CN107112614A - Tuning screw and its manufacture method, cavity body filter, communication equipment - Google Patents
Tuning screw and its manufacture method, cavity body filter, communication equipment Download PDFInfo
- Publication number
- CN107112614A CN107112614A CN201480084199.9A CN201480084199A CN107112614A CN 107112614 A CN107112614 A CN 107112614A CN 201480084199 A CN201480084199 A CN 201480084199A CN 107112614 A CN107112614 A CN 107112614A
- Authority
- CN
- China
- Prior art keywords
- section
- tuning
- screw
- insulating layer
- tuning screw
- 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.)
- Pending
Links
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
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention provides a kind of tuning screw and its manufacture method, cavity body filter, communication equipment, and the tuning screw includes spiro rod section and tuning section, and tuning section is connected to the first end of spiro rod section；Outer surface in tuning section has insulating barrier.The tuning screw that the present invention is provided is due to being provided with insulating barrier, the field strength on tuning screw can be reduced, reduce the current density of tuning screw and cover inner surface binding site, influence of the tuning screw to intermodulation can be greatly reduced in the case where ensureing regulating frequency, improve the intermodulation first-pass yield for producing product in enormous quantities, product repairing cost is reduced, the performance of whole product is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of communication, in particular to a tuning screw and a manufacturing method thereof, and also relates to a cavity filter and communication equipment.
[ background of the invention ]
The concept of intermodulation refers to a new frequency signal generated by two different frequency signals superimposed in a system.
When such signals fall within the reception band, normal reception by the telecommunication device will be affected. When the system is a passive system, it is called passive nonlinear intermodulation.
Passive intermodulation is mainly generated by passive nonlinear devices (such as cables, connectors, filters, etc.), and the generation of passive nonlinear intermodulation usually has two reasons: one is the nonlinearity due to metal contact and the other is the inherent nonlinearity of the material itself.
The first category is the main cause of intermodulation and is difficult to solve. The scheme mainly solves the problem of intermodulation caused by poor metal contact in the first category.
Intermodulation is an index of a filter product, and a main method tested by the inventor is to apply two constant amplitude signals with different frequencies in a transmitting frequency band of the filter, observe the influence of the intermodulation signals falling into a receiving frequency band on the receiving signals, and generally require the intermodulation signals to be lower than a certain reference value.
Therefore, at present, intermodulation is basically used as an index for measuring the nonlinearity of a device, and because an intermodulation signal generated by the intermodulation is easy to fall into a working passband to influence the normal operation of a system, a brand new design scheme is required to solve the problem.
In a passive cavity filter, the non-linearity caused by the metal contact mainly includes the following reasons:
1. the tuning screw is not firmly locked;
2. the combination surface of the tuning screw rod and the cover plate of the cavity filter is unstable and is not in full contact with 360 degrees.
When testing intermodulation, the input port of product need feed in very big power, because the debugging screw rod locking torque of cavity filter is limited, can't guarantee that apron and screw rod faying face combine very firmly, produce 360 degrees full contacts not easily, this kind of bad contact structure can produce very strong intermodulation signal.
Referring to fig. 1, fig. 1 is a simplified structural diagram of a cavity filter in the prior art.
As shown in fig. 1, the cavity filter 100 includes a cavity 110, a cover plate 120, a resonator tube 130, and a tuning screw 140.
Since the cap plate 110 is effectively combined with the tuning screw 140 by means of the screw threads, the total thickness of the cap plate 120 is only 3mm, the current density at the combined portion of the tuning screw 140 and the inner surface of the cap plate 120 is very high, and since the screw threads are always helical, the last half turn of screw threads on the inner surface of the cap plate 120 always has a tail end, and the last half turn of screw threads cannot be well tightly combined with the cap plate 120. The strong intermodulation source is formed at the joint of the tuning screw 140 and the cover plate 120, and the intermodulation first pass rate of the product is poor.
[ summary of the invention ]
The invention provides a tuning screw and a manufacturing method thereof, a cavity filter and communication equipment, and aims to solve the problem that the tuning screw in the prior art can generate strong intermodulation signals falling into a working passband to influence the normal work of a system.
