CN203260702U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
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- CN203260702U CN203260702U CN 201320191371 CN201320191371U CN203260702U CN 203260702 U CN203260702 U CN 203260702U CN 201320191371 CN201320191371 CN 201320191371 CN 201320191371 U CN201320191371 U CN 201320191371U CN 203260702 U CN203260702 U CN 203260702U
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- cavity
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- bar
- dividing wall
- medium
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Abstract
The utility model discloses a cavity filter which comprises a cavity body and resonant bars. The cavity body comprises at least two resonant cavities, the resonant cavities are internally provided with the resonant bars, and an isolation wall is arranged between the two adjacent resonant cavities. A flying rod is fixed on the isolation wall, two ends of the flying rod respectively extend in the resonant cavities at two sides of the isolation wall, and at least one of the resonant bars includes a medium body and a conductive layer arranged on the surface of the medium body. A negative coupling coefficient between the resonant bars of the filter is achieved, and a transmission zero is generated after cross coupling.
Description
Technical field
The utility model relates to filter field, particularly relates to a kind of cavity body filter.
Background technology
Cavity body filter is widely used in the communications field as a kind of frequency selection device, field of radio frequency communication especially, and in the base station, filter is used for selecting signal of communication, clutter or interference signal that the filtering communication signal frequency is outer.
The effect of cavity body filter is with useful signal undamped passing through as far as possible, and unwanted signal is decayed as far as possible, and it is radio-frequency devices indispensable in the communication system; Generally be located at signal transmitting and receiving device or the circuit part of communication equipment, to realize the selection effect of communication equipment signal.The kind of filter is very many, but the Mathematical Modeling on its equivalent electric circuit and basis thereof is consistent.Its design needs to consider a lot of factors, following factor is arranged usually: volume and weight; Quality factor; Bandwidth; Tuning range; Coupled structure and power capacity; Costco Wholesale is made difficulty etc.Wherein, cross coupling structure has directly determined the filtering characteristic of filter.
But, there is not negative coupling coefficient between the resonant rod in the cavity body filter at present, after cross-couplings, without transmission zero, and the cross coupling structure weight in the cavity body filter is large, and cost is high, and manufacture craft is also comparatively complicated.
The utility model content
The utility model purpose is to realize between resonant rod in the filter negative coupling coefficient is arranged, and after the cross-couplings, produces transmission zero, and a kind of cavity body filter is provided.
For achieving the above object, the technical solution of the utility model is: a kind of cavity body filter, comprise cavity and resonant rod, and described cavity comprises at least two resonant cavitys, is provided with resonant rod in the described resonant cavity, is provided with dividing wall between the adjacent described resonant cavity; Be fixed with one on the described dividing wall and fly bar, the described two ends that fly bar are stretched into respectively in the resonant cavity of described dividing wall both sides, and one of them described resonant rod comprises the medium body and is arranged on this lip-deep conductive layer of described medium.
Preferably, described conductive layer is to be attached to one or more on the described medium body surface to have geometric conductive structure.
Preferably, described medium body is the medium cylinder, and described conductive layer is the metal cylinder that is set in outside the described medium cylinder or is positioned at described medium cylinder, and described metal cylinder is electrically connected with cavity.
Preferably, described dividing wall is provided with through hole, and an insulated support is set in described flying on the rod outer surface, and is stuck in the through hole of described dividing wall.
Preferably, the described bar that flies comprises a coupling bar, and perhaps the described bar that flies comprises a coupling bar and the coupling disc that is arranged on described coupling bar body of rod two ends.
Preferably, the area of described coupling disc is greater than described coupling bar two end cross-sectional areas.
Preferably, described coupling disc is that metal material is made.
Preferably, described coupling disc is that the metal wire coiling forms.
Preferably, described medium cylinder and metal cylinder are cylindrical.
Preferably, described medium cylinder is made greater than 1 dielectric material by dielectric constant.
Preferably, the metal cylinder of described metal cylinder for being made by single metal or alloy.
Preferably, described metal cylinder comprises matrix and the metal level that covers described matrix surface.
Preferably, described matrix is that nonmetallic materials are made, and perhaps makes for the metal material different from described metal level.
The utlity model has following advantage and effect:
1, the utility model adopts flies the bar structure, has realized between the resonant rod in the filter negative coupling coefficient being arranged, and after the cross-couplings, produces transmission zero, thereby has effectively promoted the filtering characteristic of cavity body filter.
2, structure of the present utility model realizes easily, and it is low effectively to save cost, enhances productivity.
Description of drawings
Fig. 1 is the utility model embodiment one described cavity body filter structural representation;
Fig. 2 is the utility model embodiment one described cavity body filter profile;
Fig. 3 is the utility model embodiment two described cavity body filter structural representations;
Fig. 4 a and 4b are the described resonant rod structural representations in the cavity body filter described in the utility model embodiment one, two.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.It will be apparent to those skilled in the art that in the following detailed description above-mentioned purpose of the present utility model, feature and advantage will be apparent.
