CN213584102U - Miniaturized ceramic dielectric passband filter - Google Patents
Miniaturized ceramic dielectric passband filter Download PDFInfo
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- CN213584102U CN213584102U CN202023140727.XU CN202023140727U CN213584102U CN 213584102 U CN213584102 U CN 213584102U CN 202023140727 U CN202023140727 U CN 202023140727U CN 213584102 U CN213584102 U CN 213584102U
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- ceramic dielectric
- miniaturized
- passband filter
- shielding cover
- metal
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- 239000000919 ceramic Substances 0.000 title claims abstract description 57
- 229910052751 metal Inorganic materials 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 238000001465 metallisation Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a miniaturized ceramic dielectric passband filter, including ceramic dielectric main part and metallic shield cover. The ceramic dielectric body is a cuboid, and the shortest side length is 2mm-3 mm. The ceramic dielectric body is formed by pressing powder with the dielectric constant of 20-130, and comprises an open surface and a short-circuit surface which are oppositely arranged, and side surfaces arranged at the periphery of the open surface and the short-circuit surface. The metal shielding cover is welded on one side surface of the ceramic dielectric main body, and meanwhile, the grounding end of the metal shielding cover is directly welded on the open surface. The utility model discloses a high dielectric constant's powder can reduce the size of wave filter. The metal shielding cover welds simultaneously in the open face and a side of dielectric filter main part, makes the suppression of its near-end and distal end become good, and simultaneously, shielding cover earthing terminal beading is in open face, and production debugging process can be more convenient, so the utility model has the advantages of high suppression, it is miniaturized, easily debugging processing.
Description
Technical Field
The utility model relates to a miniaturized ceramic dielectric passband filter.
Background
The filter is of various kinds, and different kinds of filters are applied in different frequency ranges and different occasions. The dielectric filter is constructed by coupling between dielectric resonators. Dielectric resonator filters have high Q-values, low insertion losses, small dimensions, and light weight, and are widely used in wireless base stations, satellite communications, navigation systems, electronic countermeasure systems, and the like.
The ceramic dielectric filter is mainly applied to a microwave communication system and can effectively obtain a required frequency range. In recent years, with the rapid development of microwave communication systems, filter manufacturers have made higher demands on the production of filters, particularly in terms of miniaturization and high suppression, and in terms of improvement in efficiency of production debugging processes. Generally, the volume of the dielectric filter is large, the difficulty of debugging procedures is high, and the requirements of miniaturization and efficient shipment of filter manufacturers cannot be met. Therefore, it is necessary to provide a ceramic dielectric passband filter which is easy to debug and process, has a small size, and is excellent in suppression.
SUMMERY OF THE UTILITY MODEL
To the background art, the utility model aims to provide a can satisfy the miniaturized and high-efficient shipment demand of filter firm wave filter.
A miniaturized ceramic dielectric passband filter includes a ceramic dielectric body and a metal shield.
Specifically, the ceramic dielectric body is a cuboid, and the shortest side length is 2-3 mm. The ceramic dielectric body is formed by pressing powder with the dielectric constant of 20-130, and comprises an open surface and a short-circuit surface which are oppositely arranged, and side surfaces arranged at the periphery of the open surface and the short-circuit surface.
The metal shielding cover is welded on one side surface of the ceramic dielectric main body, and meanwhile, the grounding end of the metal shielding cover is directly welded on the open surface.
The utility model discloses a high dielectric constant's powder can reduce the size of wave filter. The metal shielding cover welds simultaneously in the open face and a side of dielectric filter main part, makes the suppression of its near-end and distal end become good, and simultaneously, shielding cover earthing terminal beading is in open face, and production debugging process can be more convenient, so the utility model has the advantages of high suppression, it is miniaturized, easily debugging processing.
Preferably, the metal shielding case comprises a top plate and a side plate, and the top plate and the side plate are connected in a 90-degree manner; the top plate is attached to the open surface of the ceramic dielectric main body, and the side plate is attached to the side surface of the ceramic dielectric main body; one end of the top plate, which is far away from the side plate, is provided with an insertion plate bent downwards by 90 degrees; the insert plate is welded to the open face of the ceramic dielectric body.
Preferably, the metal shielding case is a metal sheet with a thickness of 0.2mm-0.4 mm.
Preferably, the metal shielding case comprises at least one hollow window.
Preferably, the metal shield is soldered to the ceramic dielectric body by a soldering process.