In order to solve the technical problems, the invention adopts a technical scheme that: providing a tuning screw comprising:
a screw section;
a tuning section connected to a first end of the screw section;
wherein an outer surface of the tuning section has an insulating layer.
According to a preferred embodiment of the present invention, the insulating layer is a teflon layer, and the teflon layer is compounded on an outer surface of the tuning section.
According to a preferred embodiment of the present invention, the insulating layer is an insulating sleeve, and the insulating sleeve is sleeved on an outer surface of the tuning section.
According to a preferred embodiment of the invention, the outer surface of the tuning section has smooth walls.
According to a preferred embodiment of the invention, the outer end of the tuning section is ball-shaped.
According to a preferred embodiment of the present invention, the second end of the screw section is provided with a screw fitting structure, and the screw fitting structure is a recessed inner hexagon, a straight groove or a cross groove.
According to a preferred embodiment of the invention, the polytetrafluoroethylene layer has a thickness of 0.2-0.25 mm.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a cavity filter comprising:
a cavity;
the cover plate covers the cavity to form a resonant cavity;
the tuning screw penetrates through the cover plate and is inserted into the resonant cavity;
the tuning screw comprises a screw section and a tuning section connected to the first end of the screw section, the screw section is locked with the cover plate, the outer surface of the tuning section is provided with an insulating layer, and the insulating layer is used for reducing the current density at the joint of the tuning screw and the cover plate.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a communication device comprising the cavity filter as claimed in any preceding claim, the cavity filter being provided in a signal transceiving circuit portion of the communication device for selecting a signal.
In order to solve the technical problem, the invention adopts another technical scheme that: the manufacturing method of the tuning screw rod comprises the following steps:
processing a section of the metal bar into a screw section;
machining a section of a metal bar stock into a tuning section, wherein the tuning section is located at a first end of the screw section;
and arranging an insulating layer on the outer surface of the tuning section.
According to a preferred embodiment of the present invention, the step of machining a section of the metal bar stock into the tuning section comprises:
and processing the outer end of the tuning section into a ball head shape with a smooth wall.
According to a preferred embodiment of the present invention, the step of machining a section of the metal bar stock into a screw section comprises:
and processing a spiral matching structure at the second end of the screw section, wherein the spiral matching structure is a concave inner hexagon, a straight groove or a cross groove.
According to a preferred embodiment of the present invention, the step of providing an insulating layer on an outer surface of the tuning section comprises:
spraying polytetrafluoroethylene on the outer surface of the tuning section; or
And sleeving an insulating sleeve on the outer surface of the tuning section.
According to a preferred embodiment of the present invention, the step of spraying polytetrafluoroethylene on the outer surface of the tuning section further comprises:
shielding an outer surface of the screw section, wherein the shielding surface is spaced from the insulating layer by one to two turns of threads.
The invention has the beneficial effects that: different from the situation of the prior art, the tuning screw provided by the invention has the advantages that the field intensity on the tuning screw can be reduced, the current density of the combined part of the tuning screw and the inner surface of the cover plate is reduced, the influence of the tuning screw on intermodulation can be greatly reduced under the condition of ensuring the frequency adjustment, the intermodulation first pass rate of mass-produced products is improved, the maintenance cost of the products is reduced, and the performance of the whole product is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a simplified schematic diagram of a cavity filter of the prior art;
FIG. 2 is a simplified structural schematic of the tuning screw of the preferred embodiment of the present invention;
fig. 3 is a simplified flow diagram of a tuning screw manufacturing method in accordance with a preferred embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 2, fig. 2 is a simplified structural diagram of a tuning screw according to a preferred embodiment of the present invention.
As shown in fig. 2, the present invention provides a tuning screw 200, the tuning screw 200 including a screw section 210 and a tuning section 220.
The screw section 210 includes a first end 211 and a second end 212, the second end 212 of the screw section 210 is provided with a helical mating structure 214, and the helical mating structure 214 is a recessed hexagonal groove, a straight groove, a cross groove, or the like.
