CN205452495U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
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- CN205452495U CN205452495U CN201521133938.7U CN201521133938U CN205452495U CN 205452495 U CN205452495 U CN 205452495U CN 201521133938 U CN201521133938 U CN 201521133938U CN 205452495 U CN205452495 U CN 205452495U
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- cavity
- cover plate
- cavity body
- body filter
- thread bush
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Abstract
The utility model discloses a cavity filter, include: the cavity, opening of cavity, the apron for the sealed cavity body, the apron is including the apron main part and fix the thread bush in the apron main part, is provided with the screw hole in the thread bush, tuning screw rod, with screw hole threaded connection, the screw hole includes smooth wall anodontia district that is close to the cavity and the internal thread district that keeps away from the cavity, the material hardness of thread bush is greater than the apron main part. The utility model discloses the passive intermodulation that can reduce the production between tuning screw rod and the apron disturbs.
Description
Technical field
This utility model relates to filter field, particularly relates to a kind of cavity body filter.
Background technology
When two or more signals mix in having non-linear passive device (such as duplexer, adapter), passive intermodulation product will be produced.Under multi-frequency environment, the number of intermodulation product sharply increases with transmission channel number and the increase of passive intermodulation (English name: PassiveInterModulation, english abbreviation: PIM) product exponent number.The generation that in communication system, PIM (passive intermodulation) disturbs, substantially from two kinds of Passive Nonlinear: contact nonlinear and material nonlinearity.Wherein contact nonlinear is the main cause producing intermodulation, and compares and be difficult to resolve certainly.
In passive cavity filter, contact nonlinear the PIM caused specifically includes that 1) the loosening and slide and oxide layer and the existence of pollutant of metal contact；2) mechanical effect that the point cantact that on composition surface, non-360 degree engages causes；3) unlike material device contacts causes.
Current cavity body filter, its tuning screw and cover plate are to be threaded connection, and the screw thread on cover plate is by the direct tapping of screw tap.Because screw thread is helical form, Gu adjusting screw rod contacts in the non-linear of a kind of gradual change of cover plate screw tip.Tuning screw and cover plate binding site are highest current density in whole resonator cavity, ultimately result in tuning screw and produce the strongest intermodulation source with cover plate resonance face bound fraction, produce the strongest passive intermodulation interference.
Accordingly, it is desirable to provide a kind of cavity body filter, to solve above-mentioned technical problem.
Utility model content
This utility model is mainly solving the technical problems that provide a kind of cavity body filter, it is possible to reduce the passive intermodulation interference of cavity body filter.
For solving above-mentioned technical problem, the technical scheme that this utility model uses is: providing a kind of cavity body filter, this cavity body filter includes: cavity, one opening of cavity；Cover plate, is used for covering cavity, and cover plate includes cover plate main body and is fixed on the thread bush of cover plate main body, is provided with screwed hole in thread bush；Tuning screw, threadeds with screwed hole, and screwed hole includes the smooth wall anodontia district near cavity and the internal threaded regions away from cavity, and the material hardness of thread bush is more than the material hardness of cover plate main body.
Wherein, on internal threaded regions the tooth of screw thread away from less than or equal to 0.35mm.
Wherein, on internal threaded regions the tooth of screw thread away from equal to 0.35mm.
Wherein, cover plate includes cover plate main body and is fixed on the thread bush of cover plate main body, and screwed hole is formed on thread bush, and the material hardness of thread bush is more than the material hardness of cover plate main body.
Wherein, the material of thread bush is copper, and the material of cover plate main body is aluminum.
Wherein, the whole surface of tuning screw is external screw thread.
Wherein, thread bush flushes near the surface of cavity with cover plate near one end of cavity, and thread bush flushes away from the surface of cavity with cover plate away from one end of cavity.
Wherein, tuning screw includes along its length and successively along the first paragraph arranged near cavity direction and second segment, the outer surface of first paragraph is provided with external screw thread, second segment smooth surface, the external diameter of second segment is less than the external diameter of first paragraph, and it is protruding that anodontia district is provided with a circle near one end of cavity.
