CN105304989B - A kind of cavity body filter - Google Patents
A kind of cavity body filter Download PDFInfo
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- CN105304989B CN105304989B CN201510792866.5A CN201510792866A CN105304989B CN 105304989 B CN105304989 B CN 105304989B CN 201510792866 A CN201510792866 A CN 201510792866A CN 105304989 B CN105304989 B CN 105304989B
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Abstract
A kind of cavity body filter, including cavity, cover board and tuning Self-locking screw, the cover board is used to cover the cavity of cavity body filter, cover board includes cover board body, cover board body uses albronze, the cover board body is equipped with tuning threaded hole, tuning threaded hole be specially extend to cavity direction with the integrally formed boss of cover board body, tuning Self-locking screw is divided into head and bar portion, Self-locking screw is made using copper, screw one end is head, the other end is bar portion, the head of screw is equipped with screw thread and forms screw, the screw thread is equipped with two sets, the diameter L and pitch P of upper and lower two external threading are identical, section diameter between two screw threads is 40%-the 70% of gauge diameter, the filter that the present invention designs takes into account cost and tuning performance.
Description
Technical field
The present invention relates to field of signal processing more particularly to a kind of cavity body filters.
Background technology
Currently, the signal processing of cavity body filter is usually completed by the tuning Self-locking screw on filter cover board, generally
For tuning screw handle the problem of be signal intermodulation the problem of, in particular to two different frequency signals, in a certain system
The signal of the new frequency of superposition and generation.
Current common filter includes the components such as cavity, cover board and tuning Self-locking screw, and filter cover board is now mostly
Tuned window is processed by the way of the punching press pore-forming on plank, on the one hand processes threaded hole defect rate with the mode of punching press
Height, too high manufacturing cost, the tuned window on the other hand stamped out also need additionally mounted upper tuning swivel nut, and tuning swivel nut is using weldering
Connect, press, the modes such as gluing are fixed on tuned window, the installation for tuning swivel nut not only needs cost of labor and processing cost, together
When, this tuning swivel nut in addition installed additional on tuned window is simultaneously unstable, is easy for generating loosening after a period of time, and
The interface also simultaneously out-of-flatness of tuned window and tuning swivel nut, finally influences actual tuning effect.
Invention content
The present invention is intended to provide a kind of cavity body filter.
In order to solve the above technical problems, the present invention uses following technical scheme, a kind of cavity body filter, including cavity, lid
Plate and tuning Self-locking screw, the cover board are used to cover the cavity of cavity body filter, and cover board includes cover board body, and cover board body is adopted
With albronze, which is Copper-Aluminum compound one alloy, i.e. one side is copper, is on one side aluminium, and aluminium faces quasi- cavity when use,
The cover board body be equipped with tuning threaded hole, tuning threaded hole be specially extends to cavity direction with cover board body integrally at
The middle section of the boss of type, boss is hollow, and the inner ring of boss is copper, outer ring is aluminium, is equipped with along its axis direction inside boss
Threaded hole is additionally provided with the tuned window to connect with threaded hole inside the boss along its axis direction, and the tuned window is relative to screw thread
Closer to the cavity of filter, the diameter of tuned window is less than the diameter of filter tuner Self-locking screw in hole；Tune Self-locking screw point
For head and bar portion, Self-locking screw is made using copper, and screw one end is head, and the other end is bar portion, and bar portion stretches into filtering
Self-locking screw is fixed on the cover board of filter by tuned radio frequency parameter, head in the cavity of device, and apical head is equipped with for connecing
Receive screwdriver and according to the driving of the screwdriver make tuning screw screw in cavity body filter inside receiving channel, the head of screw is set
There is screw thread to form screw, which is equipped with two sections, and the diameter >=M4 for the screw that screw thread is formed between two sections of screw threads and is not attached to,
The diameter L and pitch P of two sections screw thread are identical, and upper screw thread will produce a displacement in the axial direction with lower screw thread,
Displacement S is set as the deviation that screw thread originally extended downwardly location and practical lower screw position generates, institute's rheme
The size of shifting amount S is 0.1P -0.8P, and the section diameter between two screw threads is 40%-the 70% of gauge diameter.
