CN115295986B - Adjustable filter - Google Patents
Adjustable filter Download PDFInfo
- Publication number
- CN115295986B CN115295986B CN202210951217.5A CN202210951217A CN115295986B CN 115295986 B CN115295986 B CN 115295986B CN 202210951217 A CN202210951217 A CN 202210951217A CN 115295986 B CN115295986 B CN 115295986B
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- Prior art keywords
- piece
- tuning
- rod
- thread
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000002184 metal Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 238000012856 packing Methods 0.000 description 5
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
-
- 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
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to a tunable filter, which comprises a cavity with an opening at one end, a resonant column arranged in the cavity, a cover plate arranged at the opening end of the cavity and a tuning component, wherein the tuning component comprises a tuning screw rod and a tuning piece; the first thread section comprises a rod piece and a ring package piece for surrounding the rod piece, one of the rod piece and the ring package piece is a metal piece, the other one of the rod piece and the ring package piece is a plastic piece, and the first thread section is provided with a first thread; the first threaded section passes through the through hole of the cover plate and is in threaded connection with the through hole, so that the tuning piece is positioned in the cavity and is opposite to the resonance column, and the tuning piece is insulated from the cover plate and can move relative to the resonance column when the tuning screw rotates relative to the cover plate. The invention effectively solves the problem of unstable tuning index of the filter caused by insufficient plastic strength and deformation of the tuning screw.
Description
[ Field of technology ]
The invention relates to the technical field of radio frequency communication, in particular to an adjustable filter.
[ Background Art ]
At present, a radio frequency device is generally tuned by adopting a mode that a tuning screw rod stretches into a resonant cavity, the tuning screw rod penetrates through a cover plate to enter the resonant cavity, and a tuning component is arranged at the lower end of the tuning screw rod. Plastic screws are commonly used for the tuning screws because of the insulation from the cover plate. However, in application, the plastic screw is often not enough and is easy to break due to the insufficient connection strength, and even in the environment of high and low temperature test or large temperature difference, the screw is easy to deform, so that the product index is unstable.
With the development of the technical field of radio frequency communication, the frequency band is higher, the index is stricter, and the traditional pure plastic screw is more and more difficult to meet the requirements of stability, reliability and the like of the frequency index of the product. Thus, a solution is needed.
[ Invention ]
The invention provides an adjustable filter, which aims to solve the problem of unstable tuning index of the filter caused by insufficient and deformed plastic strength of a tuning screw.
A tunable filter comprising a cavity having an open end, a resonant post mounted within the cavity, a cover plate mounted to the open end of the cavity; the tuning assembly comprises a tuning screw and a tuning piece, wherein the tuning screw comprises a first threaded section and a fitting mounting section, and the tuning piece is mounted on the fitting mounting section; the first thread section comprises a rod piece and a ring wrapping piece wrapping the rod piece, one of the rod piece and the ring wrapping piece is a metal piece, the other of the rod piece and the ring wrapping piece is a plastic piece, and the first thread section is provided with a first thread; the first threaded section penetrates through the through hole of the cover plate and is in threaded connection with the through hole, so that the tuning piece is located in the cavity and opposite to the resonance column, and the tuning piece is insulated from the cover plate and can move relative to the resonance column when the tuning screw rotates relative to the cover plate.
Preferably, the first thread section is of a plastic-coated gold structure or a gold-coated plastic structure.
Preferably, the first thread section is of a metal-clad plastic structure, the rod piece is a plastic piece, and the ring-clad piece is a metal piece; the outer wall of the metal piece is provided with a second thread, and the inner wall of the metal piece is provided with a third thread; the plastic piece is provided with threads meshed with the third threads; the second thread is a first thread of the first thread segment.
Preferably, the first thread segment is a plastic package Jin Jiegou; the rod member is a metal member, the ladle member is a plastic member, and the first thread of the first thread section is formed by the ladle member.
Preferably, the ring package has a through hole or a hollow out, and a part of the rod member is out from the through hole or the hollow out.
