CN103219963A - Common mode filter based on C type coupling defected ground structure - Google Patents
Common mode filter based on C type coupling defected ground structure Download PDFInfo
- Publication number
- CN103219963A CN103219963A CN2013101312152A CN201310131215A CN103219963A CN 103219963 A CN103219963 A CN 103219963A CN 2013101312152 A CN2013101312152 A CN 2013101312152A CN 201310131215 A CN201310131215 A CN 201310131215A CN 103219963 A CN103219963 A CN 103219963A
- Authority
- CN
- China
- Prior art keywords
- mode filter
- common
- ground structure
- filter based
- type coupling
- 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.)
- Pending
Links
Images
Abstract
The invention discloses a common mode filter based on a C type coupling defected ground structure. A coupled microstrip line used for transferring high-speed differential signals is manufactured on the top surface of a double-layer printed circuit board. The bottom surface of the circuit board is coated with copper to be used as a ground player. Two C type grooves are symmetrically etched on a ground plane right under the coupled microstrip line; namely, the grooves are of a defected ground structure. Directions of openings of the two C type grooves are opposite. The common mode filter based on the C type coupling defected ground structure is simple in design, few in structure parameters and small in effective electricity size.
Description
Technical field
The invention belongs to high speed circuit, Electromagnetic Field and Microwave Technology field, specifically is a common-mode filter based on C type coupling defect ground structure, can be used to suppress the common-mode noise of ghz band on the high speed circuit differential lines.
Background technology
Along with the raising of high-velocity electrons system to the transfer of data reliability requirement, differential signal is being played the part of more and more important role, main cause be differential signal to outside insensitive for noise, have low crosstalking and characteristics such as low electromagnetic.For example: many high speed serialization link standards (PCI-Express 2.0, and USB 3.0, SATA III etc.) have all realized the differential signal transmission of super 5Gbps.Yet,, can introduce common-mode noise inevitably owing to the shake of differential signal in the side circuit, the inconsistency of differential signal rising/trailing edge and the reasons such as restriction of differential signal path wiring.The common-mode noise of GHz can have a strong impact on the signal integrity and the power supply integrality of high speed circuit system.In addition, in many high speed circuit system applies, different electronic devices connect by cable usually, and common-mode noise will be coupled on the cable like this, thereby causes electromagnetic interference problem.Therefore, on the basis that guarantees the high-speed differential signal high-quality transmission, effectively suppress common-mode noise and in the high speed circuit design, seem particularly important.
Aspect the common-mode noise inhibition of high-speed differential signal, scholar both domestic and external had done some correlative studys.It is the most common wherein to use high magnetic conductivity ferrite to make common mode choke, but this method can only be applied to the megahertz frequency range, and volume is bigger, is unfavorable for the miniaturization of electronic system.Therefore, the Wu Zonglin of Taiwan Univ. professor's research group utilizes mushroom construction to make the common-mode filter of a broadband and miniaturization based on LTCC (LTCC) technology, realized 3.8GHz to 7.1GHz common-mode noise-10dB suppresses.Because the manufacturing cost of LTCC is higher, people such as professor Wu Zonglin utilize cycle dumbbell shape defect ground structure and coupling HU type defect ground structure to design two common-mode filter based on printed circuit board technology with low cost, technical maturity again.Compare these two kinds of defect ground structures, coupling HU type defect ground structure more can reduce the electric size of common-mode filter, increases bandwidth, but because design parameter is too much, causes design difficulty to increase.
Summary of the invention
The object of the present invention is to provide a kind of common-mode filter, can be used to suppress the common-mode noise of ghz band on the high speed circuit differential lines based on C type coupling defect ground structure.
The technical solution that realizes the object of the invention is: a kind of common-mode filter based on C type coupling defect ground structure comprises ground plane, dielectric layer, top layer wiring layer, coupled microstrip line and C type groove; The upper surface of dielectric layer covers the top layer wiring layer, and lower surface covers ground plane, prints coupled microstrip line on the top layer wiring layer, the relative C type groove of two opening directions of etching on the ground plane.
Described C type groove is a symmetry axis with the central axis of coupled microstrip line, be etched in symmetrically coupled microstrip line under on the ground plane.
There is spacing between the relative C type groove of described two opening directions.
The material of dielectric layer is FR4, Roger R03003, Roger R04003 or RogerRT/duroid 5870 media.
The present invention compared with prior art, its remarkable advantage: (1) common-mode filter structural design of the present invention is simple, and structural parameters are less relatively; (2) the effective electric size of common-mode filter is less.
