Communication transmission line structure and circuit board

Abstract

The application provides a communication transmission line structure and a circuit board. The communication transmission line structure comprises a plurality of transmission lines arranged in sequence along a first direction, at least one of the transmission lines is provided with a winding area, and the opening direction of the winding area is arranged in parallel with the first direction; and the plurality of transmission lines have a first preset interval. According to the application, the opening direction of the winding area is arranged in parallel with the arrangement direction of the transmission lines, i.e. the winding area is arranged longitudinally, so that the length of the wire in the bending area in the space at the first preset interval from the adjacent two transmission lines can be increased, the length requirement of the transmission line can be met, and the crosstalk between the transmission lines can be reduced.

Description

Communication transmission line structure and circuit board Technical Field

[0001] The present application relates to the field of electric vehicles, and in particular to a communication transmission line structure and a circuit board. Background Art

[0002] In PCB trace design, bends are often designed to meet transmission line length requirements. While meeting the transmission line length requirements, the location and size of the bends are often arbitrary, which can lead to coupling between the bends and adjacent transmission lines, causing signal interference.

[0003] Summary of the Invention

[0004] In order to solve the problems in the prior art, the present application provides a communication transmission line structure and a circuit board to reduce signal interference between multiple transmission lines on the circuit board.

[0005] The present application provides a communication transmission line structure, comprising:

[0006] There are multiple transmission lines, which are arranged in sequence along a first direction. At least one of the transmission lines is provided with a winding area, and the opening direction of the winding area is arranged parallel to the first direction. There is a first preset interval between the multiple transmission lines.

[0007] In one embodiment, a first transmission line among the plurality of transmission lines includes the winding area, the first transmission line further includes a first connecting portion, and the winding area includes a second connecting portion, a third connecting portion, and a fourth connecting portion;

[0008] The first end of the second connection portion is connected to the first connection portion, the second end of the second connection portion is connected to the first end of the third connection portion, and the second end of the third connection portion is connected to the fourth connection portion;

[0009] The second connection portion is arranged in parallel with the fourth connection portion, and the third connection portion is arranged at a first angle to the second connection portion.

[0010] In one embodiment, there are plural third connection parts and plural fourth connection parts, and two ends of the fourth connection part are respectively connected to two adjacent third connection parts.

[0011] In one embodiment, the length of the second connecting portion is the same as the length of the fourth connecting portion.

[0012] In one embodiment, the length of the second connecting portion is greater than or equal to three times the width of the transmission line and less than twice the interval between two adjacent groups of transmission lines.

[0013] In one embodiment, the third connection portion and the second connection portion are arranged at an angle of 135°.

[0014] In one embodiment, the third connecting portion includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence;

[0015] The first end of the first connecting section is connected to the second connecting portion and is arranged at a second angle to the second connecting portion; the second end of the third connecting section is connected to the fourth connecting portion and is arranged at a third angle to the fourth connecting portion.

[0016] In one embodiment, the second angle is consistent with the third angle.

[0017] In one embodiment, the second angle is 120° to 170°.

[0018] The present application also proposes a circuit board, which includes a substrate and the above-mentioned communication transmission line structure; the communication transmission line structure is arranged on the substrate.

[0019] The present application sets the opening direction of the winding area to be parallel to the arrangement direction of the transmission lines, that is, sets the winding area longitudinally, so that the routing length of the bending area can be increased within the space of the first preset interval between two adjacent transmission lines, which can not only meet the length requirements of the transmission lines, but also reduce the crosstalk between the transmission lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a communication transmission line structure in the prior art.

[0021] FIG2 is a schematic structural diagram of a communication transmission line structure according to an embodiment of the present application.

[0022] FIG3 is a comparison diagram of the near-end interference curves of trace 1 to trace 2 in FIG1 and FIG2.

[0023] FIG4 is a comparison diagram of the far-end interference curves of trace1 to trace2 in FIG1 and FIG2.

[0024] FIG5 is a comparison diagram of the near-end interference curves of trace3 on trace2 in FIG1 and FIG2.

[0025] FIG6 is a comparison diagram of the far-end interference curves of trace3 on trace2 in FIG1 and FIG2.

[0026] FIG7 is a schematic diagram of the module structure of the circuit board according to an embodiment of the present application.

[0027] Description of Main Component Symbols Communication transmission line structure 100 Transmission line 110 Winding area 111 First connection portion 112 Second connection portion 111a Third connection portion 111b Fourth connection portion 111c First connection segment b1 Second connection segment b2 Third connection segment b3 Circuit board 10 Substrate 200 First transmission line 110a

[0028] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0029] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Illustrated in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Like reference numerals represent identical or similar components.

[0030] Currently, in the routing design of communication transmission lines, paperclip winding, as shown in Figure 1, is often used to increase the length of the transmission line to meet the required length. However, this winding design results in high crosstalk, and horizontal winding also causes the bends of the winding to be close to other transmission lines, increasing signal coupling.

[0031] 2 , the present application proposes a communication transmission line structure 100 , which includes a plurality of transmission lines 110 , which are arranged in sequence along a first direction, and at least one of the transmission lines 110 is provided with a winding area 111 , wherein an opening direction of the winding area 111 is arranged parallel to the first direction.