Preferably, the thickness of the cover board body is 1-3mm.
Preferably, the height of the boss is 1-20mm.
Preferably, the swivel nut that the boss internal thread holes are formed is applicable in the tuning Self-locking screw of M4-M10 specifications.
Preferably, including the copper of 10-20% in the albronze that the cover board body uses, residual components are aluminium.
Preferably, including 10% copper and 90% aluminium in the albronze that the cover board body uses.
Preferably, being additionally provided with cover screw hole on the cover board body, cover board passes through the screw across cover screw hole
It is fixed on cavity.
Preferably, finish≤0.8 for the copper that Self-locking screw uses, the copper material for making Self-locking screw is H65.
Preferably, the spacing between described two screw threads is 0.1-2mm.
Preferably, receiving channel is interior hexagonal, screw head is evenly distributed with six bar grooves around the part of receiving channel and prolongs
It extends to inside receiving channel.
Relative to traditional cavity body filter, the present invention is all used as the material of cover board body, city using albronze
Common filter cover board mostly uses the plank of electroplating surface copper or fine copper on field, regardless of be fine copper or electro-coppering at
This is all relatively high, is on the one hand to manufacture cover board using aluminium because the aluminium of accounting majority is relatively cheap using albronze
Material cost can greatly be saved, the quality of another aspect aluminium and copper is softer, and it is easy that processing is got up, and also saves and is processed into
Originally, the considerations of while for electric conductivity good using copper, albronze can also play and fine copper plate while saving cost
The same conductive effect of material because the present invention cover board be also provided with tuning threaded hole extend to cavity direction with cover board sheet
The hollow boss in the middle section of body by integral forming, the inner ring of boss is copper, outer ring is aluminium, is contacted with adjusting screw inside boss
Part be copper, do not interfere with actual conductive effect；And the present invention replaces traditional tuned window and tuning spiral shell using boss
The combination of set is that need to only be stretched to cover board body because processing boss, tuning can be automatically performed using lathe
The processing of threaded hole, without still further by stamping out tuned window and fixed tuning two sets of processes of swivel nut, which is
It is processed by the material of cover board body, the present invention will not also waste material while saving process, and be integrally formed
Boss it is very firm, do not interfere with the effect of tuning；In view of the actual demand of present filter tuning, Self-locking screw is tuned
Specification be M4-M10 at present, and accordingly, since the albronze extensibility that cover board uses is preferable, the thickness of cover board only needs to control
In 1-3mm, cover board is light and does not influence using effect, further saves material cost, and the height of boss can also be controlled
System is in 1-20mm, it is sufficient to meet the requirement of Self-locking screw；It is additionally provided with along its axis direction inside boss of the present invention and screw thread
The tuned window that hole connects, for the tuned window relative to threaded hole closer to the cavity of filter, the diameter of tuned window is less than filter
The diameter for tuning Self-locking screw, capacitance is formed between the inner wall and tuning screw of boss inner ring so that is able to introduce on cover board flat
The effect of plate capacitance reduces the current density of tuning screw and cover board binding site, reduces and is contacted not with cover board because of tuning screw
The inter-modulated signal level of good generation, improves the intermodulation first-pass yield of cavity body filter, and the front end of screw is detached from downwards threaded hole entrance
Tuned window can be squeezed when tuning porose area, and tunes bore dia and is less than threaded hole, it is contemplated that the material of tuned window is copper, and copper is good
Elastic force can promote tuned window inwardly to squeeze preferably to lock Self-locking screw, and filter cover board also has no need to install an elasticity
Sheet metal saves material and artificial；A kind of new tuning Self-locking screw has also been devised in the present invention, and the head of screw is equipped with screw thread
Screw is formed, which is equipped with two sections, and according to the tuning range of cavity body filter and actual use demand, screw thread of the present invention is formed
Screw diameter >=M4, the height of corresponding screw controls in 1-20mm, and of the invention two sections of screw threads are simultaneously not attached to, by
Screw is made using copper in the present invention, copper itself has good electric conductivity and ductility, and two spiral shells that the present invention designs
The diameter L and pitch P of line are identical, and upper screw thread will produce a displacement in the axial direction with lower screw thread, and displacement S is set
It is set to the deviation that screw thread originally extended downwardly location and practical lower screw position generates, the size of the displacement S