Description of drawings
Shown in Figure 1 is the common-mode filter stereogram that proposes according to the present invention based on C type coupling defect ground structure.
Shown in Figure 2 is the common-mode filter frequency domain performance that emulation obtains according to the present invention, and figure (a) is the S parameter of differential signal and common-mode noise, and figure (b) is the differential signal group delay.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is elaborated.
The present invention makes coupled microstrip line at the end face of double-layer printing circuit board and is used for the transmitting high speed differential signal, copper is covered in the bottom surface of circuit board, as ground plane, central axis with coupled microstrip line on ground level under the coupled microstrip line is the symmetry axis groove defect ground structure of two C types of etching symmetrically, and the opening direction of two C type grooves is (as shown in Figure 1) relatively.Two of etching relative C type grooves of opening direction are emphasis of the present invention on the ground level, also are the innovation parts.Utilize C type defective ground to produce LC parallel resonance stopband, and the bandwidth of rejection of utilizing two coupling broadening common-mode noises between the C type defective ground LC antiresonant circuit to suppress.
Embodiment: is 2.3GHz-6.1GHz in conjunction with Fig. 1 and Fig. 2 with common-mode noise-10dB inhibition stop-band frequency scope, the common-mode filter (its differential signal group delay introduce before and after the C type coupling defect ground structure constant substantially in common-mode noise suppresses stopband) of C type coupling defect ground structure be example, the embodiment of detailed description structure of the present invention.
All cover the relative C type groove 5 of two opening directions of etching on the basis of copper at 2 layer printed circuit board ground planes 1 by following parameter, the groove width of C type groove
w s =1mm, the groove arm is respectively as shown in Figure 1
L 1 =10mm,
L 2 =6mm,
L 3 =4mm, the spacing of two C type grooves
g=0.5mm.Print coupled microstrip line 4 on circuit board top layer wiring layer 3, the live width and the line-spacing of coupled microstrip line are respectively
w m =0.545mm and
s m =0.36mm.Dielectric layer 2 adopts the FR4 medium, and relative dielectric constant is 4.4, and the loss angle tangent of medium is 0.02, and thickness is
h=0.4mm.Compared with prior art, its advantage is simple in structure, and design parameter is few, and the effective electric size of filter is less.
Claims (4)
1. the common-mode filter based on C type coupling defect ground structure is characterized in that: comprise ground plane [1], dielectric layer [2], top layer wiring layer [3], coupled microstrip line [4] and C type groove [5]; The upper surface of dielectric layer [2] covers top layer wiring layer [3], and lower surface covers ground plane [1], and top layer wiring layer [3] is gone up and printed coupled microstrip line [4], and ground plane [1] is gone up the relative C type groove [5] of two opening directions of etching.
2. the common-mode filter based on C type coupling defect ground structure according to claim 1, it is characterized in that: described C type groove [5] is a symmetry axis with the central axis of coupled microstrip line [4], be etched in symmetrically coupled microstrip line [4] under on the ground plane [1].
3. the common-mode filter based on C type coupling defect ground structure according to claim 1 is characterized in that: have spacing between the relative C type groove [5] of described two opening directions.
4. the common-mode filter based on C type coupling defect ground structure according to claim 1, it is characterized in that: the material of described dielectric layer [2] is FR4, Roger R03003, Roger R04003 or RogerRT/duroid 5870 media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101312152A CN103219963A (en) | 2013-04-16 | 2013-04-16 | Common mode filter based on C type coupling defected ground structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101312152A CN103219963A (en) | 2013-04-16 | 2013-04-16 | Common mode filter based on C type coupling defected ground structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103219963A true CN103219963A (en) | 2013-07-24 |
Family
ID=48817512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101312152A Pending CN103219963A (en) | 2013-04-16 | 2013-04-16 | Common mode filter based on C type coupling defected ground structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103219963A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883151A (en) * | 2015-05-19 | 2015-09-02 | 北京中科飞鸿科技有限公司 | Micro ultra-wide-band band-pass LC filter |