The tuning section 220 is connected to the first end 211 of the screw section 210, and the outer surface of the tuning section 220 has a smooth wall, preferably, the outer end of the tuning section 220 is ball-shaped, and the outer surface of the tuning section 220 has an insulating layer 222.
In a preferred embodiment, the insulating layer 222 is a Polytetrafluoroethylene (PTFE) layer, and the PTFE layer can be applied to the outer surface of the tuning section 220 by spraying.
The thickness of the teflon layer is preferably 0.2-0.25 mm, and by changing the thickness of the teflon layer, the current density at the joint of the tuning screw 210 and the inner surface of the cover plate (refer to fig. 1) can be directly changed, so as to reduce the level of intermodulation signals generated by poor contact between the tuning screw 210 and the cover plate.
In other embodiments, the insulating layer 222 may also be an insulating sleeve disposed on the outer surface of the tuning section 220.
The invention also provides a cavity filter, which comprises a cavity, a cover plate, a resonance tube and the tuning screw rod 200.
The cover plate covers the cavity to form a resonant cavity, and the resonant tube is arranged in the resonant cavity; the tuning screw 200 is inserted into the resonator tube through the cover plate, the tuning screw 200 comprises a screw section 210 and a first end tuning section 220 connected to the screw section 210, the screw section 210 is locked with the cover plate, the outer surface of the tuning section 220 is provided with an insulating layer 222, and the insulating layer 222 is used for reducing the current density at the joint of the tuning screw 200 and the cover plate. The specific structure and formation of the tuning screw 200 are discussed in the context and will not be described in detail herein.
The invention also provides communication equipment which comprises the cavity filter, wherein the cavity filter is arranged on the signal transceiving circuit part of the communication equipment and used for selecting signals.
Referring to fig. 2 and 3, fig. 3 is a simplified flow chart of a tuning screw manufacturing method according to a preferred embodiment of the present invention.
As shown in fig. 3, the present invention further provides a method for manufacturing a tuning screw 200, comprising the following steps:
s1: a section of metal bar stock is machined into screw section 210.
In this step, the method further comprises the steps of: the second end 212 of the screw section 210 is machined with a helical mating structure 214, wherein the helical mating structure 214 is a recessed hexagonal, straight, or cross-shaped groove, or the like.
S2: a section of metal bar stock is machined to form a tuning section 220, wherein the tuning section 220 is located at the first end 211 of the screw section 210.
In this step, the method further comprises the steps of: the outer end of the tuning section 220 is machined to be bulb-shaped with a smooth wall.
S3: an insulating layer 222 is provided on the outer surface of the tuning section 220.
In this step, the method further comprises the steps of: spraying polytetrafluoroethylene on the outer surface of the tuning section 220; or an insulating sleeve may be provided over the outer surface of tuning section 220.
Wherein, the step of spraying polytetrafluoroethylene on the outer surface of the tuning section 220 further comprises: a masking step is performed on the outer surface of the screw section 210, wherein the masking layer insulation 222 may be spaced one to two flights apart.
In summary, it is easily understood by those skilled in the art that the tuning screw 200 provided by the present invention has the insulating layer 222, so that the field strength on the tuning screw 200 can be reduced, the current density at the joint of the tuning screw 200 and the inner surface of the cover plate can be reduced, the influence of the tuning screw 200 on intermodulation can be greatly reduced under the condition of ensuring the frequency adjustment, the intermodulation first pass rate of mass-produced products can be improved, the maintenance cost of the products can be reduced, and the performance of the whole products can be improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (20)
- A tuning screw, comprising:a screw section;a tuning section connected to a first end of the screw section;wherein an outer surface of the tuning section has an insulating layer.
- The tuning screw of claim 1, wherein the insulating layer is a polytetrafluoroethylene layer that is laminated to an outer surface of the tuning section.
- The tuning screw of claim 1, wherein the insulating layer is an insulating sleeve disposed on an outer surface of the tuning section.
- The tuning screw of claim 1, wherein the outer surface of the tuning section has smooth walls.
- The tuning screw of claim 4, wherein the outer end of the tuning section is bulbous.
- The tuning screw of claim 1, wherein the second end of the screw section is provided with a helical engagement, the helical engagement being a recessed hexagonal groove, a straight groove, or a cross groove.
- The tuning screw of claim 2, wherein the polytetrafluoroethylene layer has a thickness of 0.2-0.25 mm.
- A cavity filter, comprising:a cavity;the cover plate covers the cavity to form a resonant cavity;the tuning screw penetrates through the cover plate and is inserted into the resonant cavity;the tuning screw comprises a screw section and a tuning section connected to the first end of the screw section, the screw section is locked with the cover plate, the outer surface of the tuning section is provided with an insulating layer, and the insulating layer is used for reducing the current density at the joint of the tuning screw and the cover plate.
- The cavity filter of claim 8, wherein the insulating layer is a teflon layer, and the teflon layer is compounded on an outer surface of the tuning section.
- The cavity filter of claim 8, wherein the insulating layer is an insulating sleeve disposed over an outer surface of the tuning section.
- The cavity filter of claim 8, wherein an outer surface of the tuning section has smooth walls.
- The cavity filter of claim 11, wherein the outer end of the tuning section is bulbous.
- The cavity filter of claim 8, wherein the second end of the screw section is provided with a helical engagement structure that is a recessed hexagonal groove, a straight groove, or a cross groove.
- The cavity filter of claim 9, wherein the polytetrafluoroethylene layer has a thickness of 0.2-0.25 mm.
- A communication device comprising the cavity filter according to any one of claims 8 to 14, wherein the cavity filter is provided in a signal transceiver circuit portion of the communication device for selecting a signal.
- The manufacturing method of the tuning screw is characterized by comprising the following steps of:processing a section of the metal bar into a screw section;machining a section of a metal bar stock into a tuning section, wherein the tuning section is located at a first end of the screw section;and arranging an insulating layer on the outer surface of the tuning section.
- The method of claim 16, wherein the step of machining a section of the metal bar stock into a tuning section comprises:and processing the outer end of the tuning section into a ball head shape with a smooth wall.
- The method of making a tuning screw of claim 16, wherein the step of machining a section of metal bar stock into a screw section comprises:and processing a spiral matching structure at the second end of the screw section, wherein the spiral matching structure is a concave inner hexagon, a straight groove or a cross groove.
- The method of claim 16, wherein said step of providing an insulating layer on an outer surface of said tuning section comprises:spraying polytetrafluoroethylene on the outer surface of the tuning section; orAnd sleeving an insulating sleeve on the outer surface of the tuning section.
- The method of claim 19, wherein the step of spraying polytetrafluoroethylene on the outer surface of the tuning section further comprises:shielding an outer surface of the screw section, wherein the shielding surface is spaced from the insulating layer by one to two turns of threads.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/095960 WO2016106707A1 (en) | 2014-12-31 | 2014-12-31 | Tuning screw and manufacturing method therefor, cavity filter, and communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107112614A true CN107112614A (en) | 2017-08-29 |
Family
ID=56283980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480084199.9A Pending CN107112614A (en) | 2014-12-31 | 2014-12-31 | Tuning screw and its manufacture method, cavity body filter, communication equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107112614A (en) |
