CN114245564B - Printed circuit board - Google Patents
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- CN114245564B CN114245564B CN202111442701.7A CN202111442701A CN114245564B CN 114245564 B CN114245564 B CN 114245564B CN 202111442701 A CN202111442701 A CN 202111442701A CN 114245564 B CN114245564 B CN 114245564B
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- 239000002184 metal Substances 0.000 claims abstract description 33
- 230000001629 suppression Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Structure Of Printed Boards (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a printed circuit board, comprising: a preset number of electromagnetic band gap structure regions arranged on the target power supply layerThe method comprises the steps of carrying out a first treatment on the surface of the Each electromagnetic band gap structure region is in a regular hexagon shape, each electromagnetic band gap structure region comprises 6 disjoint regular triangle regions, one side of each regular triangle region is parallel to the corresponding side of the corresponding electromagnetic band gap structure region, the distance between the sides of each regular triangle region is a preset width, and two sides of each regular triangle region in the 6 regular triangle regions are parallel to one side of the nearest regular triangle region; each regular triangle area comprises 3 n The metal areas are provided with metal sheets with electromagnetic band gap structures; compared with the existing square EBG structure, the electromagnetic band gap structure region is arranged, the band width and the band stop depth of noise suppression are more excellent, the signal integrity is improved, and the channel cutting can be directly performed on the power supply layer of the printed circuit board.
Description
Technical Field
The invention relates to the field of PCB design, in particular to a printed circuit board.
Background
At present, scientific and technological products slowly face to the development trend of high speed, small volume, low voltage and the like. With the increasing speed of chips (chips) in high performance servers, the impact of ground bounce noise (Ground Bounce Noise, GBN) on the system is increasingly significant, and it is important to suppress the GBN effect. The Power layer (Power Plane) of the PCB (printed circuit board) and the complete Ground Plane (Ground Plane) form a parallel plate waveguide structure, namely an electromagnetic band Gap structure (Electromagnetic Band-Gap, EBG) by utilizing a PBG (Photonic band Gap) structure, and the EBG structure of the Power Plane is equivalent to a serial LC parallel high-order band reject filter so as to achieve the effect of inhibiting the Ground bounce noise.
The name of electromagnetic bandgap structures was originally developed with high impedance surfaces (High Impedance surface, HIS) and the special feature of this structure is that it effectively blocks surface currents from attenuating electromagnetic waves and not propagating easily. The initial structure is formed by a square metal plate (Patch) plus Via (Via) to ground, the geometry formed by the side-by-side combination is arranged in a periodic manner, and dielectric material is filled between the metal plate and the ground layer. The three-layer structure is changed, so that the structure can generate an omni-directional cut-off frequency band in a specific frequency band to prevent the propagation of electromagnetic waves, and the whole structure is shown in figure 1; as for the way in which this structure can block electromagnetic wave propagation, it can be understood through the lumped element circuit (Lumped Element Circuit) shown in fig. 2, the circuit type formed is an LC parallel circuit,wherein, the capacitance (C) is generated between two metal plates (Patch), and the inductance (L) is generated by the metal plates, the communication column (Via) and the ground layer; when the equivalent circuit generates resonance effect (resonance), the equivalent circuit is a high-impedance propagation path, so that the propagation is not easy; it can be found that it produces a cut-off band for the frequency band of electromagnetic waves, and the center frequency on the cut-off band is the resonance frequency of the equivalent circuit
) I.e.
The method comprises the steps of carrying out a first treatment on the surface of the The application of the structural principle to the PCB can achieve the performance of noise suppression.
At present, the EBG structure applied on the PCB usually adopts a linear channel electromagnetic energy gap (coplaner EBG) structure as shown in fig. 3, and the structure is that only a regular shape is cut on a Power Plane (Power Plane), as shown in fig. 4, a parallel circuit formed by an inductor (L) and a capacitor (C1) has resonance effect under a specific bandwidth, so that the input impedance of the parallel circuit approaches infinity, so that the linear channel is equivalent to a high-impedance propagation path for noise, and the parallel circuit is not easy to be transferred; however, the signal integrity is affected by the hollowing out of the linear channel adopted by the conventional linear channel electromagnetic bandgap structure. Therefore, how to provide a new EBG structure to improve signal integrity is an urgent issue to be resolved nowadays.
Disclosure of Invention
The invention aims to provide a printed circuit board, which is designed by utilizing an embedded triangular EBG structure, so as to improve the signal integrity.
