CN105098300A - Common-mode filter and manufacturing method therefor - Google Patents
Common-mode filter and manufacturing method therefor Download PDFInfo
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- CN105098300A CN105098300A CN201510578516.9A CN201510578516A CN105098300A CN 105098300 A CN105098300 A CN 105098300A CN 201510578516 A CN201510578516 A CN 201510578516A CN 105098300 A CN105098300 A CN 105098300A
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- printing medium
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- mode filter
- silver
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000007639 printing Methods 0.000 claims abstract description 127
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052709 silver Inorganic materials 0.000 claims abstract description 40
- 239000004332 silver Substances 0.000 claims abstract description 40
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 239000000919 ceramic Substances 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 20
- 235000013980 iron oxide Nutrition 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 230000003647 oxidation Effects 0.000 claims description 16
- 238000007254 oxidation reaction Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 6
- 238000007747 plating Methods 0.000 claims description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 235000006708 antioxidants Nutrition 0.000 claims description 3
- 229940067573 brown iron oxide Drugs 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- PIRWNASAJNPKHT-SHZATDIYSA-N pamp Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCNC(N)=N)C(N)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@H](C)NC(=O)[C@@H](NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](C)N)C(C)C)C1=CC=CC=C1 PIRWNASAJNPKHT-SHZATDIYSA-N 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000009461 vacuum packaging Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000001914 filtration Methods 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention provides a common-mode filter. The common-mode filter comprises a printing dielectric layer and a main body layer, wherein a silver circuit is printed and formed in the printing dielectric layer. The invention also provides a manufacturing method for the common-mode filter; the silver circuit is printed on the printing dielectric layer through silver powder; a whole body formed by the main body layer and the printing layer is put into a hydraulic pressure bag; the hydraulic pressure bag is pressurized by using a hydraulic pump, and the whole body is laminated by the hydraulic pressure in the hydraulic pressure bag. The size of the common-mode filter of the invention is only half of the size of the existing common-mode filter, so that the dimensional requirement of small-scale precision device on the common-mode filter can be met; and in addition, the common-mode filter is good in filtering effect, simple in manufacturing method and low in cost.
Description
Technical field
The present invention relates to a kind of common-mode filter and manufacture method thereof.
Background technology
Common-mode filter is in fact a bidirectional filter: on the one hand common mode electromagnetic interference on filtered signal line, and suppression itself does not outwards send electromagnetic interference on the other hand, avoids affecting the normal work of other electronic equipments under same electromagnetic environment.
Common-mode filter can transmit difference mode signal, and the difference mode signal that direct current and frequency are very low can pass through, and then presents very large impedance for high frequency common mode noise, has played the effect of impedor, can be used for suppressing common mode current interference.
Be applicable to high band and low-frequency range to make common-mode filter simultaneously, two-stage laminated type common-mode filter structure can be adopted, one-level uses the material of high magnetic permeability, high-dielectric coefficient, as ferrite, the common mode interference signal of filtering tens MHz or more high band, another grade adopts the material of low magnetic permeability, low-k, as noncrystal, and the common mode interference signal of below filtering 1MHz or hundreds of kHz.
Existing a lot of miniature precision equipment needs size less, the better common-mode filter of filter effect, and existing production technology is difficult to reach such requirement, can meet the requirements of often complex process, and cost is higher.
In view of this, be necessary to be improved existing common-mode filter and manufacture method thereof, to solve the problem.
Summary of the invention
The object of the present invention is to provide a kind of common-mode filter and manufacture method thereof, large to solve existing common-mode filter size, manufacturing cost is high, the problem of manufacturing process complexity.
For achieving the above object, the invention provides a kind of common-mode filter, comprise layer of printing medium and body layer, in described layer of printing medium, printing forms silver circuit, described body layer has two-layer, described layer of printing medium has four layers, and four layers of described layer of printing medium are located between two-layer described body layer, described body layer is the rectangular configuration using iron oxide material tape lamination to be formed, described layer of printing medium is respectively the first layer of printing medium from top to bottom, second layer of printing medium, 3rd layer of printing medium and the 4th layer of printing medium, described first layer of printing medium is provided with through hole, silver circuit in described first layer of printing medium is through the silver connection on described through hole and described second layer of printing medium, described 3rd layer of printing medium is provided with through hole, silver circuit in described 3rd layer of printing medium is through the silver connection on described through hole and described 4th layer of printing medium.