Preferably, when the rod member is a metal member, the metal member is in a shape of a straight line, a cross, a Y, a triangular prism or a polygonal prism.
Preferably, the ring package is a metal piece, the rod piece is a plastic piece, the plastic piece wraps the periphery of the metal piece from the through hole of the metal piece, and the first thread of the first thread section is formed by the plastic piece.
Preferably, the ring package is a plastic part, the rod piece is a metal part, the plastic part is provided with a hollow, the metal part extends outwards from the hollow, and the first thread of the first thread section is formed by the ring package and the rod piece together.
Further, a limiting ring is arranged between the first threaded section and the fitting mounting section, and the outer diameter of the limiting ring is larger than that of the fitting mounting section and is used for limiting the position of the tuning piece.
Further, the tuning screw is provided with an inner hole in the center of the end portion far away from the fitting mounting section, the inner hole extends along the axial direction of the tuning screw, and the inner hole forms a structure capable of being matched with a screwdriver.
Further, the device further comprises a locking piece, wherein the locking piece is a nut sleeved on the first thread section, and the nut and the tuning piece are respectively positioned on two sides of the cover plate.
The first thread section in threaded connection with the through hole of the filter cover plate is a combination of the metal piece and the plastic piece, so that the mechanical strength of the first thread section and the first thread of the first thread section is improved; the problem that the tuning index of the filter is unstable due to insufficient plastic strength and deformation of the tuning screw is effectively solved.
[ Description of the drawings ]
FIG. 1 is a schematic cross-sectional view of a tunable filter according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a tuning assembly of the tunable filter shown in FIG. 1;
FIG. 3 is a schematic longitudinal cross-sectional view of a tuning screw provided by another embodiment;
fig. 4 is a schematic cross-sectional view of the tuning screw shown in fig. 3.
[ Detailed description ] of the invention
The invention is further described below with reference to the drawings and examples.
Referring to fig. 1 to 2, the tunable filter 300 provided by the present invention includes a cavity 150 having one end opened, a resonating post 200 installed into the cavity 150, a cover plate 280 installed to the open end of the cavity 150, and a tuning assembly 100.
Wherein,
The tuning assembly 100 includes a tuning screw 3 and a tuning member 6. The tuning screw 3 comprises a first threaded section 30 and a fitting mounting section 35. The first threaded section 30 passes through and is threadedly coupled with the through hole of the cover plate 280, and the tuning element 6 is mounted to the fitting mounting section 35. The tuning member 6 is insulated from the cover plate 280. In this embodiment, the first threaded section 30 and the fitting mounting section 35 are insulated from each other, thereby insulating the tuning member 6 from the cover plate 280.
The tuning element 6 is located in the cavity 150 opposite to the resonator column 200, and the tuning element 6 is movable with respect to the resonator column 200 when the tuning screw 3 rotates with respect to the cover plate 280, mainly, rotates and lifts with respect to the resonator column 200 to perform frequency tuning of the filter. It will be appreciated that one function of the first threaded section 30 is to adjust the distance between the tuning element 6 and the resonant cylinder 200 by rotation relative to the cover plate 280 to raise and lower relative to the cover plate 280, thereby performing frequency tuning of the filter.
The tuning screw 3 is provided with an inner hole at the center of the end portion remote from the accessory mounting section 35, the inner hole extending in the axial direction of the tuning screw 3, the inner hole being formed with a structure that can be fitted with a screwdriver so that the screwdriver rotates the first screw section 30 relative to the screw thread of the through hole of the cover plate 280 through the structure of the inner hole, and tuning of the frequency index is performed.
Further, the tunable filter 300 further includes a locking member 290 for locking the threaded connection between the first threaded section 30 and the through hole of the cover plate 280 in a stable state with a set frequency index, so as to further enhance tuning stability of the frequency index. In a specific embodiment, referring to fig. 1, the locking member 290 is a nut that is threaded onto the first threaded section 30, the nut and tuning member 6 being located on opposite sides of the cover plate 280.