Preferably, at least 4 through holes which are parallel to each other and have central axes are arranged on the open surface; forming a metal loading layer on the periphery of the through hole through metallization treatment; an input electrode and an output electrode are arranged on the side surface; the input electrode is connected with a line to form an input coupling electrode; the output electrode is connected with a line to form an output coupling electrode; and capacitive coupling is formed between the metal loading layers of the middle two through holes.
The utility model discloses in, with input electrode and output electrode respectively with the lines connection form coupling electrode to reduce dielectric filter's electrode time delay.
Preferably, the metal loading layer is formed by engraving a silver layer on the ceramic dielectric body by a silver immersion metallization process, and the thickness of the metal loading layer is 8-20 um.
Preferably, the width of the line is 0.15mm or more.
Preferably, the lines are laid according to a set zigzag shape; the metal loading layer is covered according to a set saw-tooth shape, so that input and output coupling is enhanced.
Preferably, the ceramic dielectric body is press-formed from a powder having a dielectric constant of 37.
The utility model provides a miniaturized ceramic dielectric passband filter has following advantage:
1. the size of the filter can be reduced by adopting the powder with high dielectric constant;
2. the metal shielding cover is welded on the open surface and one side surface of the dielectric filter main body at the same time, so that the near end and the far end of the metal shielding cover are better inhibited, and meanwhile, the grounding end of the shielding cover is directly welded on the open surface, so that the production and debugging process is more convenient;
3. the input electrode and the output electrode are respectively connected with the lines to form the coupling electrode, so that the electrode time delay of the dielectric filter is reduced.
Drawings
FIG. 1 is a side view of a low insertion loss ceramic dielectric passband filter;
FIG. 2 is a second axial side view of a low insertion loss ceramic dielectric passband filter;
FIG. 3 is a side view of a low insertion loss ceramic dielectric passband filter;
FIG. 4 is an isometric view of a ceramic dielectric body;
FIG. 5 is a metal shield;
FIG. 6 is a waveform diagram of an actual test of a low insertion loss ceramic dielectric passband filter;
the labels in the figures are: ceramic dielectric body 1, open face 11, short circuit face 12, through hole 13, metal loading layer 14, input electrode 15, output electrode 16, line 17, silver metal block 18, metal shielding case 2, top plate 21, side plate 22 and insertion plate 23.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
A miniaturized ceramic dielectric passband filter, please refer to FIGS. 1 to 3, comprises a ceramic dielectric body 1 and a metal shielding case 2.
Specifically, referring to fig. 1 to 4, the ceramic dielectric body 1 is a rectangular parallelepiped, and in order to miniaturize the filter size, the ceramic dielectric body 1 is formed by pressing powder having a dielectric constant of 37, and the shortest side length thereof is 2.5 mm.
The device comprises an open surface 11 and a short-circuit surface 12 which are oppositely arranged, and side surfaces arranged on the periphery of the open surface 11 and the short-circuit surface 12.
The open face 11 is provided with four through holes 13 arranged side by side and having central axes parallel to each other. The periphery of the through hole 13 is metallized to form a metal loading layer 14. An input electrode 15 and an output electrode 16 are provided on the side faces. The input electrode 15 is connected with a line 17 to form a coupling electrode, and forms input coupling with the metal loading layer 14 of the through hole 13 close to the side of the input electrode 15. The output electrode 16 is connected with another line 17 to form a coupling electrode, and forms output coupling with the metal loading layer 14 of the through hole 13 close to the output electrode 16 side. Capacitive coupling is formed between the metal loading layers 14 of the middle two through holes 13. The utility model discloses in, connect input electrode 15 and output electrode 16 with lines 17 respectively and form coupling electrode to reduce dielectric filter's electrode time delay, make the rectangular coefficient of its wave filter better.
In this embodiment, the metal loading layer 14 is formed by engraving a silver layer on the ceramic dielectric body 1 by a silver immersion metallization process, and the thickness is 10 um. The width of the lines 17 is equal to 0.2mm, in other embodiments the lines 17 are laid according to a set shape. The metal loading layer 14 is covered according to a set shape. The set shape is a pattern with a specific electrical function.
Referring to fig. 5, the metal shielding can 2 is simultaneously soldered to one side of the ceramic dielectric body 1 by a soldering process, and the ground terminal of the metal shielding can 2 is directly soldered to the open surface 11.
Preferably, the metal shielding case 2 is a metal sheet with a thickness of 0.3mm, and includes a top plate 21 and a side plate 22, and the top plate 21 and the side plate 22 are connected at 90 °. The top plate 21 is attached to the open surface 11 of the ceramic dielectric body 1, and the side plate 22 is attached to the side surface of the ceramic dielectric body 1; the end of the top plate 21 far away from the side plate 22 is provided with an insertion plate 23 bent downwards by 90 degrees. The insert plate 23 is welded to the metallic silver block 18 on the open face of the ceramic dielectric body 1.