As a further improvement on the present invention, every layer of layer of printing medium is equipped with the electrode exporting to described layer of printing medium edge from silver circuit.
As a further improvement on the present invention, described common-mode filter is that square type is arranged, and described common-mode filter length range is 1.15-1.35mm, and width range is 0.9-1.1mm, and altitude range is 0.5-0.7mm.
As a further improvement on the present invention, the material of described layer of printing medium is that insulating material is conducted to prevent the silver circuit in each layer of printing medium.
As a further improvement on the present invention, the oxidation iron plate increasing resistance is provided with in the middle part of the figure that the silver circuit of described every layer of layer of printing medium surrounds.
The present invention also provides a kind of manufacture method of common-mode filter, and the manufacture method of described common-mode filter mainly comprises the following steps:
Brown iron oxide and pottery are provided;
Partial oxidation iron powder is made some material strips, all the other brown iron oxides and pottery are made iron oxide slurry and ceramic size respectively;
Use pressing machine that some material strip laminations are formed body layer, described body layer comprises the upper body layer and lower body layer that are formed as the upper and lower both sides of common-mode filter respectively;
Lower body layer is fixedly fitted in machine table;
Utilize printing machine that ceramic size is printed out ceramic layer on lower body layer, the relative both sides of ceramic layer print out elongated iron oxide layer, print out oxidation iron plate in the middle part of ceramic layer and print out circuit around oxidation iron plate, described circuit exports to described ceramic layer edge and forms electrode, and described ceramic layer, iron oxide layer, oxidation iron plate form the 4th layer of printing medium jointly;
Adopt the moulding process of aforementioned 4th layer of printing medium bottom-up formation successively the 3rd layer of printing medium, the second layer of printing medium and first layer of printing medium in the 4th layer of printing medium, and in the first layer of printing medium and the 3rd layer of printing medium forming through hole, the first layer of printing medium and the second layer of printing medium, the 3rd layer of printing medium and the 4th layer of printing medium are connected through through hole with circuit respectively simultaneously;
Lower body layer and shaping four layers of layer of printing medium are thereon taken out, the first layer of printing medium places body layer;
By two-layer body layer with place four layers of layer of printing medium therebetween as a whole, carry out vacuum packaging;
Packaged entirety is put into hydraulic pressure bag, uses hydraulic pamp to pressurize to described hydraulic pressure bag, utilize the hydraulic pressure in hydraulic pressure bag to carry out pressing to described entirety;
Entirety complete for pressing is taken out from described hydraulic pressure bag, removes outside packaging, and required size is formed to described entirety cutting, do not destroy internal structure simultaneously;
Entirety after cutting is put into zirconia saggar inside and carries out high temperature sintering;
Outside described electrode, be coated with silver layer, and on silver layer plating carry out anti-oxidant treatment, namely form common-mode filter.
As a further improvement on the present invention, described sintering temperature is 800-900 DEG C.
As a further improvement on the present invention, described circuit is silver circuit.
As a further improvement on the present invention, described container bottom range hydraulic pressure is 3000-5000psi.
As a further improvement on the present invention, be nickel or tin at electrode place plating.
The invention has the beneficial effects as follows: common-mode filter of the present invention and manufacture method thereof, utilize silver powder to make circuit, electric conductivity is more excellent; Utilize printing machine to be printed in layer of printing medium by silver circuit, avoid and circuit is set in addition causes common-mode filter pressing problem loosely; Utilize hydraulic pressure by common-mode filter pressing and forming, make described common-mode filter surrounding pressurized even, pressing is effective, and can carry out pressing to the common-mode filter of small volume; The common-mode filter of such production, volume is little, with low cost, and good wave filtering effect.
Accompanying drawing explanation
Fig. 1 is common-mode filter decomposing schematic representation of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, common-mode filter 100 of the present invention comprises body layer and layer of printing medium, and described layer of printing medium printing forms silver circuit 7.