Embodiment one
A kind of cavity body filter is provided, comprises: cavity 1, resonant cavity 2, dividing wall 3, resonant rod 4, fly bar 5 and insulated support 6.Wherein, as shown in Figure 1, comprise 2 resonant cavitys 2 in the described cavity 1, can certainly be for more than 2, present embodiment is only done exemplary illustration with the structure of 2 resonance controls, wherein, be provided with dividing wall 3 between the adjacent described resonant cavity 2, be fixed with on the described dividing wall 3 and fly bar 5, the described two ends that fly bar 5 are stretched into respectively in the resonant cavity 2 of described dividing wall 3 both sides, are provided with resonant rod 4 in the described resonant cavity 2.
As shown in Figure 2, described dividing wall 3 is provided with through hole, and described insulated support 6 is set in described flying on bar 5 outer surfaces, and is stuck in the through hole of described dividing wall 3; Described resonant rod 4 comprises medium cylinder 401 and the metal cylinder 402 that is arranged on described medium cylinder 401 outer walls or the inwall.
Described dividing wall 3 is arranged between the adjacent described resonant cavity 2, and described dividing wall 3 edges and described cavity 1 are fitted fixing, and preferably, described dividing wall 3 is structure as a whole with described cavity 1; Be provided with through hole on the wall body of described dividing wall 3, the position of described through hole and large I arrange according to the filtering characteristic of described filter, at this foregoing are not made restriction.
The described bar 5 that flies is round bar shape, comprise a coupling bar, its body of rod is arranged with described insulated support 6 outward, and put with the middle point symmetry of described insulated support 6 at the two ends of described coupling bar, and the described bar 5 that flies is stuck in the through hole of described dividing wall 3 by described insulated support 6.Certainly, the described bar 5 that flies can also be the cross coupling structure spare of other forms and structure, does not all consist of restriction of the present utility model.
Described resonant rod 4 is symmetricly set in the resonant cavity 2 of described dividing wall 3 both sides, and one of them described resonant rod comprises medium body and the conductive layer that is arranged on the described medium body surface, and for example conductive layer is the silver layer that is plated on the medium body surface.As shown in Figs. 4a and 4b, the medium body is medium cylinder 401, and conductive layer is the metal cylinder 402 that is arranged on described medium cylinder 401 outer walls or the inwall, and described medium cylinder 401 is cylindrical shape, described metal cylinder 402 is also cylindrical, and is set in described medium cylinder 401 inside or outside.Preferable alloy cylinder 402 bottoms are electrically connected with cavity bottom.Preferably, described medium cylinder 401 is made greater than 1 dielectric material by dielectric constant; Described metal cylinder 402 can be made by single metal or alloy.Wherein, the structure of metal cylinder can also preferably include matrix and cover the metal level of described matrix surface, thus the performance of Optimal Filter more; Particularly, described matrix is that nonmetallic materials are made, as: Teflon, pottery, aluminium oxide etc., perhaps make for the metal material different from described metal level, as: iron, copper, aluminium, steel etc., at this foregoing is not made detailed restriction.
Certainly, conductive layer also can be other version, for example for Direct Electroplating or evaporation or be splashed to metal level on the medium body, also can have geometric conductive structure for being attached to one or more on the medium body surface, the random geometries such as the split ring resonator that this conductive structure can consist of for I-shaped metal wire, metal wire, rectangular metal sheet.
Described insulated support 3 can be the cylindrical shape external member, the size of its inner diameter is adapted to the described body of rod diameter that flies bar 5, its length is identical with described dividing wall 3 thickness, described insulated support 3 is stuck in the described bar 5 that flies in the through hole of described dividing wall 3, makes that described to fly two parts body of rod that bar 5 stretches in the described resonant cavity 2 substantially isometric; At this foregoing is not made restriction.
Embodiment two
A kind of cavity body filter is provided, comprises: cavity 1, resonant cavity 2, dividing wall 3, resonant rod 4, fly bar 5 and insulated support 6.Wherein, as shown in Figure 3, described cavity 1 comprises 2 resonant cavitys 2, be provided with dividing wall 3 between the adjacent described resonant cavity 2, be fixed with on the described dividing wall 3 and fly bar 5, the described two ends that fly bar 5 are stretched into respectively in the resonant cavity 2 of described dividing wall 3 both sides, are provided with resonant rod 4 in the described resonant cavity 2, and the described bar 5 that flies comprises a coupling bar 501 and the coupling disc 502 that is arranged on described coupling bar 501 body of rod two ends.
As shown in Figure 3, the described bar 5 that flies, the coupling disc 502 that comprises a coupling bar 501 and body of rod two ends, the two ends of described coupling bar 501 are symmetrical arranged with the mid point of described insulated support 3, two coupling discs 502 lay respectively at the two ends of coupling bar 501, and the area of described coupling disc 502 is greater than 501 liang of end cross-sectional areas of described coupling bar.Preferably, the coupling disc that described coupling disc 502 processes for metal specifically can be the coil coupling dish that is formed by the metal wire coiling.Certainly, the described bar 5 that flies can also be the cross coupling structure spare of other forms and structure, does not all consist of restriction of the present utility model.