| CN105228334A (en) * | 2015-08-26 | 2016-01-06 | 昆山龙腾光电有限公司 | A kind of printed circuit board (PCB) |
| CN105680126A (en) * | 2015-12-30 | 2016-06-15 | 联想(北京)有限公司 | Filter adjustment method, filter and electronic equipment |
| CN106255307A (en) * | 2015-06-14 | 2016-12-21 | 鸿富锦精密工业(武汉)有限公司 | Circuit board |
| CN106450606A (en) * | 2016-12-21 | 2017-02-22 | 广西科技大学鹿山学院 | Ultra-wideband limiting filter based on left-handed material |
| US9997817B2 (en) | 2015-12-30 | 2018-06-12 | Lenovo (Beijing) Limited | Filter and electronic device |
| 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 |
| CN110190367A (en) * | 2019-05-23 | 2019-08-30 | 复旦大学 | A kind of ultra wide band differential lines common-mode noise filter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354790A (en) * | 2011-10-25 | 2012-02-15 | 电子科技大学 | Highly miniaturized substrate integrated waveguide resonator |
| WO2013022250A2 (en) * | 2011-08-05 | 2013-02-14 | 주식회사 케이엠더블유 | Radio frequency filter employing notch structure |
-
2013
- 2013-04-16 CN CN2013101312152A patent/CN103219963A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013022250A2 (en) * | 2011-08-05 | 2013-02-14 | 주식회사 케이엠더블유 | Radio frequency filter employing notch structure |
| CN102354790A (en) * | 2011-10-25 | 2012-02-15 | 电子科技大学 | Highly miniaturized substrate integrated waveguide resonator |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883151A (en) * | 2015-05-19 | 2015-09-02 | 北京中科飞鸿科技有限公司 | Micro ultra-wide-band band-pass LC filter |
| CN104883151B (en) * | 2015-05-19 | 2018-10-02 | 北京中科飞鸿科技有限公司 | A kind of miniature ultrabroad band band logical LC filters |
| CN106255307A (en) * | 2015-06-14 | 2016-12-21 | 鸿富锦精密工业(武汉)有限公司 | Circuit board |
| CN105228334A (en) * | 2015-08-26 | 2016-01-06 | 昆山龙腾光电有限公司 | A kind of printed circuit board (PCB) |
| CN105228334B (en) * | 2015-08-26 | 2018-10-02 | 昆山龙腾光电有限公司 | a kind of printed circuit board |
| CN105680126A (en) * | 2015-12-30 | 2016-06-15 | 联想(北京)有限公司 | Filter adjustment method, filter and electronic equipment |
| US9997817B2 (en) | 2015-12-30 | 2018-06-12 | Lenovo (Beijing) Limited | Filter and electronic device |
| CN106450606A (en) * | 2016-12-21 | 2017-02-22 | 广西科技大学鹿山学院 | Ultra-wideband limiting filter based on left-handed material |
| 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 |
| CN109842989B (en) * | 2017-11-24 | 2022-03-29 | 广达电脑股份有限公司 | High-speed circuit and high-speed differential line structure thereof |
| CN110190367A (en) * | 2019-05-23 | 2019-08-30 | 复旦大学 | A kind of ultra wide band differential lines common-mode noise filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103219963A (en) | Common mode filter based on C type coupling defected ground structure | |
| US7932793B2 (en) | Common mode filtering method and device | |
| US8907748B2 (en) | Common-mode suppression filter for microstrip 10-Gb/s differential lines | |
| JP6133884B2 (en) | Printed circuit board with embedded electrical passive element for high frequency transmission | |
| CN110190367B (en) | Ultra-wideband differential line common mode noise filter | |
| US9462679B2 (en) | Attenuation reduction grounding pattern structure for connection pads of flexible circuit board | |
| US8053679B2 (en) | Printed circuit board | |
| TWI478636B (en) | Printed circuit board | |
| CN203340416U (en) | Printed circuit board and terminal | |
| CN102723542A (en) | Ultra-broad stopband microstrip low-pass filter | |
| CN203232942U (en) | UWB band-pass filter with simple structure | |
| EP2897218A1 (en) | Combiner | |
| CN103594761A (en) | Substrate integrated waveguide ferrite switch | |
| JP6202859B2 (en) | Printed circuit board and electronic device | |
| JP2004015534A (en) | Crosstalk suppression member and digital signal transmission line | |
| JP2011096954A (en) | Wiring board | |
| CN108666720A (en) | Miniature ultra wide band common mode noise rejection circuit | |
| CN105430867B (en) | A kind of Dolby circuit for CCD camera | |
| Chuang et al. | A novel ground resonator technique to reduce common-mode radiation on slot-crossing differential signals | |
| CN103606724A (en) | Power device and micro-strip filter thereof | |
| US9331740B2 (en) | Device suppressing common-mode radiation | |
| US7944328B2 (en) | Low-pass filter | |
| JP2012169320A (en) | Printed circuit board | |
| CN203813003U (en) | Compact type microstrip balance filter based on slotted line structure | |
| CN203607519U (en) | Power device and micro-strip filter thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130724 |