Described body layer is two-layer, is upper body layer 1 and lower body layer 2, and described body layer is the rectangular configuration using iron oxide material tape lamination to be formed.
The material selection high permeability of described body layer, the magnetic material of high-dielectric coefficient, as iron oxide etc., can the common mode interference signal of filtering tens MHz or more high band, the nonmagnetic substance of low permeability, low-k selected by the main material of described layer of printing medium, as pottery etc., can the common mode interference signal of below filtering 1MHz or hundreds of kHz.Like this be arranged so that described common-mode filter 100 can the interference signal of simultaneously filtering out high-frequency and low frequency.
Described layer of printing medium is four layers, is respectively the first layer of printing medium 3, second layer of printing medium 4, the 3rd layer of printing medium 5 and the 4th layer of printing medium 6, four layers of described layer of printing medium from top to bottom and is located between two-layer described body layer.
Every layer of layer of printing medium is equipped with the edge formation electrode 10 exporting to described layer of printing medium from described silver circuit 7, every layer of layer of printing medium is provided with an electrode 10.
Described first layer of printing medium 3 is provided with through hole, silver circuit 7 in described first layer of printing medium 3 is connected with the silver circuit 7 in described second layer of printing medium 4 through described through hole, described 3rd layer of printing medium 5 is provided with through hole, and the silver circuit 7 in described 3rd layer of printing medium 5 is connected with the silver circuit 7 in described 4th layer of printing medium 6 through described through hole.So arrange and form non-interfering two loops, more High frequency filter effect can be reached.
Described layer of printing medium be insulating material to prevent from being conducted between the silver circuit 7 in each layer of printing medium, in the present embodiment, the material of described layer of printing medium comprises iron oxide and pottery.
Also comprise stopping the oxidation iron plate 8 of noise in the middle part of the figure that the silver circuit 7 of described every layer of layer of printing medium surrounds.
The rectangular shape of described common-mode filter 100 is arranged, described common-mode filter 100 length range is 1.15-1.35mm, width range is 0.9-1.1mm, altitude range is 0.5-0.7mm, described common-mode filter 100 is of a size of the half of existing common-mode filter size, can meet the requirement of existing precision equipment to common-mode filter size.But the existing production requirement utilizing the process of pressing machine pressing to be difficult to meet undersized like this common-mode filter 100, therefore the present invention also provides the production method of this kind of common-mode filter 100.
The manufacture method of common-mode filter 100 of the present invention mainly comprises following step:
Brown iron oxide and pottery are provided;
Partial oxidation iron powder is made some material strips, all the other brown iron oxides and ceramic are made iron oxide slurry and ceramic size respectively;
Use pressing machine that some material strip laminations are formed body layer, described body layer comprises the upper body layer 1 and lower body layer 2 that are formed as common-mode filter about 100 both sides respectively;
Lower main body 2 layers is fixedly fitted in machine table;
Utilize printing machine that ceramic size is printed out ceramic layer on lower body layer 2, the relative both sides of ceramic layer print out elongated iron oxide layer 9, oxidation iron plate 8 is printed out in the middle part of ceramic layer, and print out silver circuit 7 around oxidation iron plate 8, described circuit exports to described ceramic layer edge and forms electrode 10, described ceramic layer, iron oxide layer 9, oxidation iron plate 8 is composition the 4th layer of printing medium 6 jointly, oxidation iron plate 8 is set at the middle part of ceramic layer, iron oxide layer 9 is set in the both sides of ceramic layer and can plays the effect increasing resistance, improve the filter effect of common-mode filter 100,
Adopt the moulding process of aforementioned 4th layer of printing medium bottom-up formation successively the 3rd layer of printing medium 5, second layer of printing medium 4 and first layer of printing medium 3 in the 4th layer of printing medium, forming through hole in the first layer of printing medium 3 and the 3rd layer of printing medium 5, first layer of printing medium 3 and the second layer of printing medium 4, the 3rd layer of printing medium and the 4th layer of printing medium be connected through through hole with circuit 7 respectively, it is silver-colored preferably that the material of described circuit 7 comprises conductivity simultaneously.Adopt directly to be printed in described layer of printing medium by silver and form silver circuit 7, be better than the existing coil that is etched into by copper and be then pressed together in layer of printing medium, the latter to make between layer of printing medium pressing loosely and easily waste material;