Wherein, thread bush flushes near the surface of cavity with cover plate near one end of cavity, and thread bush exceeds the cover plate surface away from cavity away from one end of cavity.
Wherein, cavity body filter also includes that fixed cover is located at tuning screw top nut.
Wherein, cavity body filter also includes the packing ring being set on tuning screw and between nut and cover plate.
Wherein, cavity includes that bottom surface is fixed in bottom surface and be perpendicular to the sidewall of bottom surface, resonant rod and resonant rod has towards tuning screw and internal diameter more than the upper shed of the external diameter of tuning screw.
Wherein, bottom surface has boss, and resonant rod has the under shed towards bottom surface, and under shed is set on boss, and tuning plug is fixed with boss by screw.
Wherein, upper shed is cylindrical, and with tuning screw concentric.
Wherein, meeting: 0 < D1-D2 < 0.5mm between anodontia district and internal threaded regions, wherein, D1 is the internal diameter in anodontia district, and D2 is the internal diameter of internal threaded regions.
The beneficial effects of the utility model are: be different from the situation of prior art, this utility model includes the smooth wall anodontia district corresponding with forceful electric power place and the internal threaded regions corresponding with weak electric field area by being set to by the screwed hole on cover plate, the passive intermodulation interference produced because there is the contact of gradual change type non linear metal in the forceful electric power place of current sense when tuning screw contacts rotate regulation with screwed hole can be eliminated, thus improve the intermodulation first-pass yield of cavity body filter product.
Accompanying drawing explanation
Fig. 1 is the structural representation of the cavity body filter of this utility model first embodiment；
Fig. 2 is the structural representation of the cavity body filter of this utility model the second embodiment.
Detailed description of the invention
With embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
Refer to the structural representation that Fig. 1, Fig. 1 are the cavity body filters of this utility model first embodiment.In the present embodiment, cavity body filter includes the cavity 10 of an opening, the cover plate 11 of capping cavity 10 and the tuning screw 14 threadeded with the screwed hole 13 being arranged on cover plate 11.
Cover plate 11 includes cover plate main body 111 and is fixed on the thread bush 112 of cover plate main body 111, and screwed hole 13 is formed on thread bush 112, and the material hardness of thread bush 112 is more than the material hardness of cover plate main body 111.On the thread bush 112 of hard material, the relatively stable intensity of closely-pitched of tapping is higher so that the intensity of screwed hole 13 is higher, on screw thread be hardly damaged.It is further preferable that the material of thread bush 112 is copper, the material of cover plate main body 111 is aluminum.Certainly, in other embodiments, cover plate main body 111 and thread bush 112 can also be other material.
Preferably, cavity body filter also includes the resonant rod 12 being fixed within cavity 10.In other embodiments, cavity body filter can not also include resonant rod 12.
Screwed hole 13 includes the smooth anodontia district 131 near cavity 10 and the internal threaded regions 132 away from cavity, preferably, when cavity body filter works, being formed on cover plate 11 along its thickness direction and along the weak electric field area being sequentially distributed near cavity 10 direction and forceful electric power place, screwed hole 13 includes the smooth wall anodontia district 131 corresponding with forceful electric power place and the internal threaded regions 132 corresponding with weak electric field area.Forceful electric power place and weak electric field area are formed by Kelvin effect, and highfield is distributed in cover plate 11 on a side surface of cavity 11 and resonant rod 12.The inwall in the anodontia district of screwed hole 13 is smooth, is not provided with thread.
Preferably, on internal threaded regions 132 tooth of screw thread away from less than or equal to 0.35mm, i.e. the tooth form that tuning screw 14 coordinates with cover plate 11 closely-pitched of short pitch.It is further preferable that the tooth of screw thread is away from equal to 0.35mm on internal threaded regions 132.As M5 screw rod select the tooth of 0.35 away from, make both cooperations tightr, thus reduce the non-linear effects brought of spiral gradient.Certainly, in other embodiments, on internal threaded regions 132 tooth of screw thread away from can also be that the tooth of other closely-pitcheds is away from value.
