CN102238803A - Printed circuit board and common-mode filter thereof - Google Patents
Printed circuit board and common-mode filter thereof Download PDFInfo
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- CN102238803A CN102238803A CN2010101645903A CN201010164590A CN102238803A CN 102238803 A CN102238803 A CN 102238803A CN 2010101645903 A CN2010101645903 A CN 2010101645903A CN 201010164590 A CN201010164590 A CN 201010164590A CN 102238803 A CN102238803 A CN 102238803A
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- transmission lines
- circuit board
- printed circuit
- mode filter
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Abstract
The invention relates to a printed circuit board, which comprises a signal layer and a grounding layer close to the signal layer; a pair of difference transmission lines is arranged on the signal layer; a common-mode filter is arranged on the grounding layer and comprises two filtering parts positioned on the two sides of the difference transmission lines projected on the grounding layer; each filtering part is formed by connecting a plurality of mutually-parallel strip copper foils in an end-to-end manner at intervals; and a hollow area on the two filtering parts is communicated with a strip hollow area. The common-mode filter is applied to the printed circuit board, and a common-mode signal running through the difference transmission lines can be effectively filtered out.
Description
Technical field
The present invention relates to a kind of printed circuit board (PCB) and common-mode filter thereof.
Background technology
At present; USB interface has been the standard configuration interface of computer equipment; USB interface is to link to each other with USB controller on the computer main frame panel by differential signal line; transmit on the differential signal line between USB interface and the USB controller in order to prevent common-mode noise; usually can on the differential signal line between USB interface and the USB controller, common-mode filter be set; though described common-mode filter can carry out filtering to the common-mode signal on the differential signal line; but described common-mode filter has occupied the wiring space of computer main frame panel, and has improved the cost of computer main frame panel.
Summary of the invention
In view of foregoing, be necessary to provide a kind of by transforming printed circuit board (PCB) and the common-mode filter thereof that the printed circuit board (PCB) self structure can realize common-mode filter.
A kind of printed circuit board (PCB), the ground plane that comprises a signals layer and the described signals layer of a next-door neighbour, described signals layer is provided with a pair of difference transmission lines, described ground plane is provided with a common-mode filter, described common-mode filter comprises that two lay respectively at the filtering portion of the both sides of described difference transmission lines projection on described ground plane, each filtering portion is alternately joined to arranging by some bar shaped Copper Foils that are parallel to each other to forming from beginning to end, and the area of knockout in the described two filtering portions also is communicated with by a bar shaped area of knockout.
A kind of common-mode filter, be used for the common-mode signal that a pair of difference transmission lines transmits on the filtering one printed circuit board signal layer, described common-mode filter is the some of the ground plane of the described signals layer of next-door neighbour in the described printed circuit board (PCB), described common-mode filter comprises that two lay respectively at the filtering portion of the both sides of described difference transmission lines projection on described ground plane, each filtering portion is alternately joined to arranging by some bar shaped Copper Foils that are parallel to each other to forming from beginning to end, and the area of knockout in the described two filtering portions also is communicated with by a bar shaped area of knockout.
Compare prior art, common-mode filter on the described printed circuit board (PCB) is to handle formation by the ground plane on the described printed circuit board (PCB) being carried out specific hollowing out, so the common-mode filter of entity need not be installed, can save cost greatly, also can save the wiring space of printed circuit board (PCB).
Description of drawings
In conjunction with better embodiment the present invention is described in further detail with reference to the accompanying drawings:
Fig. 1 is the exploded view of printed circuit board (PCB) better embodiment of the present invention.
Fig. 2 is the constitutional diagram of Fig. 1.
The comparison chart of the pairing input loss curve of penetrating coefficient when Fig. 3 is online differential signal of the differential transfer of printed circuit board (PCB) among Fig. 1 and common-mode signal transmission.
The main element symbol description
Printed circuit board (PCB) 100
Difference transmission lines 112,114
Common-mode filter 121
Filtering portion 122,124
Bar shaped area of knockout 126
Embodiment
Please refer to Fig. 1 and Fig. 2, the better embodiment of printed circuit board (PCB) 100 of the present invention comprises the ground plane 120 of a signals layer 110 and the described signals layer 110 of a next-door neighbour, described signals layer 110 is provided with a pair of difference transmission lines 112 and 114, described difference transmission lines 112 and 114 is used for transmitting differential signal, as transmitting the signal between USB interface and the USB controller.Described printed circuit board (PCB) 100 may also comprise other layer, as bus plane etc., because the present invention does not relate to the structure of other layer, so other layer specific descriptions no longer.