The present invention particularly improves the first thread segments 30 where the impact of stability of the tuning of the frequency index is most critical. Specifically, the first thread segment 30 is a combination of a metal piece and a plastic piece, and the combination is formed with the first thread 301 of the first thread segment 30. The first thread 301 is the thread of the tuning screw 3 which is screwed with the cover plate 280. Thus, the metal piece increases the mechanical strength of the first thread segment 30, and the first thread segment 30 is not easy to break when the first thread 301 is in threaded connection with the through hole of the cover plate 280; the metal piece is not deformed under the temperature difference of high and low temperature compared with the plastic piece; thereby ensuring that the first thread segments 30 are stably threadedly coupled to the cover plate 280 to meet the stability requirements of frequency index tuning.
As shown in fig. 1 and 2, the tuning screw 3 includes a rod 32 and a ring-shaped packing 31, the rod 32 is rod-shaped, the ring-shaped packing 31 is ring-shaped, and the ring-shaped packing 31 is fitted around the outer periphery of the rod 32. The outer wall of the ladle 31 is provided with a second thread 311 and the inner wall thereof is provided with a third thread 312. The second thread 311 serves as the first thread 301 of the first thread segment 30.
In one version, the rod 32 is a plastic member, the ring wrap 31 is a metal member, and the first thread segment 30 is a gold-clad plastic structure. Preferably, the rod 32 may have a thread 321 engaged with the pack 31 at a position corresponding to the pack 31, and the thread 321 is engaged with the third thread 312 of the inner wall of the pack 31, thereby reinforcing the connection therebetween. Because the rod 32 is insulated and the fitting mounting section 35 is integrally formed with the rod 35, the fitting mounting section 35 is insulated from the ladle 31, and even if the tuning screw 3 is screwed with the cover plate 280 by the second screw 311, the fitting mounting section 35 is still insulated from the cover plate 280.
In this embodiment, the rod-shaped member 32 made of plastic material is matched with the ring-shaped member 31 made of metal material, so that the production cost of the tuning screw 3 is reduced, the tuning screw 3 and the tunable filter 300 are lighter, and the problem that the tuning index of the filter is unstable due to insufficient plastic strength and deformation of the conventional tuning screw is solved.
The tuning screw 3 further comprises a stop collar 39. A stop collar 39 is disposed between the first threaded section 30 and the fitting mounting section 35. The stop collar 39 has an outer diameter greater than the outer diameter of the fitting mounting section 35 for defining the position of the tuning member 6. Further, when the tuning piece 6 is mounted on the fitting mounting section 35, the tuning piece 6 can also abut against the limiting ring 39, and the tuning piece 6 is respectively connected with the fitting mounting section 35 and the limiting ring 39 through adhesive. In this way, the stop ring 39 also enhances the stability of the connection of the tuning piece 6 to the tuning screw 3.
Preferably, the stop ring 39 is integrally formed with the rod 32 of plastic material, and is an insulator, so as to ensure that the tuning element 6, against which it is connected, is insulated from the cover plate 280 and the cavity 150.
Preferably, the outer diameter of the metal ring 31 is substantially the same as the outer diameter of the other portions of the plastic rod 32, so that the rod body of the tuning screw 3 has substantially the same outer diameter as a whole. The rod 32 is provided with a second thread section 37 at the end remote from the fitting mounting section 35, the second thread section 37 being adjacent to the first thread section 30 and having the same outer diameter, and the threads of the second thread section 37 being identical in texture and being matingly connected to the first thread 301.
In the case where the ladle 31 is a metal piece, the first thread 301 of the first thread segment 30 may be formed entirely of the ladle 31. In the alternative, the ladle 31 has a through hole, from which a portion of the stem 32 comes out, in which case the first thread 301 of the first thread segment 30 may be formed entirely by the stem 32 or by the ladle 31 together with the stem 32.