In order to solve the above technical problems, the present invention provides a printed circuit board, comprising: the electromagnetic band gap structure areas are arranged in a preset number of the target power supply layers;
wherein each electromagnetic band gap structure region is regular hexagon, and each electromagnetic band gap structure region comprises 6 disjoint regular trianglesThe electromagnetic band gap structure comprises regions, wherein one side of each regular triangle region is parallel to the corresponding side of the corresponding electromagnetic band gap structure region, the distance between the two sides of each regular triangle region is a preset width, and two sides of each regular triangle region in 6 regular triangle regions in each electromagnetic band gap structure region are parallel to the sides of the nearest regular triangle region; each of the regular triangle areas comprises 3 n Each metal region is in a regular triangle shape, and the side length of each metal region is the side length of the regular triangle region and 2 n Each side of the regular triangle area is provided with 2 n And the metal areas are provided with electromagnetic band gap structure metal sheets, and n is a positive integer greater than or equal to 1.
Optionally, the preset number is a positive integer greater than 1, and adjacent edges of two adjacent electromagnetic band gap structure regions completely coincide.
Alternatively, n is 2.
Optionally, the preset width is 2.
Optionally, the side length of the electromagnetic band gap structure region is 20mm.
Optionally, the side length of the regular triangle area is 16mm.
The invention provides a printed circuit board, comprising: the electromagnetic band gap structure areas are arranged in a preset number of the target power supply layers; each electromagnetic band gap structure region is in a regular hexagon shape, each electromagnetic band gap structure region comprises 6 disjoint regular triangle regions, one side of each regular triangle region is parallel to the corresponding side of the corresponding electromagnetic band gap structure region, the distance between the sides of each regular triangle region is a preset width, and two sides of each regular triangle region in the 6 regular triangle regions are parallel to one side of the nearest regular triangle region; each regular triangle area comprises 3 n Each metal area is in a regular triangle shape, and the side length of each metal area is the side length of the regular triangle area and 2 n Each regular triangle area is provided with 2 on one side n Metal regions, the metal regions are provided with electricityA tape gap structure metal sheet, n is a positive integer greater than or equal to 1;
therefore, the invention changes the existing square EBG structure into the regular hexagon EBG structure through the arrangement of the electromagnetic band gap structure region, compared with the existing square EBG structure, the band width and the band stop depth of noise suppression are more excellent, the signal integrity is improved, and the channel cutting can be directly performed on the power supply layer of the printed circuit board without additionally increasing the power supply layer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art electromagnetic bandgap structure;
FIG. 2 is a schematic diagram of an equivalent circuit model of the electromagnetic bandgap structure of FIG. 1;
FIG. 3 is a schematic diagram of a linear channel electromagnetic bandgap structure in the prior art;
FIG. 4 is a schematic diagram of an equivalent circuit model of the linear channel electromagnetic bandgap structure shown in FIG. 3;
fig. 5 is a schematic structural diagram of a printed circuit board according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an electromagnetic bandgap structure region of another printed circuit board according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an equilateral triangle region of an electromagnetic bandgap structure region of another printed circuit board according to an embodiment of the present invention.
FIG. 8 is a schematic diagram showing the distribution of electromagnetic bandgap structure regions of another printed circuit board according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a simulation of a loss result of an embedded triangle channel and a straight channel of another printed circuit board according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 5 is a schematic structural diagram of a printed circuit board according to an embodiment of the invention, wherein the printed circuit board may include: a predetermined number of electromagnetic bandgap structure regions 10 disposed at the target power supply layer;
each electromagnetic bandgap structure region 10 is in a regular hexagon shape, each electromagnetic bandgap structure region 10 comprises 6 disjoint regular triangle regions 20, one side of each regular triangle region 20 is parallel to the corresponding side of the corresponding electromagnetic bandgap structure region 10, the distance is a preset width, and two sides of each regular triangle region 20 in the 6 regular triangle regions 20 in each electromagnetic bandgap structure region 10 are parallel to one side of the nearest regular triangle region 20; each regular triangle area 20 comprises 3 n Each metal region 30, each metal region 30 has a regular triangle shape, and the side length of each metal region 30 is the side length of the regular triangle region 20 and 2 n Each regular triangle area 20 is provided with 2 on one side n And a metal region 30, wherein the metal region 30 is provided with an electromagnetic band gap structure metal sheet, and n is a positive integer greater than or equal to 1.