Preferably, the whole surface of tuning screw 14 is external screw thread.Preferably, thread bush 112 flushes near the surface of cavity 10 with cover plate 11 near one end of cavity 10, thread bush 112 flushes away from the surface of cavity 10 with cover plate 11 away from one end of cavity 10, i.e., as shown in Figure 1, the upper surface of thread bush 112 and the upper surface flush of cover plate 11, the lower surface of thread bush 112 flushes with the lower surface with cover plate 11.Certainly, in other embodiments, thread bush 112 can not also flush near the surface of cavity 10 with cover plate 11 near one end of cavity 10, and thread bush 112 can not also flush away from the surface of cavity 10 with cover plate 11 away from one end of cavity 10,
Preferably, cavity body filter also includes that fixed cover is located at tuning screw 14 top nut 15.
Preferably, cavity body filter also includes the packing ring 16 being set on tuning screw 14 and between nut 15 and cover plate 11.It is further preferable that packing ring 16 is between nut 15 and thread bush 112.
Preferably, cavity 10 includes bottom surface 101 and is perpendicular to the sidewall 102 of bottom surface 101, and resonant rod 12 is fixed on bottom surface 101 and resonant rod 12 has towards tuning screw 14 and internal diameter more than the upper shed 141 of the external diameter of tuning screw 14.
Preferably, bottom surface 101 has boss 1011, and resonant rod 12 has the under shed towards bottom surface, and under shed is set on boss 1011, and tuning plug 12 is fixed with boss 1011 by screw 17.
Preferably, upper shed 141 is cylindrical, and with tuning screw 14 concentric.
Preferably, meeting: 0 < D1-D2 < 0.5mm between anodontia district 131 and internal threaded regions 132, wherein, D1 is the internal diameter in anodontia district 131, and D2 is the internal diameter of internal threaded regions 132.Preferably, D1-D2=0.35mm.
Preferably, length H in anodontia district is 0.5mm, can also be other length values the most in other embodiments.
Refer to the structural representation that Fig. 2, Fig. 2 are the cavity body filters of this utility model the second embodiment.In the present embodiment, it is with the difference of this utility model first embodiment, tuning screw 24 includes along its length and successively along the first paragraph 241 arranged near cavity 20 direction and second segment 242, the outer surface of first paragraph 241 is provided with external screw thread, second segment 242 smooth surface, the external diameter of second segment 242 is less than the external diameter of first paragraph 241, and anodontia district 131 is provided with a circle projection 30 near one end of cavity 20.Thread bush 212 flushes near the surface of cavity 20 with cover plate 21 near one end of cavity 20, thread bush 212 exceeds the cover plate 21 surface away from cavity 20 away from one end of cavity 20, i.e. the upper surface of thread bush 212 is beyond the upper surface of cover plate 21, and the lower surface of thread bush 212 flushes with the lower surface of cover plate 21.
This utility model includes the smooth wall anodontia district corresponding with forceful electric power place and the internal threaded regions corresponding with weak electric field area by being set to by the screwed hole on cover plate, the passive intermodulation interference produced because there is the contact of gradual change type non linear metal in the forceful electric power place of current sense when tuning screw contacts rotate regulation with screwed hole can be eliminated, thus improve the intermodulation first-pass yield of cavity body filter product.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure utilizing this utility model description and accompanying drawing content to be made or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in scope of patent protection of the present utility model.
Claims (14)
1. a cavity body filter, it is characterised in that described cavity body filter includes:
Cavity, one opening of described cavity；
Cover plate, is used for covering described cavity, and described cover plate includes cover plate main body and is fixed on the thread bush of described cover plate main body, is provided with screwed hole in described thread bush；
Tuning screw, threadeds with described screwed hole, and described screwed hole includes the smooth wall anodontia district near described cavity and the internal threaded regions away from described cavity, and the material hardness of described thread bush is more than the material hardness of described cover plate main body.