Transmit on described difference transmission lines 112 and 114 for suppressing common-mode signal, the present invention has carried out structural improvement to described ground plane 120, be about to described ground plane 120 and hollow out processing, so that form a common-mode filter 121 on the ground plane 120 through hollowing out processing at ad-hoc location.Described common-mode filter 121 comprises two filtering portions 122 and 124, and the area of knockout in the described two filtering portions 122 and 124 also is connected by a bar shaped area of knockout 126.
Particularly, described two filtering portions 122 and 124 lay respectively at the both sides of described difference transmission lines 112 and 114 projections on described ground plane 120, described two filtering portions 122 and 124 outline all are roughly rectangle and long limit is parallel to described difference transmission lines 112 and 114, described two filtering portions 122 and 124 hollow out to handle remaining specific region, back on ground plane 120, and promptly hollowing out after the processing all is alternately to be joined from beginning to end to arranging by some bar shaped Copper Foils that are parallel to each other to forming.In the present embodiment, described bar shaped area of knockout 126 is a bar shaped area of knockout perpendicular to described difference transmission lines 112 and 114.For common-mode signal, because of the common-mode filter on the ground plane 120 121 is by hollowing out some bar shaped copper foil structures that are parallel to each other and alternately join from beginning to end that ground plane 120 forms, so can produce the parallel resonance of inductance and electric capacity, and then make common-mode signal be difficult for flowing through from described difference transmission lines 112 and 114.
Please refer to Fig. 3, the pairing input loss curve of penetrating coefficient when on behalf of differential signal, curve A transmit on described difference transmission lines 112 and 114, as can be seen the input loss during differential signal transmission seldom, even frequency has reached 25GHz, input loss is also seldom.The pairing input loss curve of penetrating coefficient when on behalf of common-mode signal, curve B then transmit on described difference transmission lines 112 and 114, input loss when common-mode signal is transmitted as can be seen is a lot, the energy that promptly is depleted is by described common-mode filter 121 filterings, especially when frequency was roughly 8.8GHz, the effect of filtering was the most remarkable.On recording printed circuit board (PCB) 100 in advance during the frequency of common-mode signal, parameters such as quantity that can be by adjusting bar shaped Copper Foil on described two filtering portions 122 and 124, distance, width, length are come the corresponding the most significant frequency range of filter action of adjusting, so that filtering common-mode signal to the full extent, the parameter such as quantity, distance, width, length of wherein adjusting strip plate body on described two filtering portions 122 and 124 is that emulation draws optimum value by experiment.
Printed circuit board (PCB) 100 of the present invention is not owing to install the common-mode filter of entity on described difference transmission lines 112 and 114, but form described common-mode filter 121 by the structure of change ground plane 120, so can save cost greatly, also can save the wiring space of printed circuit board (PCB) 100.
Claims (7)
1. printed circuit board (PCB), the ground plane that comprises a signals layer and the described signals layer of a next-door neighbour, described signals layer is provided with a pair of difference transmission lines, described ground plane is provided with a common-mode filter, described common-mode filter comprises that two lay respectively at the filtering portion of the both sides of described difference transmission lines projection on described ground plane, each filtering portion is alternately joined to arranging by some bar shaped Copper Foils that are parallel to each other to forming from beginning to end, and the area of knockout in the described two filtering portions also is communicated with by a bar shaped area of knockout.
2. printed circuit board (PCB) as claimed in claim 1 is characterized in that: the outline of described two filtering portions all is roughly rectangle, and long limit is parallel to described difference transmission lines.
3. printed circuit board (PCB) as claimed in claim 1 is characterized in that: described bar shaped area of knockout is a bar shaped area of knockout perpendicular to described difference transmission lines.
4. printed circuit board (PCB) as claimed in claim 1 is characterized in that: described difference transmission lines is used to transmit the differential signal that transmits between USB interface and the USB controller.
5. common-mode filter, be used for the common-mode signal that a pair of difference transmission lines transmits on the filtering one printed circuit board signal layer, described common-mode filter is the some of the ground plane of the described signals layer of next-door neighbour in the described printed circuit board (PCB), described common-mode filter comprises that two lay respectively at the filtering portion of the both sides of described difference transmission lines projection on described ground plane, each filtering portion is alternately joined to arranging by some bar shaped Copper Foils that are parallel to each other to forming from beginning to end, and the area of knockout in the described two filtering portions also is communicated with by a bar shaped area of knockout.
6. common-mode filter as claimed in claim 5 is characterized in that: the outline of described two filtering portions all is roughly rectangle, and long limit is parallel to described difference transmission lines.