It can be understood that the square EBG structure shown in fig. 3 is changed to the regular hexagonal EBG structure by the arrangement of the electromagnetic bandgap structure region 10 in this embodiment; the original linear channel is changed into a hexagonal channel with hollowed periphery through the arrangement of the preset width, and the hollowed hexagonal channel becomes a protective wall, so that noise sources can be restrained outside, and signal interference is avoided;by arranging 6 regular triangle regions 20 in the electromagnetic band gap structure region 10, 6 regular triangle embedded EBGs are added inside and pass through 3 in each regular triangle region 20 n The arrangement of the metal areas 30 can isolate the original noise source and better inhibit noise interference when the triangular channel is hollowed out.
Specifically, for the specific size setting of each electromagnetic bandgap structure region 10 in this embodiment, the designer may set the size setting according to the practical scenario and the user requirement, as shown in fig. 5, the side length of the electromagnetic bandgap structure region 10 in this embodiment may be 20mm, that is, the electromagnetic bandgap structure region 10 may be a regular hexagon with a side length of 20mm, and the side length of the electromagnetic bandgap structure region 10 may also be other values, such as 18mm or 22mm, which is not limited in this embodiment.
Similarly, for the specific value of the preset width in this embodiment, that is, the width of the hexagonal channel formed by the sides of the regular hexagon formed by the 6 regular triangle areas 20 inside each electromagnetic bandgap structure area 10 and the located electromagnetic bandgap structure area 10, the designer may set the specific value by himself, as shown in fig. 5, the preset width may be 2mm; the predetermined width may also be a larger or smaller value, such as 2.2mm. The present embodiment is not limited in this regard as well.
Accordingly, as shown in fig. 5, the 6 disjoint regular triangle areas 20 inside each electromagnetic bandgap structure area 10 may form a regular hexagon, i.e. each regular triangle area 20 in each electromagnetic bandgap structure area 10 has two sides parallel to one side of the respectively closest regular triangle area 20, and the pitch may be the same.
It should be noted that, in this embodiment, the specific size of the regular triangle area 20 in each electromagnetic bandgap structure area 10 may be set by a designer, and as shown in fig. 6, when the side length of the electromagnetic bandgap structure area 10 is 20mm, the side length of the regular triangle area 20 inside the electromagnetic bandgap structure area 10 may be 16mm, so long as the side length of the regular triangle area 20 is smaller than the side length of the electromagnetic bandgap structure area 10, which is not limited in this embodiment.
Corresponding toFor the specific structure of the regular triangle areas 20 in each electromagnetic bandgap structure area 10 in the present embodiment, i.e. the arrangement mode of the EBG metal sheet, the arrangement mode can be set by the designer, such as 3 in each regular triangle area 20 n The metal regions 30 may form n hollowed-out triangular channels, as shown in fig. 6 and 7, where n is 2 and the sides of the triangular regions 20 are 16mm, 9 sides of each triangular region 20 are 4 (i.e. 16/2) 2 ) The metal areas 30 of the regular triangle of mm may be provided with 4 (i.e. 2) by one side of each regular triangle area 20 2 ) The arrangement of the individual metal areas 30 forms two kinds of regular triangle channels with different hollowing dimensions, namely, regular triangle channels with side lengths of 8mm and 4mm, thereby suppressing noise sources, and the hollowing triangle channels can be stacked to have better capacitance, so that the bandwidth can be wider and wider; n may be 1 or a positive integer greater than 2, which is not limited in this embodiment.
That is, in each electromagnetic bandgap structure region 10 in the present embodiment, the EBG metal sheet may be provided only in the metal region 30.
Accordingly, 6 disjoint regular triangle areas 20 inside each electromagnetic bandgap structure area 10 in this embodiment may form a hexagonal EBG, so that the hexagonal EBG may be effectively applied to a PCB circuit board, as shown in fig. 8, and may be intensively distributed on a power supply layer (PWR Plane) of the PCB, so that a desired target power supply layer may be obtained by cutting the EBG of the existing PCB power supply layer. That is, the preset number in this embodiment may be a positive integer greater than 1, and the adjacent edges of two adjacent electromagnetic bandgap structure regions 10 completely overlap, that is, each electromagnetic bandgap structure region 10 may be adjacent to at most 6 electromagnetic bandgap structure regions 10.