Lower body layer and four layers of layer of printing medium being placed on it are taken out, the first layer of printing medium is placed another layer main body layer;
By two-layer body layer with place four layers of layer of printing medium therebetween as a whole, carry out vacuum packaging;
Because the size of common-mode filter 100 of the present invention is less, existing pressing machine is difficult to carry out pressing to such common-mode filter 100 entirety, therefore the present invention adopts hydraulic pressure mode, packaged entirety is put into hydraulic pressure bag, hydraulic pamp is used to pressurize to described hydraulic pressure bag, the hydraulic pressure in hydraulic pressure bag is utilized to carry out pressing to described entirety, described container bottom range hydraulic pressure is 3000-5000psi, described entirety pressurized in hydraulic pressure bag is balanced, pressing effect is better, and described hydraulic pressure can adjust according to actual needs;
Described entirety is taken out from described hydraulic pressure bag, removes outside packaging, and required size is formed to described entirety cutting, do not destroy internal structure simultaneously;
Entirety after cutting is put into zirconia saggar inside and carries out high temperature sintering, described sintering temperature is 800-900 DEG C, and sintering time is 2-3 hour, and the product surface like this after sintering is smooth, not easy to crack;
Outside electrode 10, be coated with silver layer, and on silver layer plating carry out anti-oxidant treatment, institute's plating is nickel or tin, and nickel and the harm of tin to human body are less than the plumbous harm to human body in prior art;
Obtain common-mode filter 100 after carrying out above-mentioned processing method, Function detection and outward appearance confirmation are carried out to described common-mode filter 100;
Function after testing and outward appearance common-mode filter 100 up to standard are packed.
Common-mode filter 100 of the present invention, printing machine is utilized directly in described layer of printing medium, to print out silver circuit 7 on the one hand, solve the circuit that etches in addition in existing technique and layer of printing medium pressing loosely, make the problem producing gap between layer of printing medium, and can material be saved; On the other hand, utilize silver to make circuit 7, strengthen the conductivity of circuit 7; Again on the one hand, utilize the mode of hydraulic pressure pressing, pressing is carried out to the entirety that body layer and layer of printing medium are formed, solves the problem that existing pressing machine is difficult to carry out small size common-mode filter pressing; Common-mode filter 100 of the present invention, size is only the half of the size of existing common-mode filter 100, can meet the dimensional requirement of miniature precision equipment to common-mode filter 100, and cost is low, makes simple, good wave filtering effect.
Above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not depart from the spirit and scope of technical solution of the present invention.
Claims (10)
1. a common-mode filter, comprise layer of printing medium and body layer, it is characterized in that: in described layer of printing medium, printing forms silver circuit, described body layer has two-layer, described layer of printing medium has four layers, and four layers of described layer of printing medium are located between two-layer described body layer, described body layer is the rectangular configuration using iron oxide material tape lamination to be formed, described layer of printing medium is respectively the first layer of printing medium from top to bottom, second layer of printing medium, 3rd layer of printing medium and the 4th layer of printing medium, described first layer of printing medium is provided with through hole, silver circuit in described first layer of printing medium is through the silver connection on described through hole and described second layer of printing medium, described 3rd layer of printing medium is provided with through hole, silver circuit in described 3rd layer of printing medium is through the silver connection on described through hole and described 4th layer of printing medium.
2. common-mode filter according to claim 1, is characterized in that: every layer of layer of printing medium is equipped with the electrode exporting to described layer of printing medium edge from silver circuit.
3. common-mode filter according to claim 2, is characterized in that: described common-mode filter is that square type is arranged, and described common-mode filter length range is 1.15-1.35mm, and width range is 0.9-1.1mm, and altitude range is 0.5-0.7mm.
4. common-mode filter according to claim 3, is characterized in that: the material of described layer of printing medium is that insulating material is conducted to prevent the silver circuit in each layer of printing medium.
5. common-mode filter according to claim 4, is characterized in that: the oxidation iron plate being provided with to increase resistance in the middle part of the figure that the silver circuit of described every layer of layer of printing medium surrounds.
