductive connecting piece adopts a sheet structure, so that the hardness of the conductive connecting piece is ensured to ensure that the conductive connecting piece is not easy to deform, and the conductive connecting piece is matched with the transmission port, so that the port delay value of the filter is stable. And the cavity filter adopts a common cavity coupling mode, so that the mutual influence among filter channels is avoided, and the cavity filter is better matched with a transmission port. Furthermore, the common cavity is connected with the outside through the port tap lines, so that the number of the port tap lines is reduced. The lightning protection structure adopts a hollow coupling structure, so that the lightning protection performance is more optimized, and the cavity filter is better protected.
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 scope of the present invention, but rather is intended to cover all equivalent structural changes made by the use of the specification and drawings.
Claims (10)
1. A cavity filter, comprising:
the cavity is internally provided with a plurality of resonant cavities and a common cavity; each resonant cavity is arranged around the common cavity and is respectively coupled and connected with the common cavity through respective coupling windows; a transmission port is arranged on the cavity body and corresponds to the public cavity;
the lightning protection structure is arranged corresponding to the transmission port and is connected with the transmission port; the lightning protection structure comprises a lightning protection inductor, a lightning protection plate and a lightning protection main rod which are electrically connected to two ends of the lightning protection inductor respectively; the lightning protection main rod and the lightning protection plate are arranged at intervals up and down, and the lightning protection inductor is arranged between the lightning protection main rod and the lightning protection plate;
one end of the conductive connecting piece is electrically connected with the common cavity, and the other end of the conductive connecting piece is electrically connected with the lightning protection main rod of the lightning protection structure; the conductive connecting piece is sheet-shaped and is matched with the transmission port.
2. The cavity filter of claim 1, wherein the conductive connecting member is made of copper;
the conductive connecting piece is manufactured through a wire cutting process.
3. The cavity filter of claim 1, wherein a fixing member is further disposed outside the conductive connecting member, and the fixing member is made of teflon.
4. The cavity filter of claim 3, wherein the fasteners are spaced apart along a length of the conductive connector.
5. The cavity filter of claim 1, wherein the impedance of the conductive connection is 50 ohms.
6. The cavity filter of claim 1, wherein the lightning protection stem comprises:
one end of the inner core is electrically connected with the conductive connecting piece;
the insulating layer is a cylindrical cavity with one open end and is arranged on the periphery of the inner core;
the conducting layer is a cylindrical cavity with one open end and is arranged on the periphery of the insulating layer; the conducting layer is electrically connected with one end of the lightning protection inductor.
7. The cavity filter of claim 6, wherein the inner core and the conductive layer are made of aluminum or copper;
the insulating layer is made of polytetrafluoroethylene.
8. The cavity filter of claim 1, wherein the lightning protection rod and the lightning protection plate are spaced apart from each other, and the lightning protection inductor is disposed between the lightning protection rod and the lightning protection plate.
9. The cavity filter of claim 8, wherein the lightning protection plate comprises a lightning protection circuit board and a lightning protection device electrically connected with the lightning protection circuit board, and the lightning protection circuit board is electrically connected with the lightning protection inductor;
the lightning protection device is arranged on one side of the lightning protection circuit board far away from the lightning protection main rod.
10. The cavity filter of claim 1, wherein the conductive connection and the common cavity are electrically connected by a port tap line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721905.6A CN108879046B (en) | 2018-07-04 | 2018-07-04 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721905.6A CN108879046B (en) | 2018-07-04 | 2018-07-04 | Cavity filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108879046A CN108879046A (en) | 2018-11-23 |
| CN108879046B true CN108879046B (en) | 2020-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810721905.6A Active CN108879046B (en) | 2018-07-04 | 2018-07-04 | Cavity filter |
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| CN (1) | CN108879046B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118044062A (en) * | 2021-09-29 | 2024-05-14 | 华为技术有限公司 | Filter, remote radio unit and base station |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2926000B2 (en) * | 1996-03-29 | 1999-07-28 | 中部電力株式会社 | Lightning protection system for waveguide |
| JP4712622B2 (en) * | 2006-06-22 | 2011-06-29 | 日本電業工作株式会社 | Tip short circuit (λ / 4) coaxial arrester |
| CN200997528Y (en) * | 2006-12-30 | 2007-12-26 | 摩比天线技术（深圳）有限公司 | Lightening-proof radio frequency module |
| CN201084808Y (en) * | 2007-09-04 | 2008-07-09 | 深圳市配天网络技术有限公司 | A lightning prevention structure for coaxial cavity wave-filter |
| CN202495561U (en) * | 2012-03-27 | 2012-10-17 | 成都市大富科技有限公司 | Cavity filter and filter cavity |
| CN204289667U (en) * | 2014-12-30 | 2015-04-22 | 宁波华瓷通信技术有限公司 | A kind of port coupled structure of filter |
| CN104882651B (en) * | 2015-05-15 | 2018-09-14 | 摩比天线技术（深圳）有限公司 | A kind of port organization and radio-frequency filter of radio-frequency filter |
| CN204651450U (en) * | 2015-06-10 | 2015-09-16 | 苏州东山精密制造股份有限公司 | Common cavity tap mechanism |
| CN205319274U (en) * | 2016-01-22 | 2016-06-15 | 宁波华瓷通信技术有限公司 | Filtering lightning protection device |
| CN205752464U (en) * | 2016-06-18 | 2016-11-30 | 上海觉浅广播器材有限公司 | Band lightning protection frequency modulation 5kW power low pass filter |
| CN206806477U (en) * | 2017-05-15 | 2017-12-26 | 常州金信诺凤市通信设备有限公司 | A kind of spiral arrester |
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2018
- 2018-07-04 CN CN201810721905.6A patent/CN108879046B/en active Active
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Denomination of invention: Cavity filter Effective date of registration: 20200930 Granted publication date: 20200211 Pledgee: Shenzhen Shendan Zengcheng Financing Guarantee Co.,Ltd. Pledgor: MOBI ANTENNA TECHNOLOGIES (SHENZHEN) Co.,Ltd.|MOBI TELECOMMUNICATIONS TECHNOLOGIES (JI'AN) Co.,Ltd.|MOBI TECHNOLOGIES (XI'AN) Co.,Ltd.|MOBI TECHNOLOGY (SHENZHEN) Co.,Ltd. Registration number: Y2020990001188 |
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Date of cancellation: 20230526 Granted publication date: 20200211 Pledgee: Shenzhen Shendan Zengcheng Financing Guarantee Co.,Ltd. Pledgor: MOBI ANTENNA TECHNOLOGIES (SHENZHEN) Co.,Ltd.|MOBI TELECOMMUNICATIONS TECHNOLOGIES (JI'AN) Co.,Ltd.|MOBI TECHNOLOGIES (XI'AN) Co.,Ltd.|MOBI TECHNOLOGY (SHENZHEN) Co.,Ltd. Registration number: Y2020990001188 |