Specifically, compared with the conventional square EBG structure, the electromagnetic bandgap structure region 10 with embedded triangle provided in this embodiment has longer channel length than the linear channel distance, so that the capacitance generated by passing through the adjacent metal sheets is better, the bandwidth generated by the increase of the capacitance is longer, and the cut-off depth for suppressing noise is deeper. As shown in fig. 9, when the electromagnetic bandgap structure region 10 shown in fig. 6 is adopted, the bandwidth range of the embedded triangular electromagnetic bandgap structure region 10 is obviously increased, the bandwidth can be extended from 1GHz to 10GHz, the bandwidth is about 9GHz, in addition, the cut-off depth can be increased to about-70 dB, in addition, the capacitance is increased due to the additional embedded triangular channel in the middle of the regular triangle region 20 inside the electromagnetic bandgap structure region 10, the bandwidth for suppressing noise is better, and the signal integrity is better in quality.
In this embodiment, by setting the electromagnetic bandgap structure region 10, the present square EBG structure is changed into a regular hexagonal EBG structure, which is better than the present square EBG structure in noise suppression bandwidth and tape stopping depth, and improves signal integrity, and the present invention can directly make channel cutting on the power layer of the printed circuit board without adding additional power layers.
The printed circuit board provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. A printed circuit board, comprising: the electromagnetic band gap structure areas are arranged in a preset number of the target power supply layers;
wherein each electromagnetic band gap structure region is a regular hexagon, each electromagnetic band gap structure region comprises 6 disjoint regular triangle regions, one side of each regular triangle region is parallel to the corresponding side of the electromagnetic band gap structure region, the distance is a preset width, and each of the 6 regular triangle regions in each electromagnetic band gap structure regionThe two sides of the regular triangle area are parallel to one side of the nearest regular triangle area; each of the regular triangle areas comprises 3 n Each metal region is in a regular triangle shape, and the side length of each metal region is the side length of the regular triangle region and 2 n Each side of the regular triangle area is provided with 2 n And the metal areas are provided with electromagnetic band gap structure metal sheets, and n is a positive integer greater than or equal to 1.
2. The printed circuit board of claim 1, wherein the predetermined number is a positive integer greater than 1, adjacent edges of two adjacent electromagnetic bandgap structure regions being fully coincident.
3. The printed circuit board of claim 1, wherein n is 2.
4. The printed circuit board of claim 1, wherein the predetermined width is 2mm.
5. A printed circuit board according to any of claims 1 to 4, wherein the electromagnetic bandgap structure region has a side length of 20mm.
6. The printed circuit board of any of claim 5, wherein the side of the regular triangular area is 16mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111442701.7A CN114245564B (en) | 2021-11-30 | 2021-11-30 | Printed circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111442701.7A CN114245564B (en) | 2021-11-30 | 2021-11-30 | Printed circuit board |
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| CN114245564A CN114245564A (en) | 2022-03-25 |
| CN114245564B true CN114245564B (en) | 2023-07-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201682693U (en) * | 2010-05-31 | 2010-12-22 | 苏州博海创业微***有限公司 | Electromagnetic band gap structure |
| CN111405747A (en) * | 2020-04-28 | 2020-07-10 | 集美大学 | Structure for inhibiting electromagnetic interference of circuit board and circuit board |
| CN111601452A (en) * | 2020-05-28 | 2020-08-28 | 广东浪潮大数据研究有限公司 | Printed circuit board based on electromagnetic energy gap structure |
| CN111800937A (en) * | 2020-06-19 | 2020-10-20 | 苏州浪潮智能科技有限公司 | Electromagnetic band gap structure and PCB |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101055483B1 (en) * | 2009-04-07 | 2011-08-08 | 포항공과대학교 산학협력단 | Electromagnetic bandgap structure and printed circuit board including the same |
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- 2021-11-30 CN CN202111442701.7A patent/CN114245564B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201682693U (en) * | 2010-05-31 | 2010-12-22 | 苏州博海创业微***有限公司 | Electromagnetic band gap structure |
| CN111405747A (en) * | 2020-04-28 | 2020-07-10 | 集美大学 | Structure for inhibiting electromagnetic interference of circuit board and circuit board |
| CN111601452A (en) * | 2020-05-28 | 2020-08-28 | 广东浪潮大数据研究有限公司 | Printed circuit board based on electromagnetic energy gap structure |
| CN111800937A (en) * | 2020-06-19 | 2020-10-20 | 苏州浪潮智能科技有限公司 | Electromagnetic band gap structure and PCB |
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| CN114245564A (en) | 2022-03-25 |
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