For 0.1P -0.8P, due to the presence of the offset, during screwdriver drives screw to screw in cavity body filter screw head by
To power be just no longer uniformly distributed, since two screw threads form a slight dislocation, such screwdriver driving screw screws in chamber
Screw head will produce slight deformation during fluid filter inside, because the power that screw head is subject to not is uniformly to divide
Cloth, certain deviation is had, and the screw thread of two dislocation can be between two screw threads after the extruding force by screwdriver
The restoring force that the original shape of recovery is generated centered on part resists the cavity of filter, to complete the self-locking of screw, meanwhile, it examines
Consider actual self-locking effect, the section diameter between screw thread is 40%-the 70% of gauge diameter, because of this section diameter mistake
Have the danger of fracture when narrow, while the restoring force of two screw threads has a counteracting to a certain extent, and this section diameter mistake
The extruding force and inadequate, self-locking effect unobvious that two screw threads generate when wide, in addition, the copper material that the present invention is used for manufacturing screw is
H65, neither too hard, nor too soft, copper content can also meet the needs of tuning, and copper material finish≤0.8 ensures screw surface and filtering
The friction coefficient of device cover board, it is ensured that self-locking effect, while not interfering with the effect of tuning again, it is contemplated that the height of screw and straight
Diameter, the spacing control between two screw threads is in 0.1-2mm, and the receiving channel of screw head is interior hexagonal, screw head
Six bar grooves are evenly distributed with around the part of receiving channel to extend to inside receiving channel, this shape is more convenient the top deformation of screw
To obtain better self-locking effect.
Description of the drawings
Fig. 1 is the schematic diagram that the present invention is embodiment；
Fig. 2 is the schematic diagram of cover board of the present invention；
Fig. 3 is the schematic diagram of present invention tuning threaded hole；
Fig. 4 is the structural schematic diagram of present invention tuning Self-locking screw;
Fig. 5 is the partial enlarged view of present invention tuning Self-locking screw；
Fig. 6 is the sectional view of present invention tuning Self-locking screw.
In figure：1, cover board body；2, boss；3, threaded hole；4, tuned window；5, cover screw hole；6, head；7, bar portion；
8, receiving channel；9, screw thread；91, upper screw thread；92, lower screw thread；10, cavity；11, Self-locking screw.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, can also be the connection inside two elements, it can
It, can also be indirectly connected through an intermediary to be to be connected directly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
A kind of cavity body filter according to the ... of the embodiment of the present invention, including cavity 10, cover board are described referring to Fig. 1 to Fig. 6
With tuning Self-locking screw 11, the cover board is used to cover the cavity 10 of cavity body filter, and cover board includes cover board body 1, cover board sheet
It is Copper-Aluminum compound one alloy that body 1, which uses albronze, the alloy, i.e. one side is copper, is on one side aluminium, and aluminium is in face of standard when use
Cavity 10, the cover board body 1 be equipped with tuning threaded hole, tuning threaded hole be specially extend to cavity direction with cover board sheet
The boss 2 of body by integral forming, the middle section of boss 2 is hollow, and the inner ring of boss 2 is copper, outer ring is aluminium, along it inside boss 2
Axis direction is equipped with threaded hole 3, and the tuned window 4 to connect with threaded hole 3 is additionally provided with along its axis direction inside the boss 2, should
For tuned window 4 relative to threaded hole 3 closer to the cavity 10 of filter, the diameter of tuned window 4 is less than filter tuner Self-locking screw
11 diameter；Tuning Self-locking screw 11 divides for head 6 and bar portion 7, and Self-locking screw 11 is made using copper, and 11 one end of screw is
Head 6, the other end are bar portion 7, and bar portion 7 stretches into tuned radio frequency parameter in the cavity 10 of filter, and Self-locking screw 11 is consolidated on head 6
It is scheduled on the cover board of filter, 6 top of head is equipped with for receiving screwdriver and making tuning screw according to the driving of the screwdriver
11 screw in the receiving channel 8 inside cavity body filter, and the head 6 of screw is equipped with screw thread 9 and forms screw, which is equipped with two sections, spiral shell
Diameter >=the M4 for the screw that line 9 is formed between two sections of screw threads 9 and is not attached to, diameter L and pitch P phases of two sections screw thread 9
Together, upper screw thread 91 will produce a displacement in the axial direction with lower screw thread 92, and it is original that displacement S is set as screw thread 91
The deviation that location and practical lower 92 position of screw thread generate is extended downwardly, the size of the displacement S is 0.1P -0.8P,
Section diameter between two screw threads 9 is 40%-the 70% of gauge diameter.