Cavity body filter the most according to claim 1, it is characterised in that on described internal threaded regions, the tooth of screw thread is away from less than or equal to 0.35mm.
Cavity body filter the most according to claim 2, it is characterised in that on described internal threaded regions, the tooth of screw thread is away from equal to 0.35mm.
Cavity body filter the most according to claim 1, it is characterised in that the material of described thread bush is copper, the material of described cover plate main body is aluminum.
5. according to the cavity body filter described in any one of claim 1, it is characterised in that the whole surface of described tuning screw is external screw thread.
Cavity body filter the most according to claim 5, it is characterized in that, described thread bush flushes near the surface of described cavity with described cover plate near one end of described cavity, and described thread bush flushes away from the surface of described cavity with described cover plate away from one end of described cavity.
7. according to the cavity body filter described in any one of claim 1, it is characterized in that, described tuning screw includes along its length and successively along the first paragraph arranged near cavity direction and second segment, the outer surface of described first paragraph is provided with external screw thread, described second segment smooth surface, the external diameter of described second segment is less than the external diameter of described first paragraph, and it is protruding that described anodontia district is provided with a circle near one end of described cavity.
8. according to the cavity body filter described in any one of claim 1-7, it is characterized in that, described thread bush flushes near the surface of described cavity with described cover plate near one end of described cavity, and described thread bush exceeds the described cover plate surface away from described cavity away from one end of described cavity.
9. according to the cavity body filter described in any one of claim 1-3, it is characterised in that described cavity body filter also includes that fixed cover is located at described tuning screw top nut.
Cavity body filter the most according to claim 9, it is characterised in that described cavity body filter also includes being set in the packing ring on described tuning screw and between described nut and described cover plate.
11. according to the cavity body filter described in any one of claim 1-3, it is characterized in that, described cavity body filter also includes the resonant rod being fixed on described inside cavity, described cavity includes that described bottom surface is fixed in bottom surface and be perpendicular to the sidewall of described bottom surface, described resonant rod and described resonant rod has towards described tuning screw and internal diameter more than the upper shed of the external diameter of described tuning screw.
12. cavity body filters according to claim 11, it is characterised in that described bottom surface has boss, described resonant rod has the under shed towards described bottom surface, and described under shed is set on described boss, and described tuning plug is fixed with described boss by screw.
13. cavity body filters according to claim 11, it is characterised in that described upper shed is cylindrical, and with described tuning screw concentric.
14. cavity body filters according to claim 1, it is characterised in that meeting between described anodontia district and described internal threaded regions: 0 < D1-D2 < 0.5mm, wherein, D1 is the internal diameter in described anodontia district, and D2 is the internal diameter of described internal threaded regions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521133938.7U CN205452495U (en) | 2015-12-30 | 2015-12-30 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521133938.7U CN205452495U (en) | 2015-12-30 | 2015-12-30 | Cavity filter |
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| Publication Number | Publication Date |
|---|---|
| CN205452495U true CN205452495U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521133938.7U Active CN205452495U (en) | 2015-12-30 | 2015-12-30 | Cavity filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107615573A (en) * | 2015-12-30 | 2018-01-19 | 深圳市大富科技股份有限公司 | Cavity body filter |
| CN108631030A (en) * | 2017-03-22 | 2018-10-09 | Ace技术株式会社 | RF filters for improving PIMD performances |
| CN111384565A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
| CN111384488A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
| CN111384567A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
| CN111384496A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
-
2015
- 2015-12-30 CN CN201521133938.7U patent/CN205452495U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107615573A (en) * | 2015-12-30 | 2018-01-19 | 深圳市大富科技股份有限公司 | Cavity body filter |
| CN108631030A (en) * | 2017-03-22 | 2018-10-09 | Ace技术株式会社 | RF filters for improving PIMD performances |
| CN108631030B (en) * | 2017-03-22 | 2020-05-19 | Ace技术株式会社 | RF filter for improved PIMD performance |
| CN111384565A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
| CN111384488A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
| CN111384567A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
| CN111384496A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric resonator, dielectric filter and communication equipment |
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