Described resonant rod 4 is symmetricly set in the resonant cavity 2 of described dividing wall 3 both sides, its structure is as shown in Figs. 4a and 4b, comprise medium cylinder 401 and the metal cylinder 402 that is arranged on described medium cylinder 401 outer walls or the inwall, identical among the structure of described resonant rod 4 and the material that adopts and the embodiment one, so no longer describe at this.
Described insulated support 3 should be adapted to the described body of rod diameter that flies bar 5 with the diameter that flies the junction inwall of bar 5, is sheathed on the described body of rod midpoint that flies bar 5, and is stuck in the through hole of described dividing wall 3; At this foregoing is not made restriction.
Above-mentioned explanation illustrates and has described some preferred embodiments of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to the disclosed form of this paper, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can in utility model contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not break away from spirit and scope of the present utility model, then all should be in the protection range of the utility model claims.
Claims (9)
1. a cavity body filter comprises cavity and resonant rod, it is characterized in that, described cavity comprises at least two resonant cavitys, is provided with resonant rod in the described resonant cavity, is provided with dividing wall between the adjacent described resonant cavity; Be fixed with one on the described dividing wall and fly bar, the described two ends that fly bar are stretched into respectively in the resonant cavity of described dividing wall both sides, and one of them described resonant rod comprises the medium body and is arranged on this lip-deep conductive layer of described medium.
2. cavity body filter as claimed in claim 1 is characterized in that, described conductive layer is to be attached to one or more on the described medium body surface to have geometric conductive structure.
3. cavity body filter as claimed in claim 1 is characterized in that, described medium body is the medium cylinder, and described conductive layer is the metal cylinder that is set in outside the described medium cylinder or is positioned at described medium cylinder, and described metal cylinder is electrically connected with cavity.
4. cavity body filter as claimed in claim 1 is characterized in that, described dividing wall is provided with through hole, and an insulated support is set in described flying on the rod outer surface, and is stuck in the through hole of described dividing wall.
5. cavity body filter as claimed in claim 4 is characterized in that, the described bar that flies comprises a coupling bar, and perhaps the described bar that flies comprises a coupling bar and the coupling disc that is arranged on described coupling bar body of rod two ends.
6. cavity body filter as claimed in claim 5 is characterized in that, the area of described coupling disc is greater than described coupling bar two end cross-sectional areas.
7. cavity body filter as claimed in claim 5 is characterized in that, described coupling disc is that the metal wire coiling forms.
8. cavity body filter as described in claim 3 is characterized in that described medium cylinder and metal cylinder are cylindrical.
9. cavity body filter according to claim 3 is characterized in that, described metal cylinder comprises matrix and covers the metal level of described matrix surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320191371 CN203260702U (en) | 2013-04-16 | 2013-04-16 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320191371 CN203260702U (en) | 2013-04-16 | 2013-04-16 | Cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203260702U true CN203260702U (en) | 2013-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320191371 Expired - Fee Related CN203260702U (en) | 2013-04-16 | 2013-04-16 | Cavity filter |
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| CN (1) | CN203260702U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218281A (en) * | 2014-08-27 | 2014-12-17 | 西安空间无线电技术研究所 | TE01 mode dielectric filter |
| CN104659444A (en) * | 2015-01-21 | 2015-05-27 | 江苏贝孚德通讯科技股份有限公司 | Broadband multiplexer |
| CN110739511A (en) * | 2018-07-20 | 2020-01-31 | 波音公司 | Tunable probe for high performance cross-coupled RF filters |
| CN113036358A (en) * | 2019-12-25 | 2021-06-25 | 深圳市大富科技股份有限公司 | Flying rod, flying rod assembly, cavity filter and communication equipment |
| CN114300822A (en) * | 2021-12-31 | 2022-04-08 | 广州广电计量检测股份有限公司 | Cavity filter |
-
2013
- 2013-04-16 CN CN 201320191371 patent/CN203260702U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218281A (en) * | 2014-08-27 | 2014-12-17 | 西安空间无线电技术研究所 | TE01 mode dielectric filter |
| CN104659444A (en) * | 2015-01-21 | 2015-05-27 | 江苏贝孚德通讯科技股份有限公司 | Broadband multiplexer |
| CN104659444B (en) * | 2015-01-21 | 2017-07-21 | 江苏贝孚德通讯科技股份有限公司 | A kind of broadband multiplexer |
| CN110739511A (en) * | 2018-07-20 | 2020-01-31 | 波音公司 | Tunable probe for high performance cross-coupled RF filters |
| CN113036358A (en) * | 2019-12-25 | 2021-06-25 | 深圳市大富科技股份有限公司 | Flying rod, flying rod assembly, cavity filter and communication equipment |
| CN114300822A (en) * | 2021-12-31 | 2022-04-08 | 广州广电计量检测股份有限公司 | Cavity filter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |