CN211046885U - Miniaturized crystal filter with shielding device - Google Patents
Miniaturized crystal filter with shielding device Download PDFInfo
- Publication number
- CN211046885U CN211046885U CN201922268356.4U CN201922268356U CN211046885U CN 211046885 U CN211046885 U CN 211046885U CN 201922268356 U CN201922268356 U CN 201922268356U CN 211046885 U CN211046885 U CN 211046885U
- Authority
- CN
- China
- Prior art keywords
- filter
- metal
- bottom plate
- crystal filter
- shielding device
- 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
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 46
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000009966 trimming Methods 0.000 claims description 3
- ZGHQUYZPMWMLBM-UHFFFAOYSA-N 1,2-dichloro-4-phenylbenzene Chemical compound C1=C(Cl)C(Cl)=CC=C1C1=CC=CC=C1 ZGHQUYZPMWMLBM-UHFFFAOYSA-N 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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- Filters And Equalizers (AREA)
- Coils Or Transformers For Communication (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The embodiment of the utility model discloses miniaturized crystal filter with shield assembly, crystal filter includes wave filter body and metal shield assembly. Through set up specific metal shield assembly in crystal filter, can shield crystal filter internal component to can effectively increase crystal ground connection area, improve crystal filter's stop band attenuation index under the small size.
Description
Technical Field
The embodiment of the utility model provides a relate to crystal filter technical field, concretely relates to miniaturized crystal filter with shield assembly.
Background
A crystal filter (crystal filter) is a filter composed of crystal resonators. The miniaturized crystal filter, like the common quartz crystal filter, is constructed by the crystal, because the product is small in size, and the smaller the size, the more the interference factors caused by the distribution parameters of the internal elements of the filter are, the more difficult the stopband attenuation index of the crystal filter is to be improved, in the prior art, the stopband attenuation of the filter can be best realized to 65dB, but a certain distance is reserved from the ideal index requirement of 80 dB. The most effective solution for improving the stopband attenuation of the miniaturized crystal filter is to increase the grounding area of the crystal of the key element and to take shielding measures for the internal elements.
SUMMERY OF THE UTILITY MODEL
Therefore, the embodiment of the present invention provides a miniaturized crystal filter with a shielding device to solve the problem of low stop band attenuation index value of the existing miniaturized crystal filter.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: the utility model provides a miniaturized crystal filter with shield assembly, crystal filter includes filter body and metal shield assembly, the filter body includes the filter bottom plate and sets up the PCB board of filter bottom plate top, metal shield assembly sets up between filter bottom plate and the PCB board, metal shield assembly's upper end is connected PCB board and its lower extreme are connected the filter bottom plate.
Further, the metal shielding device includes the metal bottom plate and with a plurality of metal picture peg of metal bottom plate vertical connection, it is a plurality of the metal picture peg sets up according to predetermineeing the interval, the metal bottom plate with the welding of wave filter bottom plate, it is provided with a plurality of jacks to correspond on the PCB board, the metal picture peg with the jack forms the cooperation of pegging graft.
Further, still be provided with a plurality of fine setting electric capacity and monolithic electric capacity above the PCB board.
Furthermore, a plurality of crystals are uniformly arranged below the PCB, and a plurality of inductance coils are arranged above the bottom plate of the filter.
Further, the filter body further comprises a connecting structure for connecting the filter bottom plate and the PCB.
The embodiment of the utility model provides a have following advantage:
the embodiment of the utility model provides a miniaturized crystal filter with shield assembly, crystal filter includes wave filter body and metal shield assembly. Through set up specific metal shield assembly in crystal filter, can shield crystal filter internal component to can effectively increase crystal ground connection area, improve crystal filter's stop band attenuation index under the small size.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is a schematic structural diagram of a miniaturized crystal filter with a shielding device according to embodiment 1 of the present invention;
fig. 2 is a schematic position diagram of a miniaturized crystal filter metal shielding device with a shielding device according to embodiment 1 of the present invention;
fig. 3 is a schematic bottom structure diagram of a miniaturized crystal filter PCB board with a shielding device according to embodiment 1 of the present invention;
fig. 4 is a schematic front structural diagram of a miniaturized crystal filter PCB board with a shielding device according to embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of a miniaturized crystal filter metal shielding device with a shielding device according to embodiment 1 of the present invention;
fig. 6 is a schematic side view of a metal plug board of a miniaturized crystal filter provided with a shielding device according to embodiment 1 of the present invention.
In the figure: the filter comprises a filter body 1, a metal shielding device 2, a filter bottom plate 11, a PCB 12, a crystal 13, an inductance coil 14, a trimming capacitor 15, a monolithic capacitor 16, a connecting structure 17, a jack 18, a metal bottom plate 21 and a metal inserting plate 22.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1 and 2, the present embodiment proposes a miniaturized crystal filter with a shielding device, which includes a filter body 1 and a metal shielding device 2.
The filter body 1 includes a filter chassis 11 and a PCB board 12 disposed above the filter chassis 11. As shown in fig. 3 and 4, a plurality of crystals 13 are uniformly disposed below the PCB 12, and a plurality of inductors 14 are disposed above the filter substrate 11. A plurality of trimming capacitors 15 and monolithic capacitors 16 are also disposed above the PCB 12. Further, the filter body 1 further comprises a connection structure 17 connecting the filter chassis 11 and the PCB 12.
The metal shielding device 2 is disposed between the filter chassis 11 and the PCB 12, and the upper end of the metal shielding device 2 is connected to the PCB 12 and the lower end thereof is connected to the filter chassis 11. As shown in fig. 5 and 6, the metal shielding device 2 includes a metal base plate 21 and a plurality of metal insertion plates 22 vertically connected to the metal base plate 21, the plurality of metal insertion plates 22 are disposed at a predetermined interval to separate internal components into different regions, the metal base plate 21 is welded to the filter base plate 11, a plurality of insertion holes 18 are correspondingly disposed on the PCB 12, and the metal insertion plates 22 are inserted into the insertion holes 18 and welded to the grounding device of the PCB 12.
The metal bottom plate 21 is welded with the filter bottom plate 11 into a whole, and the top of the metal inserting plate 22 is inserted into the jack on the PCB 12 and welded on the PCB 12, so that the grounding area of the PCB 12 and the filter bottom plate 11 is increased; meanwhile, the blocking of the metal bottom plate 21 and the metal inserting plate 22 can play a role in shielding, so that the influence of distribution parameters of internal elements is reduced, and the requirement of high-band attenuation of the small-volume crystal filter is met.
The embodiment of the utility model provides a miniaturized crystal filter with shield assembly, this crystal filter include filter body and metal shield assembly. Through set up specific metal shield assembly in crystal filter, can shield crystal filter internal component to can effectively increase crystal ground connection area, improve crystal filter's stop band attenuation index under the small size.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. The utility model provides a miniaturized crystal filter with shield assembly, its characterized in that, crystal filter includes filter body and metal shield assembly, the filter body includes the filter bottom plate and sets up the PCB board of filter bottom plate top, metal shield assembly sets up between filter bottom plate and the PCB board, metal shield assembly's upper end is connected PCB board and its lower extreme are connected the filter bottom plate.
2. The miniaturized crystal filter with the shielding device of claim 1, wherein the metal shielding device comprises a metal bottom plate and a plurality of metal insertion plates vertically connected with the metal bottom plate, the plurality of metal insertion plates are arranged according to a preset interval, the metal bottom plate is welded with the filter bottom plate, a plurality of insertion holes are correspondingly arranged on the PCB, and the metal insertion plates and the insertion holes form an insertion fit.
3. The miniaturized crystal filter with shielding device of claim 1 wherein a plurality of trimming capacitors and monolithic capacitors are further disposed above the PCB.
4. The miniaturized crystal filter with shielding device of claim 1 wherein a plurality of crystals are uniformly disposed under the PCB board and a plurality of inductors are disposed over the bottom plate of the filter.
5. The miniaturized crystal filter of claim 1 wherein the filter body further comprises a connection structure connecting the filter chassis and the PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922268356.4U CN211046885U (en) | 2019-12-17 | 2019-12-17 | Miniaturized crystal filter with shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922268356.4U CN211046885U (en) | 2019-12-17 | 2019-12-17 | Miniaturized crystal filter with shielding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211046885U true CN211046885U (en) | 2020-07-17 |
Family
ID=71567391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922268356.4U Expired - Fee Related CN211046885U (en) | 2019-12-17 | 2019-12-17 | Miniaturized crystal filter with shielding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211046885U (en) |
-
2019
- 2019-12-17 CN CN201922268356.4U patent/CN211046885U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200717 |