Preferably, the thickness of the cover board body 1 is 1-3mm.
Preferably, the height of the boss 2 is 1-20mm.
Preferably, the swivel nut that 2 internal thread holes 3 of the boss are formed is applicable in the tuning Self-locking screw of M4-M10 specifications.
Preferably, including the copper of 10-20% in the albronze that the cover board body 1 uses, residual components are aluminium.
Preferably, including 10% copper and 90% aluminium in the albronze that the cover board body 1 uses.
Preferably, being additionally provided with cover screw hole 5 on the cover board body 1, cover board passes through the spiral shell across cover screw hole
Nail is fixed on cavity.
Preferably, finish≤0.8 for the copper that Self-locking screw 11 uses, the copper material for making Self-locking screw 11 is H65.
Preferably, the spacing between described two screw threads 9 is 0.1-2mm.
Preferably, receiving channel 8 is interior hexagonal, 11 top ring of screw is evenly distributed with six around the part of receiving channel 8
Slot extends to inside receiving channel 8.
Relative to traditional cavity body filter, the present invention is all used as the material of cover board body, city using albronze
Common filter cover board mostly uses the plank of electroplating surface copper or fine copper on field, regardless of be fine copper or electro-coppering at
This is all relatively high, is on the one hand to manufacture cover board using aluminium because the aluminium of accounting majority is relatively cheap using albronze
Material cost can greatly be saved, the quality of another aspect aluminium and copper is softer, and it is easy that processing is got up, and also saves and is processed into
Originally, the considerations of while for electric conductivity good using copper, albronze can also play and fine copper plate while saving cost
The same conductive effect of material because the present invention cover board be also provided with tuning threaded hole extend to cavity direction with cover board sheet
The hollow boss in the middle section of body by integral forming, the inner ring of boss is copper, outer ring is aluminium, is contacted with adjusting screw inside boss
Part be copper, do not interfere with actual conductive effect；And the present invention replaces traditional tuned window and tuning spiral shell using boss
The combination of set is that need to only be stretched to cover board body because processing boss, tuning can be automatically performed using lathe
The processing of threaded hole, without still further by stamping out tuned window and fixed tuning two sets of processes of swivel nut, which is
It is processed by the material of cover board body, the present invention will not also waste material while saving process, and be integrally formed
Boss it is very firm, do not interfere with the effect of tuning；In view of the actual demand of present filter tuning, Self-locking screw is tuned
Specification be M4-M10 at present, and accordingly, since the albronze extensibility that cover board uses is preferable, the thickness of cover board only needs to control
In 1-3mm, cover board is light and does not influence using effect, further saves material cost, and the height of boss can also be controlled
System is in 1-20mm, it is sufficient to meet the requirement of Self-locking screw；It is additionally provided with along its axis direction inside boss of the present invention and screw thread
The tuned window that hole connects, for the tuned window relative to threaded hole closer to the cavity of filter, the diameter of tuned window is less than filter
The diameter for tuning Self-locking screw, capacitance is formed between the inner wall and tuning screw of boss inner ring so that is able to introduce on cover board flat
The effect of plate capacitance reduces the current density of tuning screw and cover board binding site, reduces and is contacted not with cover board because of tuning screw
The inter-modulated signal level of good generation, improves the intermodulation first-pass yield of cavity body filter, and the front end of screw is detached from downwards threaded hole entrance
Tuned window can be squeezed when tuning porose area, and tunes bore dia and is less than threaded hole, it is contemplated that the material of tuned window is copper, and copper is good
Elastic force can promote tuned window inwardly to squeeze preferably to lock Self-locking screw, and filter cover board also has no need to install an elasticity
Sheet metal saves material and artificial；A kind of new tuning Self-locking screw has also been devised in the present invention, and the head of screw is equipped with screw thread
Screw is formed, which is equipped with two sections, and according to the tuning range of cavity body filter and actual use demand, screw thread of the present invention is formed
Screw diameter >=M4, the height of corresponding screw controls in 1-20mm, and of the invention two sections of screw threads are simultaneously not attached to, by
