CN203707299U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
- Publication number
- CN203707299U CN203707299U CN201320864489.8U CN201320864489U CN203707299U CN 203707299 U CN203707299 U CN 203707299U CN 201320864489 U CN201320864489 U CN 201320864489U CN 203707299 U CN203707299 U CN 203707299U
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- China
- Prior art keywords
- cover plate
- composite material
- cavity
- material cover
- tuning screw
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Abstract
Provided is a cavity filter, comprising a cavity, a resonance rod and a composite material cover plate. The resonance rod is assembled in the cavity. The composite material cover plate and the cavity are sealed to form a resonant cavity. The composite material cover plate comprises an aluminium base material layer, and a copper foil layer. The copper foil layer is combined with the aluminium base material layer. The copper foil layer faces the resonant cavity. An elastic cover plate is disposed under the composite material cover plate. The elastic cover plate is provided with a tuning unit which tunes parameters of a filter to change a distance between the elastic cover plate and the resonance rod through making the elastic cover plate deform. The tuning unit is assembled out of the resonant cavity. The filter is high in reliability, convenient in assembling, simple in structure, and low in cost.
Description
Technical field
The utility model relates to a kind of filter, is in particular 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, especially field of radio frequency communication.In base station, filter is used for selecting signal of communication, the clutter outside filtering communication signal frequency or interference signal.
Cavity body filter need to meet by debugging the requirement of various radio-frequency (RF) index.In prior art, be by lock a large amount of adjustment screw on radio-frequency devices cover plate, the quantity of adjustment screw at least tens, hundreds of is thousands of at most, by regulating these adjustment screw to go deep into the difference of cavity length, thereby reaches the object of debugging radio frequency signal index.Traditional filter construction, comprises resonant rod, cavity, cover plate, tuning screw, cover plate is provided with screwed hole, tuning screw stretches in resonant cavity by the screwed hole on cover plate, forms structure capacitive with resonant rod, regulates filter by the depth that regulates tuning screw to screw in cover plate.
In the research and practice process to prior art, inventor's discovery of the present utility model,
A. filter tuner mode of the prior art is that the depth by regulating tuning screw to enter resonant rod is carried out tuned frequency and reached tuning object.But under this kind of pattern, the structure capacitive forming between tuning screw and resonant rod is very little, debug time is very long like this.
B., after having debugged, tuning screw will be deep in resonant cavity.And radiofrequency signal is transmitted at body surface, the male and fomale(M&F) of tuning screw can have a strong impact on product index like this, such as third order intermodulation, and Insertion Loss, high-power etc.
C. because electroplating quality in production process and thickness of coating can affect the roughness on the above screwed hole surface of cover plate and the size of described screwed hole, thereby cause tuning screw stuck or cannot mate with screwed hole, thereby, affect normal assembling and the normal work of filter, increased and electroplated the cost that various production problems that cover plate causes bring and increase.
Utility model content
For solving the problems of the technologies described above, the utility model embodiment provides a kind of cavity body filter, comprise cavity, resonant rod and composite material cover plate, described resonant rod is assemblied in cavity, described composite material cover plate and cavity sealing form resonant cavity, composite material cover plate comprises aluminium base layer and copper foil layer, and copper foil layer is compounded on aluminium base layer, and copper foil layer is towards resonant cavity; Described composite material cover plate has elastic cover plate, elastic cover plate is provided with and makes it that deformation occur, to change the distance between described elastic cover plate and described resonant rod, the parameter of filter is carried out to tuning tuner, described tuner is assemblied in outside described resonant cavity.
Concrete, tuner described in the utility model embodiment is a kind of device that comprises tuning screw and fixing tuning screw, described composite material cover plate is provided with screwed hole, described tuning screw is through described composite material cover plate and described screwed hole threaded engagement, wherein also comprise and the matching used nut of tuning screw and lock washer, so that tuning screw is fixed on composite material cover plate.
As preferably, composite material cover plate and elastic cover plate are screwed in resonant cavity top.
Real
beneficial effect:
With respect to prior art, cavity body filter and communication equipment that the utility model embodiment provides have the following advantages:
A. the elastic cover plate of cavity body filter and the relative area of resonant rod will be far longer than the relative area of tuning screw and resonant rod, and also under this pattern, electric capacity enlarges markedly, and tuning sensitivity increases.Therefore, easily tuning, the tuning time shortens greatly, has improved production efficiency.