In another alternative, the rod 32 is a metal piece, the ring wrap 31 is a plastic piece, and the first thread segment 30 is a plastic-clad metal structure. It will be appreciated that the first thread 301 of the first thread segment 30 may be formed entirely of the annular wrapper 31. More preferably, however, the collar 31 has a through-hole from which a portion of the stem 32 protrudes outwardly, and the first thread 301 of the first thread segment 30 may be formed by the collar 31, the stem 32 together.
In the above scheme, between the rod 32 and the hoop 31, the rod 32 is reinforced by the screw 321 engaged with the hoop 31. In other embodiments, in order to improve the stability of the connection between the ring packing member 31 and the rod member 32, when the rod member 32 is made of metal, the rod member 32 may be a rectangular plate, a cross-shaped member, a Y-shaped member, a triangular prism shape or a polygonal prism shape at the first threaded section 30, so that the ring packing member 31 and the rod member 32 are not easy to move relatively during the rotation of the tuning screw 3.
Referring to fig. 3 and 4, the main difference from the embodiment of fig. 1 and 2 is that in the embodiment of fig. 1 and 2, the tuning screw 3 is formed entirely by a rod member 32, with the exception of the addition of a collar 31 to the first threaded section 30. Whereas in the embodiment shown in fig. 3 and 4 the tuning screw 3 is formed entirely by the collar 31, the rod 32 is embedded within the collar 31. The ring pack 31 has peripheral threads 315. Rod 32 still has threads 321 that engage with the ladle 31. Preferably, the rod 32 is a metal member, and the rod 32 is in a shape of a straight line, a cross, a Y, a triangular prism or a polygonal prism at the first thread segment 30 to strengthen the connection of the ladle 31 and the rod 32.
Similarly, the ring member 31 may have a hollow corresponding to the rod member 32, which may be a plurality of discrete holes or elongated slots, and a portion of the rod member 32 extends outwardly from the hollow, and the ring member 31 and the rod member 32 together form the first thread 301 of the first thread segment 30.
For example: referring to fig. 3 and 4, the cross-shaped rod 32 exposes a threaded portion of the hollow elongated slot of the ring package 31, which is, for example, four symmetrically distributed letters I, as a part of the threads 321. Thus, the portions of the rod 32, such as the four symmetrical letter I threads 321, cooperate with the peripheral threads 315 of the ring pack 31 to form the first threads 301 of the first thread segments 30. However, the shape of the rod 32 is not limited to the cross shape, and may be a straight line shape, a Y shape, a triangular prism shape, a polygonal prism shape, or the like. By the above structure, the mechanical strength of the first thread segments 30 can be enhanced.
The foregoing examples only illustrate preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that modifications and improvements can be made without departing from the spirit of the invention, such as combining different features of the various embodiments, which are all within the scope of the invention.
Claims (5)
1. A tunable filter comprising a cavity having an open end, a resonant post mounted within the cavity, a cover plate mounted to the open end of the cavity; the device is characterized by further comprising a tuning assembly, wherein the tuning assembly comprises a tuning screw and a tuning piece, the tuning screw comprises a first threaded section and a fitting mounting section, and the tuning piece is mounted on the fitting mounting section; the first thread section comprises a rod piece and a ring wrapping piece wrapping the rod piece, one of the rod piece and the ring wrapping piece is a metal piece, the other of the rod piece and the ring wrapping piece is a plastic piece, and the first thread section is provided with a first thread; the first threaded section penetrates through the through hole of the cover plate and is in threaded connection with the through hole, so that the tuning piece is located in the cavity and opposite to the resonance column, and the tuning piece is insulated from the cover plate and can move relative to the resonance column when the tuning screw rod rotates relative to the cover plate; the first thread section is of a plastic-coated gold structure or a gold-coated plastic structure; the ring package is provided with a through hole or a hollow hole, a part of the rod piece outwards extends out of the through hole or the hollow hole, and the first thread of the first thread section is formed by the ring package and the rod piece together; the gold-coated plastic structure is as follows: the rod piece is a plastic piece, the ring package piece is a metal piece, and the plastic piece is outwards discharged from a through hole or a hollow of the metal piece; the plastic package gold structure is as follows: the rod piece is a metal piece, and the ladle piece is a plastic piece; the metal piece is outwards discharged from the through hole or the hollow of the plastic piece.