| WO (1) | WO2016106707A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115295986A (en) * | 2022-08-09 | 2022-11-04 | 深圳国人科技股份有限公司 | Adjustable filter |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201511325D0 (en) * | 2015-06-29 | 2015-08-12 | Radio Design Ltd | Filter apparatus and method of use thereof |
| WO2019127496A1 (en) | 2017-12-29 | 2019-07-04 | 华为技术有限公司 | Cavity filter |
| CN110600844A (en) * | 2019-09-26 | 2019-12-20 | 东莞市华尔通信有限责任公司 | Press-riveting nut and filter thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1169748A1 (en) * | 1999-04-14 | 2002-01-09 | Telefonaktiebolaget Lm Ericsson | A tuning arrangement |
| CN101964436A (en) * | 2009-07-23 | 2011-02-02 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN102354778A (en) * | 2011-08-24 | 2012-02-15 | 京信通信系统（中国）有限公司 | Elliptic function low-path filtering path and communication cavity device adopting same |
| CN203277600U (en) * | 2013-05-09 | 2013-11-06 | 中兴通讯股份有限公司 | A dielectric filtering apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103682536B (en) * | 2012-09-13 | 2015-12-23 | 深圳市大富科技股份有限公司 | A kind of cavity body filter, tuning screw and Self-locking screw |
| CN203300776U (en) * | 2013-05-06 | 2013-11-20 | 京信通信技术(广州)有限公司 | Communication cavity device and low-pass filtering path |
| CN103474726B (en) * | 2013-08-23 | 2016-04-06 | 京信通信系统（中国）有限公司 | Elliptic Function Type low pass filter |
| CN204538161U (en) * | 2014-12-31 | 2015-08-05 | 深圳市大富科技股份有限公司 | Tuning screw, cavity body filter, communication equipment |
-
2014
- 2014-12-31 WO PCT/CN2014/095960 patent/WO2016106707A1/en active Application Filing
- 2014-12-31 CN CN201480084199.9A patent/CN107112614A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1169748A1 (en) * | 1999-04-14 | 2002-01-09 | Telefonaktiebolaget Lm Ericsson | A tuning arrangement |
| CN101964436A (en) * | 2009-07-23 | 2011-02-02 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN102354778A (en) * | 2011-08-24 | 2012-02-15 | 京信通信系统（中国）有限公司 | Elliptic function low-path filtering path and communication cavity device adopting same |
| CN203277600U (en) * | 2013-05-09 | 2013-11-06 | 中兴通讯股份有限公司 | A dielectric filtering apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016106707A1 (en) | 2016-07-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107112614A (en) | Tuning screw and its manufacture method, cavity body filter, communication equipment | |
| WO2014006150A1 (en) | Waveguide coupling, high-frequency module, filling level radar, and use | |
| CN102760923B (en) | Medium filter | |
| KR101720261B1 (en) | Tunable high frequency filter | |
| KR101307107B1 (en) | Dielectric Resonator Filter | |
| EP3064764A1 (en) | Microwave ignition plug for coupling microwave energy | |
| US9935348B2 (en) | TM dielectric resonator, method for implementing TM dielectric resonator and TM dielectric filter | |
| MX2018004133A (en) | Mini isolator. | |
| US20180034124A1 (en) | Waveguide Gasket | |
| CN107800008B (en) | Coaxial connector, filter and radio frequency device | |
| CN204538161U (en) | Tuning screw, cavity body filter, communication equipment | |
| US20120274412A1 (en) | Removable collar for matching high frequency impedance and high frequency cable television using the same | |
| US10917066B2 (en) | Input/output apparatus of multiplexer, and multiplexer | |
| DE102014117315A1 (en) | Device for transmitting signals from a housing opening of a metallic housing | |
| CN106356603B (en) | Broadband probe coaxial coupler | |
| CN102856717B (en) | Radiofrequency coaxial connector with vacuum sealing function | |
| EA202290113A1 (en) | VEHICLE GLAZING WITH ANTENNA | |
| CN207625034U (en) | Coaxial connector and filter, radio-frequency devices | |
| CN107004934A (en) | Cavity body filter, connector, duplexer and radio frequency remote equipment | |
| CN203707299U (en) | Cavity filter | |
| CN203250841U (en) | Miniaturized converter from end fed type coaxial line to circular waveguide | |
| US9627740B2 (en) | RF notch filters and related methods | |
| WO2017101891A3 (en) | Spring-type terminal | |
| US20160248138A1 (en) | Waveguide coaxial conversion device and transmission/reception integrated splitter | |
| CN202651329U (en) | Miniaturized broadband orthogonal type waveguide coaxial converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170829 |
|
| RJ01 | Rejection of invention patent application after publication |