B. tuning screw is isolated in outside resonant cavity, affects structure capacitive by adjustable elastic cover plate, has so just reduced signal in transmitting procedure because non-linear and produce low intermodulation, has improved the index of filter.
C. the composite material cover plate of the utility model filter is without plating, thereby the roughness and the dimensional accuracy that are opened in the screwed hole on composite material cover plate can effectively be ensured, thereby, improve the reliability of filter and reduced cost.In addition, the composite material cover plate of filter of the present utility model is easy to assembly and simple in structure.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present utility model.
Embodiment
In order to make of the present utility modelly to realize technological means, creation characteristic, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
For solving the problems of the technologies described above, the utility model embodiment provides a kind of cavity body filter, comprise cavity 1, resonant rod 2 and composite material cover plate 3, described resonant rod 2 is assemblied in cavity interior 1, described composite material cover plate 3 forms resonant cavity with cavity 1 sealing, composite material cover plate 3 comprises aluminium base layer 31 and copper foil layer 32, and copper foil layer 32 is compounded on aluminium base layer 31, and copper foil layer 32 is towards resonant cavity; Described composite material cover plate 3 has elastic cover plate 4, elastic cover plate 4 is provided with and makes it that deformation occur, to change the distance between described elastic cover plate 4 and described resonant rod 2, the parameter of filter is carried out to tuning tuner 5, described tuner 5 is assemblied in outside described resonant cavity.
Concrete, tuner 5 described in the utility model embodiment is a kind of device that comprises tuning screw 51 and fixing tuning screw, described composite material cover plate is provided with screwed hole, described tuning screw 51 is through described composite material cover plate 3 and described screwed hole threaded engagement, wherein also comprise and the matching used nut 51 of tuning screw and lock washer 53, tuning screw 51 is fixed on composite material cover plate to 3.
As preferably, composite material cover plate 3 and elastic cover plate 4 are fixed on resonant cavity top by screw 33.
Claims (3)
1. a cavity body filter, comprise cavity, resonant rod and composite material cover plate, it is characterized in that: described resonant rod is assemblied in cavity, described composite material cover plate and cavity sealing form resonant cavity, composite material cover plate comprises aluminium base layer and copper foil layer, copper foil layer is compounded on aluminium base layer, and copper foil layer is towards resonant cavity; Described composite material cover plate has elastic cover plate, elastic cover plate is provided with and makes it that deformation occur, to change the distance between described elastic cover plate and described resonant rod, the parameter of filter is carried out to tuning tuner, described tuner is assemblied in outside described resonant cavity.
2. a kind of cavity body filter according to claim 1, it is characterized in that: described tuner is a kind of device that comprises tuning screw and fixing tuning screw, described composite material cover plate is provided with screwed hole, described tuning screw is through described composite material cover plate and described screwed hole threaded engagement, wherein also comprise and the matching used nut of tuning screw and lock washer, so that tuning screw is fixed on composite material cover plate.
3. a kind of cavity body filter according to claim 1, is characterized in that: composite material cover plate and elastic cover plate are screwed in resonant cavity top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864489.8U CN203707299U (en) | 2013-12-17 | 2013-12-17 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864489.8U CN203707299U (en) | 2013-12-17 | 2013-12-17 | Cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707299U true CN203707299U (en) | 2014-07-09 |
Family
ID=51057695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320864489.8U Expired - Fee Related CN203707299U (en) | 2013-12-17 | 2013-12-17 | Cavity filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707299U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109314293A (en) * | 2017-01-13 | 2019-02-05 | 华为技术有限公司 | Cavity resonator, filter and communication equipment |
| WO2019178870A1 (en) * | 2018-03-23 | 2019-09-26 | 深圳市大富科技股份有限公司 | Filter and communication device |
-
2013
- 2013-12-17 CN CN201320864489.8U patent/CN203707299U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109314293A (en) * | 2017-01-13 | 2019-02-05 | 华为技术有限公司 | Cavity resonator, filter and communication equipment |
| CN109314293B (en) * | 2017-01-13 | 2021-02-09 | 华为技术有限公司 | Cavity resonator, filter and communication equipment |
| US10978775B2 (en) | 2017-01-13 | 2021-04-13 | Huawei Technologies Co., Ltd. | Cavity resonator, filter, and communications device |
| WO2019178870A1 (en) * | 2018-03-23 | 2019-09-26 | 深圳市大富科技股份有限公司 | Filter and communication device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20140709 Termination date: 20141217 |
|
| EXPY | Termination of patent right or utility model |