The utility model discloses a high dielectric constant's powder can reduce the size of wave filter. The metal shielding case 2 welds simultaneously at the open face 11 and a side of dielectric filter main part, makes the suppression of its near-end and distal end become good, and simultaneously, shielding case earthing terminal beading is at open face 11, and the production debugging process can be more convenient, so the utility model has the advantages of high suppression, the miniaturization, easily debugging processing etc.
As shown in fig. 6, the actual test waveform of the present invention has a center frequency of 3475MHz, a minimum center insertion loss of 1.2dB, a bandwidth BW of 350MHz, and a bandwidth sideband insertion loss of less than 2.5 dB.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A miniaturized ceramic dielectric passband filter, characterized in that:
comprises a ceramic dielectric main body and a metal shielding cover;
the ceramic dielectric main body is a cuboid, and the shortest side length is 2mm-3 mm; the ceramic dielectric body is formed by pressing powder with the dielectric constant of 20-130 and comprises an open surface and a short circuit surface which are oppositely arranged and side surfaces arranged at the periphery of the open surface and the short circuit surface;
the metal shielding cover is welded on one side surface of the ceramic dielectric main body, and meanwhile, the grounding end of the metal shielding cover is directly welded on the open surface.
2. The miniaturized ceramic dielectric passband filter of claim 1, wherein:
the metal shielding cover comprises a top plate and a side plate, and the top plate and the side plate are connected in a 90-degree manner; the top plate is attached to the open surface of the ceramic dielectric main body, and the side plate is attached to the side surface of the ceramic dielectric main body; one end of the top plate, which is far away from the side plate, is provided with an insertion plate bent downwards by 90 degrees; the insert plate is welded to the open face of the ceramic dielectric body.
3. The miniaturized ceramic dielectric passband filter of claim 1, wherein:
the metal shielding cover is a metal sheet, and the thickness of the metal shielding cover is 0.2mm-0.4 mm.
4. The miniaturized ceramic dielectric passband filter of claim 1, wherein:
the metal shielding cover comprises at least one hollow window.
5. The miniaturized ceramic dielectric passband filter of claim 1, wherein:
the metal shield is welded to the ceramic dielectric body by a soldering process.
6. The miniaturized ceramic dielectric passband filter of claim 1, wherein:
the open surface is provided with at least 4 through holes which are arranged side by side and have mutually parallel central axes; forming a metal loading layer on the periphery of the through hole through metallization treatment; an input electrode and an output electrode are arranged on the side surface; the input electrode is connected with a line to form an input coupling electrode, the output electrode is connected with a line to form an output coupling electrode, and capacitive coupling is formed between the metal loading layers of the two through holes in the middle.
7. The miniaturized ceramic dielectric passband filter of claim 6, wherein:
the metal loading layer is formed by engraving a silver layer on the ceramic dielectric main body by a silver immersion metallization process, and the thickness of the metal loading layer is 8-20 um.
8. The miniaturized ceramic dielectric passband filter of claim 6, wherein:
the width of the lines is greater than or equal to 0.15 mm.
9. The miniaturized ceramic dielectric passband filter of claim 6, wherein:
the lines are laid according to a set saw-tooth shape; the metal loading layer covers according to a set sawtooth shape.
10. The miniaturized ceramic dielectric passband filter of claim 6, wherein:
the ceramic dielectric body is formed by pressing powder with the dielectric constant of 37.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023140727.XU CN213584102U (en) | 2020-12-22 | 2020-12-22 | Miniaturized ceramic dielectric passband filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023140727.XU CN213584102U (en) | 2020-12-22 | 2020-12-22 | Miniaturized ceramic dielectric passband filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213584102U true CN213584102U (en) | 2021-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023140727.XU Active CN213584102U (en) | 2020-12-22 | 2020-12-22 | Miniaturized ceramic dielectric passband filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213584102U (en) |
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2020
- 2020-12-22 CN CN202023140727.XU patent/CN213584102U/en active Active
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Address after: No. 1203, Jinting Road, Jimei District, Xiamen City, Fujian Province Patentee after: Xiamen Songyuan Electronics Co.,Ltd. Address before: No. 1203, Jinting Road, Jimei District, Xiamen City, Fujian Province Patentee before: Xiamen Sunyear Electronics Co.,Ltd. |