Screw is made using copper in the present invention, copper itself has good electric conductivity and ductility, and two spiral shells that the present invention designs
The diameter L and pitch P of line are identical, and upper screw thread will produce a displacement in the axial direction with lower screw thread, and displacement S is set
It is set to the deviation that screw thread originally extended downwardly location and practical lower screw position generates, the size of the displacement S
For 0.1P -0.8P, due to the presence of the offset, during screwdriver drives screw to screw in cavity body filter screw head by
To power be just no longer uniformly distributed, since two screw threads form a slight dislocation, such screwdriver driving screw screws in chamber
Screw head will produce slight deformation during fluid filter inside, because the power that screw head is subject to not is uniformly to divide
Cloth, certain deviation is had, and the screw thread of two dislocation can be between two screw threads after the extruding force by screwdriver
The restoring force that the original shape of recovery is generated centered on part resists the cavity of filter, to complete the self-locking of screw, meanwhile, it examines
Consider actual self-locking effect, the section diameter between screw thread is 40%-the 70% of gauge diameter, because of this section diameter mistake
Have the danger of fracture when narrow, while the restoring force of two screw threads has a counteracting to a certain extent, and this section diameter mistake
The extruding force and inadequate, self-locking effect unobvious that two screw threads generate when wide, in addition, the copper material that the present invention is used for manufacturing screw is
H65, neither too hard, nor too soft, copper content can also meet the needs of tuning, and copper material finish≤0.8 ensures screw surface and filtering
The friction coefficient of device cover board, it is ensured that self-locking effect, while not interfering with the effect of tuning again, it is contemplated that the height of screw and straight
Diameter, the spacing control between two screw threads is in 0.1-2mm, and the receiving channel of screw head is interior hexagonal, screw head
Six bar grooves are evenly distributed with around the part of receiving channel to extend to inside receiving channel, this shape is more convenient the top deformation of screw
To obtain better self-locking effect.
In the description of this specification, the description meaning of reference term " one embodiment ", " example " or " some examples " etc.
Refer at least one reality that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained in the present invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or show
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples
It can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (9)
1. a kind of cavity body filter, including cavity, cover board and tuning Self-locking screw, the cover board is for covering cavity body filter
Cavity, cover board include cover board body, which is characterized in that it is Copper-Aluminum compound integration that cover board body, which uses albronze, the alloy,
Alloy, i.e. one side are copper, are on one side aluminium, and aluminium faces quasi- cavity when use, and the cover board body is equipped with tuning threaded hole, tuning
Threaded hole be specially extend to cavity direction with the integrally formed boss of cover board body, the middle section of boss is hollow, boss
Inner ring be copper, outer ring is aluminium, be equipped with threaded hole along its axis direction inside boss, inside the boss also along its axis direction
Equipped with the tuned window to connect with threaded hole, the tuned window is relative to threaded hole closer to the cavity of filter, the diameter of tuned window
Less than the diameter of filter tuner Self-locking screw；Tuning Self-locking screw is divided into head and bar portion, Self-locking screw made using copper and
At the copper material for making Self-locking screw is H65, and finish≤0.8 of copper, screw one end is head, and the other end is bar portion, and bar portion is stretched
Enter tuned radio frequency parameter in the cavity of filter, Self-locking screw is fixed on the cover board of filter by head, and apical head is equipped with
For receiving screwdriver and so that tuning screw is screwed in the receiving channel inside cavity body filter according to the driving of the screwdriver, screw
Head is equipped with screw thread and forms screw, which is equipped with two sets, diameter >=M4 of the screw of screw thread formation, between two external threadings not
It is connected, the diameter L and pitch P of upper and lower two external threading are identical, and upper screw thread will produce a position in the axial direction with lower screw thread
Shifting amount, displacement S are set as the deviation that screw thread originally extended downwardly location and practical lower screw position generates, institute
The size for stating displacement S is 0.1P -0.8P, and the section diameter between two screw threads is 40%-the 70% of gauge diameter.