6. a manufacture method for common-mode filter, is characterized in that: the manufacture method of described common-mode filter mainly comprises the following steps:
Brown iron oxide and pottery are provided;
Partial oxidation iron powder is made some material strips, all the other brown iron oxides and pottery are made iron oxide slurry and ceramic size respectively;
Use pressing machine that some material strip laminations are formed body layer, described body layer comprises the upper body layer and lower body layer that are formed as the upper and lower both sides of common-mode filter respectively;
Lower body layer is fixedly fitted in machine table;
Utilize printing machine that ceramic size is printed out ceramic layer on lower body layer, the relative both sides of ceramic layer print out elongated iron oxide layer, print out oxidation iron plate in the middle part of ceramic layer and print out circuit around oxidation iron plate, described circuit exports to described ceramic layer edge and forms electrode, and described ceramic layer, iron oxide layer, oxidation iron plate form the 4th layer of printing medium jointly;
Adopt the moulding process of aforementioned 4th layer of printing medium bottom-up formation successively the 3rd layer of printing medium, the second layer of printing medium and first layer of printing medium in the 4th layer of printing medium, and in the first layer of printing medium and the 3rd layer of printing medium forming through hole, the first layer of printing medium and the second layer of printing medium, the 3rd layer of printing medium and the 4th layer of printing medium are connected through through hole with circuit respectively simultaneously;
Lower body layer and shaping four layers of layer of printing medium are thereon taken out, the first layer of printing medium places body layer;
By two-layer body layer with place four layers of layer of printing medium therebetween as a whole, carry out vacuum packaging;
Packaged entirety is put into hydraulic pressure bag, uses hydraulic pamp to pressurize to described hydraulic pressure bag, utilize the hydraulic pressure in hydraulic pressure bag to carry out pressing to described entirety;
Entirety complete for pressing is taken out from described hydraulic pressure bag, removes outside packaging, and required size is formed to described entirety cutting, do not destroy internal structure simultaneously;
Entirety after cutting is put into zirconia saggar inside and carries out high temperature sintering;
Outside described electrode, be coated with silver layer, and on silver layer plating carry out anti-oxidant treatment, namely form common-mode filter.
7. the manufacture method of common-mode filter according to claim 6, is characterized in that: described sintering temperature is 800-900 DEG C.
8. the manufacture method of common-mode filter according to claim 6, is characterized in that: described circuit is silver circuit.
9. the manufacture method of common-mode filter according to claim 6, is characterized in that: described container bottom range hydraulic pressure is 3000-5000psi.
10. the manufacture method of common-mode filter according to claim 6, is characterized in that: be nickel or tin at electrode place plating.
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| CN201510578516.9A CN105098300A (en) | 2015-09-11 | 2015-09-11 | Common-mode filter and manufacturing method therefor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114122656A (en) * | 2020-08-31 | 2022-03-01 | 台湾禾邦电子有限公司 | Electronic device, waveguide structure thereof, and fabrication method thereof |
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| CN102362320A (en) * | 2009-03-26 | 2012-02-22 | 株式会社村田制作所 | Electronic part and manufacturing method therefor |
| CN102693835A (en) * | 2011-03-24 | 2012-09-26 | 株式会社村田制作所 | Electronic component |
| CN103814419A (en) * | 2011-09-15 | 2014-05-21 | 松下电器产业株式会社 | Common mode noise filter and its manufacturing method |
| CN103247441A (en) * | 2012-02-13 | 2013-08-14 | 株式会社村田制作所 | Method of manufacturing multilayer ceramic capacitor and multilayer ceramic capacitor |
| CN102617155A (en) * | 2012-04-16 | 2012-08-01 | 深圳顺络电子股份有限公司 | Method for manufacturing inductance porcelain core substrate |
| CN104779034A (en) * | 2015-04-20 | 2015-07-15 | 禾邦电子（中国）有限公司 | Common-mode filter and manufacturing method thereof |
| CN204905388U (en) * | 2015-09-11 | 2015-12-23 | 禾邦电子（中国）有限公司 | Common mode wave filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114122656A (en) * | 2020-08-31 | 2022-03-01 | 台湾禾邦电子有限公司 | Electronic device, waveguide structure thereof, and fabrication method thereof |
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