7. common-mode filter as claimed in claim 5 is characterized in that: described bar shaped area of knockout is a bar shaped area of knockout perpendicular to described difference transmission lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101645903A CN102238803A (en) | 2010-05-06 | 2010-05-06 | Printed circuit board and common-mode filter thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101645903A CN102238803A (en) | 2010-05-06 | 2010-05-06 | Printed circuit board and common-mode filter thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102238803A true CN102238803A (en) | 2011-11-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101645903A Pending CN102238803A (en) | 2010-05-06 | 2010-05-06 | Printed circuit board and common-mode filter thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN102238803A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378908A (en) * | 2013-08-12 | 2015-02-25 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board |
| CN105450195A (en) * | 2014-09-30 | 2016-03-30 | 纬创资通股份有限公司 | Common mode filter |
| CN106068058A (en) * | 2016-06-28 | 2016-11-02 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted Ethernet circuit wiring method |
| CN107333383A (en) * | 2016-04-29 | 2017-11-07 | 鸿富锦精密电子(天津)有限公司 | Printed circuit board |
| CN109842989A (en) * | 2017-11-24 | 2019-06-04 | 广达电脑股份有限公司 | High speed circuit and its high-speed-differential cable architecture |
| CN111653853A (en) * | 2020-06-11 | 2020-09-11 | 浙江大学 | Sawtooth type stripline common mode filter circuit without through holes |
| CN115023026A (en) * | 2021-10-27 | 2022-09-06 | 荣耀终端有限公司 | Circuit board and electronic device |
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| US20070052502A1 (en) * | 2005-09-06 | 2007-03-08 | Ntt Docomo, Inc. | Coplanar resonator and filter using the same |
| US20100052820A1 (en) * | 2008-08-29 | 2010-03-04 | National Taiwan University | Common mode filtering method and device |
| US20100073109A1 (en) * | 2008-09-24 | 2010-03-25 | Tsan-Chou Wu | Filtering Device and Related Wireless Communication Receiver |
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2010
- 2010-05-06 CN CN2010101645903A patent/CN102238803A/en active Pending
Patent Citations (3)
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| US20070052502A1 (en) * | 2005-09-06 | 2007-03-08 | Ntt Docomo, Inc. | Coplanar resonator and filter using the same |
| US20100052820A1 (en) * | 2008-08-29 | 2010-03-04 | National Taiwan University | Common mode filtering method and device |
| US20100073109A1 (en) * | 2008-09-24 | 2010-03-25 | Tsan-Chou Wu | Filtering Device and Related Wireless Communication Receiver |
Non-Patent Citations (3)
| Title |
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| BOUTEJDAR等: "New Low-Pass Filter Design Using Compensated Microstrip Cpacitor and Coupled Meander Defected Ground Structure(DGS)", 《GERMAN MICROWAVE CONFERENCE》 * |
| WEI-TZONG LIU等: "An Embedded Common-Mode Suppression Filter for GHz Differential Signals Using Periodic Defeted Ground Plane", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
| WU等: "A Novel HU-shaped Common-mode Filter for GHz Differential Signals", 《IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378908B (en) * | 2013-08-12 | 2017-06-16 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board (PCB) |
| CN104378908A (en) * | 2013-08-12 | 2015-02-25 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board |
| CN105450195A (en) * | 2014-09-30 | 2016-03-30 | 纬创资通股份有限公司 | Common mode filter |
| CN105450195B (en) * | 2014-09-30 | 2018-01-09 | 纬创资通股份有限公司 | Common mode filter |
| CN107333383A (en) * | 2016-04-29 | 2017-11-07 | 鸿富锦精密电子(天津)有限公司 | Printed circuit board |
| CN107333383B (en) * | 2016-04-29 | 2019-08-30 | 鸿富锦精密电子(天津)有限公司 | Printed circuit board |
| CN106068058B (en) * | 2016-06-28 | 2019-10-25 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted ethernet circuit wiring method |
| CN106068058A (en) * | 2016-06-28 | 2016-11-02 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted Ethernet circuit wiring method |
| CN109842989A (en) * | 2017-11-24 | 2019-06-04 | 广达电脑股份有限公司 | High speed circuit and its high-speed-differential cable architecture |
| CN111653853A (en) * | 2020-06-11 | 2020-09-11 | 浙江大学 | Sawtooth type stripline common mode filter circuit without through holes |
| CN115023026A (en) * | 2021-10-27 | 2022-09-06 | 荣耀终端有限公司 | Circuit board and electronic device |
| WO2023071545A1 (en) * | 2021-10-27 | 2023-05-04 | 荣耀终端有限公司 | Circuit board and electronic device |
| EP4199661A4 (en) * | 2021-10-27 | 2024-03-13 | Honor Device Co., Ltd. | Circuit board and electronic device |
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Application publication date: 20111109 |
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