CN203707298U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
- Publication number
- CN203707298U CN203707298U CN201320864487.9U CN201320864487U CN203707298U CN 203707298 U CN203707298 U CN 203707298U CN 201320864487 U CN201320864487 U CN 201320864487U CN 203707298 U CN203707298 U CN 203707298U
- Authority
- CN
- China
- Prior art keywords
- cavity
- cover plate
- filter
- resonant rod
- boss
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a cavity filter, comprising a cavity and a cover plate covered on the cavity. The cavity is provided with a resonance rod and an annular body. The bottom of the cavity is provided with a boss. The resonance rod is fixed on the bottom boss of the cavity through a set screw. The annular body is assembled on a lower surface of the cover plate. The surface of the annular body and the surface of the resonance rod form a capacitor. The cover plate is provided with a threaded hole. The cover plate also comprises a tuning screw rod cooperating with the threaded hole. The tuning screw rod is disposed in the annular body. The cavity filter provided in an embodiment can satisfy frequency-selecting requirements of a low-frequency filter. On one hand, the cavity filter in the structure increases capacitance, and on the other hand, the filter is more convenient to assemble, and prevents discharge phenomena which generates sparks, and prevents short circuit, thereby improving product technical index.
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-selecting equipment.In prior art, cavity body filter comprises cavity resonant bar, cover plate and is located at the tuning screw in cover plate, in low band filter design, in order to reduce resonance frequency, conventionally can, in the structure of resonant rod end loading capacitance disk to increase electric capacity, reduce frequency.Can not be too large owing to being subject to cavity size to affect the diameter of electric capacity disk, can only meet by increasing again a side electric capacity on the basis at electric capacity disk the more low frequency needs of filter, waste material.
Utility model content
In order to solve the problem that has resonant rod and the one-body molded existing waste of material of capacitance disk in prior art, the utility model provides a kind of cavity body filter to adopt and ring bodies has on the cover board been set to realize the low frequency requirement of cavity body filter.
For achieving the above object, the utility model provides following technical scheme: a kind of cavity body filter, comprise cavity and be covered on the cover plate on cavity, in described cavity, be provided with resonant rod and ring bodies, cavity bottom is provided with boss, described resonant rod is fixed on cavity bottom boss by fixed screw, and described boss height is not more than 1mm, and its cross-sectional sizes is identical with resonant rod; Described resonant rod bottom is provided with counterbore, and the counterbore degree of depth is not more than 0.8mm; Described ring bodies is assemblied in described cover plate lower surface, and the surface of described ring bodies and the surface of described resonant rod form electric capacity.
Described cover plate is provided with screwed hole, described cover plate also comprise match with screwed hole for regulating the tuning screw of filter parameter.Described tuning screw is arranged in described ring bodies, reaches the object of fine setting by regulating tuning screw to stretch into the depth in cavity.
beneficial effect:
The cavity body filter that the utility model embodiment provides and communication equipment, adopt the mode that ring bodies or projection are set on the cover plate of cavity body filter or cavity, the cavity body filter of this kind of structure has increased the capacitance in cavity on the one hand, has reduced frequency, can meet the demand of low frequency filtering, on the other hand, assemble more conveniently, avoid occurring electric discharge phenomena, produce spark, cause short circuit, thereby improve the technical indicator of product.
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.
In the utility model embodiment, a kind of cavity body filter, comprise cavity 1 and be located at the cover plate 3 on cavity 1, in described cavity 1, be provided with resonant rod 2, cavity 1 bottom is provided with boss 8, described resonant rod 2 is fixed on cavity 1 bottom boss 8 by fixed screw 9, and described boss 8 is highly not more than 1mm, and its cross-sectional sizes is identical with resonant rod 2; Described resonant rod 2 bottoms are provided with counterbore 7, and counterbore 7 degree of depth are not more than 0.8mm; Described cover plate 3 lower surfaces are provided with ring bodies 4, and the surface of the surface of described ring bodies 4 and described resonant rod 2 forms electric capacity.
Described cover plate 3 is provided with screwed hole 5, described cover plate 3 also comprise match with screwed hole 5 for regulating the tuning screw 6 of filter parameter.Described tuning screw 6 is arranged in described ring bodies 4, reaches the object of fine setting by regulating tuning screw 6 to stretch into the depth in cavity.
More than show and described general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.Claimed scope of the present utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. a cavity body filter, comprise cavity and be covered on the cover plate on cavity, in described cavity, be provided with resonant rod and ring bodies, cavity bottom is provided with boss, described resonant rod is fixed on cavity bottom boss by fixed screw, described ring bodies is assemblied in described cover plate lower surface, and the surface of described ring bodies and the surface of described resonant rod form electric capacity.
2. a kind of cavity body filter according to claim 1, it is characterized in that: described boss height is not more than 1mm, and its cross-sectional sizes is identical with resonant rod.
3. a kind of cavity body filter according to claim 1, is characterized in that: described resonant rod bottom is provided with counterbore, and the counterbore degree of depth is not more than 0.8mm.
4. a kind of cavity body filter according to claim 1, is characterized in that: described cover plate is provided with screwed hole, described cover plate also comprises the tuning screw matching with screwed hole; Described tuning screw is arranged in described ring bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864487.9U CN203707298U (en) | 2013-12-17 | 2013-12-17 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864487.9U CN203707298U (en) | 2013-12-17 | 2013-12-17 | Cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707298U true CN203707298U (en) | 2014-07-09 |
Family
ID=51057694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320864487.9U Expired - Fee Related CN203707298U (en) | 2013-12-17 | 2013-12-17 | Cavity filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707298U (en) |
-
2013
- 2013-12-17 CN CN201320864487.9U patent/CN203707298U/en not_active Expired - Fee Related
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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 |