2. cavity body filter according to claim 1, which is characterized in that the thickness of the cover board body is 1-3mm.
3. cavity body filter according to claim 1, which is characterized in that the height of the boss is 1-20mm.
4. cavity body filter according to claim 2 or 3, which is characterized in that the spiral shell that the boss internal thread holes are formed
Set is applicable in the tuning Self-locking screw of M4-M10 specifications.
5. cavity body filter according to claim 1, which is characterized in that wrapped in the albronze that the cover board body uses
Copper containing 10-20%, residual components are aluminium.
6. cavity body filter according to claim 1 or 5, which is characterized in that the albronze that the cover board body uses
In include 10% copper and 90% aluminium.
7. cavity body filter according to claim 1, which is characterized in that be additionally provided with cover screw on the cover board body
Hole, cover board are fixed on by the screw across cover screw hole on cavity.
8. cavity body filter according to claim 1, which is characterized in that the spacing between two screw threads of Self-locking screw is
0.1-2mm。
9. cavity body filter according to claim 1, which is characterized in that the receiving channel of Self-locking screw is interior hexagonal, spiral shell
Screw top portion is evenly distributed with six bar grooves around the part of receiving channel and extends to inside receiving channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510792866.5A CN105304989B (en) | 2015-11-18 | 2015-11-18 | A kind of cavity body filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510792866.5A CN105304989B (en) | 2015-11-18 | 2015-11-18 | A kind of cavity body filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105304989A CN105304989A (en) | 2016-02-03 |
| CN105304989B true CN105304989B (en) | 2018-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510792866.5A Active CN105304989B (en) | 2015-11-18 | 2015-11-18 | A kind of cavity body filter |
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| Country | Link |
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| CN (1) | CN105304989B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216436091U (en) * | 2019-12-31 | 2022-05-03 | 大富科技(安徽)股份有限公司 | Cavity filter and communication equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435579A (en) * | 2002-02-01 | 2003-08-13 | 名川政人 | Fastener structure, bolt and nut with said structure and making method thereof |
| CN201655936U (en) * | 2010-04-12 | 2010-11-24 | 深圳市大富科技股份有限公司 | Cover plate of cavity filter and cavity filter |
| CN204156069U (en) * | 2014-11-24 | 2015-02-11 | 深圳市欣天科技股份有限公司 | A kind of cavity body filter |
| CN205335400U (en) * | 2015-11-18 | 2016-06-22 | 强胜精密机械(苏州)有限公司 | Cavity filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101277824B1 (en) * | 2012-03-22 | 2013-06-21 | 주식회사 에이스테크놀로지 | Waveguide filter |
-
2015
- 2015-11-18 CN CN201510792866.5A patent/CN105304989B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435579A (en) * | 2002-02-01 | 2003-08-13 | 名川政人 | Fastener structure, bolt and nut with said structure and making method thereof |
| CN201655936U (en) * | 2010-04-12 | 2010-11-24 | 深圳市大富科技股份有限公司 | Cover plate of cavity filter and cavity filter |
| CN204156069U (en) * | 2014-11-24 | 2015-02-11 | 深圳市欣天科技股份有限公司 | A kind of cavity body filter |
| CN205335400U (en) * | 2015-11-18 | 2016-06-22 | 强胜精密机械(苏州)有限公司 | Cavity filter |
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| Publication number | Publication date |
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| CN105304989A (en) | 2016-02-03 |
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