2. The tunable filter of claim 1, wherein when the rod is a metal member, the metal member is in a shape of a straight line, a cross, a Y, a triangular prism, or a polygonal prism.
3. The tunable filter of claim 1, wherein a stop collar is disposed between the first threaded section and the fitting mounting section, the stop collar having an outer diameter greater than an outer diameter of the fitting mounting section for defining the position of the tuning member.
4. The tunable filter of claim 1, wherein the tuning screw has an internal bore in a center of an end remote from the fitting mounting section, the internal bore extending in an axial direction of the tuning screw, the internal bore forming a structure that is mateable with a screwdriver.
5. The tunable filter of claim 1, further comprising a locking member that is a nut that is sleeved to the first threaded section, the nut and the tuning member being located on opposite sides of the cover plate, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210951217.5A CN115295986B (en) | 2022-08-09 | 2022-08-09 | Adjustable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210951217.5A CN115295986B (en) | 2022-08-09 | 2022-08-09 | Adjustable filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115295986A CN115295986A (en) | 2022-11-04 |
| CN115295986B true CN115295986B (en) | 2024-05-17 |
Family
ID=83829089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210951217.5A Active CN115295986B (en) | 2022-08-09 | 2022-08-09 | Adjustable filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115295986B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4647883A (en) * | 1983-08-27 | 1987-03-03 | Oxley Robert Frederick | Tuning screw having a resilient plastics bush which supports the tuning plunger within a metal bush |
| CN1355946A (en) * | 1999-04-14 | 2002-06-26 | 艾利森电话股份有限公司 | Tuning arrangement |
| CN101315999A (en) * | 2008-06-27 | 2008-12-03 | 华为技术有限公司 | Screw device and cavity filter using the same |
| CN104539753A (en) * | 2014-11-06 | 2015-04-22 | 广东欧珀移动通信有限公司 | Mobile phone battery case and forming process thereof |
| CN107112614A (en) * | 2014-12-31 | 2017-08-29 | 深圳市大富科技股份有限公司 | Tuning screw and its manufacture method, cavity body filter, communication equipment |
| CN206595371U (en) * | 2017-03-02 | 2017-10-27 | 艾迪康科技（苏州）有限公司 | Coaxial cavity filter and its tuning block |
| CN110148823A (en) * | 2019-06-20 | 2019-08-20 | 东莞鸿爱斯通信科技有限公司 | Tuning block and cavity body filter for cavity body filter |
| CN111384537A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Cavity filter and radio frequency communication equipment |
| CN113334738A (en) * | 2021-06-11 | 2021-09-03 | 中山市广聚塑料制品有限公司 | Novel plastic part production process and novel plastic part |
| CN214274495U (en) * | 2020-12-30 | 2021-09-24 | 苏州可邦自控阀业有限公司 | High-strength pneumatic regulating valve |
| CN214848976U (en) * | 2021-04-20 | 2021-11-23 | 武汉凡谷电子技术股份有限公司 | Filter tuning screw and filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017005731A1 (en) * | 2015-07-06 | 2017-01-12 | Commscope Italy S.R.L | Resonant cavity filters with high performance tuning screws |
-
2022
- 2022-08-09 CN CN202210951217.5A patent/CN115295986B/en active Active
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|---|---|---|---|---|
| US4647883A (en) * | 1983-08-27 | 1987-03-03 | Oxley Robert Frederick | Tuning screw having a resilient plastics bush which supports the tuning plunger within a metal bush |
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| CN206595371U (en) * | 2017-03-02 | 2017-10-27 | 艾迪康科技（苏州）有限公司 | Coaxial cavity filter and its tuning block |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115295986A (en) | 2022-11-04 |
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