[0032] In this embodiment, the communication transmission line structure 100 can be applied to a circuit board 10. A plurality of transmission lines 110 can be provided on a substrate 200 of the circuit board 10 for transmitting signals between two functional circuits.

[0033] In the present application, by setting the opening direction of the winding area 111 to be parallel to the arrangement direction of the transmission lines 110, that is, setting the winding area 111 longitudinally, the routing length of the bending area can be increased within the space of the first preset interval between two adjacent transmission lines 110, which can not only meet the length requirements of the transmission lines 110, but also reduce the crosstalk between the transmission line 110 and other transmission lines 110.

[0034] In one embodiment, taking the example of a first transmission line 110a among the plurality of transmission lines 110 including a winding region 111, the first transmission line 110a further includes a first connecting portion 112, and the winding region 111 includes a second connecting portion 111a, a third connecting portion 111b, and a fourth connecting portion 111c. A first end of the second connecting portion 111a is connected to the first connecting portion 112, a second end of the second connecting portion 111a is connected to the first end of the third connecting portion 111b, and a second end of the third connecting portion 111b is connected to the fourth connecting portion 111c. The second connecting portion 111a is arranged parallel to the fourth connecting portion 111c, and the third connecting portion is arranged at a first angle to the second connecting portion 111a.

[0035] In this embodiment, the first angle may be 120°, 135°, etc. In this way, the opening direction of the bending region can be parallel to the first direction.

[0036] In one embodiment, there are multiple third connection parts 111b and multiple fourth connection parts 111c, and two ends of the fourth connection part 111c are respectively connected to two adjacent third connection parts 111b.

[0037] In this embodiment, the number of third connecting portions 111b and fourth connecting portions 111c can be set based on actual needs, such as the length of the first transmission line 110a. In this way, the winding area 111 can be bent multiple times to increase the length of the first transmission line 110a while maintaining the first spacing distance between adjacent transmission lines 110, thereby preventing increased crosstalk between the first transmission line 110a and other transmission lines 110.

[0038] In one embodiment, the length of the second connection portion 111 a is the same as the length of the fourth connection portion 111 c to achieve a maximum winding length.

[0039] In one embodiment, the length of the second connecting portion 111 a is greater than or equal to three times (3W) the routing width (W) of the first transmission line 110 a and less than twice the interval ( S1 ) between any two adjacent groups of transmission lines 110 .

[0040] In this embodiment, by setting the length of the second connecting portion 111a to be greater than or equal to three times the width of the first transmission line 110a, impedance matching can be better achieved. By setting the length of the second connecting portion 111a to be less than twice the distance between two adjacent groups of transmission lines 110, crosstalk between adjacent transmission lines 110 can be reduced.

[0041] In one embodiment, the third connecting portion 111b includes a first connecting segment b1, a second connecting segment b2, and a third connecting segment b3, which are sequentially connected. The first end of the first connecting segment b1 is connected to the second connecting portion 111a and is disposed at a second angle thereto. The second end of the third connecting segment b3 is connected to the fourth connecting portion 111c and is disposed at a third angle thereto.

[0042] In this embodiment, the routing position of the first transmission line 110a can be appropriately set by flexibly setting the second angle and the third angle. For example, if there is a space below the wiring layer of the first transmission line 110a that needs to be avoided, the first transmission line 110a can be made to bypass the space by setting the second angle and the third angle appropriately.

[0043] In one embodiment, the second angle is consistent with the third angle, wherein the second angle may be 120° to 170°.

[0044] In one embodiment, the second connection portion 111a may be arranged at a fourth angle with the first connection portion 112. The fourth connection portion 111c may be arranged at a fifth angle with the connection portion behind it. The fourth angle and the fifth angle may be consistent with the second angle.

[0045] In one embodiment, there are three transmission lines 110, namely trace1, trace2, and trace3, with trace2 having a winding area 111. The width w of the transmission line 110 can be set to 7 mils, the first predetermined interval s1 can be set to 20 mils, the interval between the third connecting portion 111b and the adjacent fourth connecting portion 111c, and the interval s2 between two adjacent fourth connecting portions 111c can be set to 21 mils, the second angle α and the third angle α can be set to 135°, the lengths of the first connecting segment b1, the second connecting segment b2, and the third connecting segment b3 can all be set to 11.6 mils, and the length D of the fourth connecting portion 111c can be set to 40 mils.

[0046] Referring to Figures 3 to 6 , the crosstalk curves for trace 1, trace 2, and trace 3 are shown. It can be seen that the communication transmission line structure 100 of the present application can effectively reduce the crosstalk between transmission lines 110. The following table shows the far-end crosstalk data and near-end crosstalk data for trace 1 and trace 3. It can be seen that at the 2.4 GHz and 2.8 GHz frequencies, the communication transmission line structure 100 of the present application significantly improves both far-end crosstalk and near-end crosstalk.

[0047] 7 , the present application further proposes a circuit board 10 , which includes a substrate 200 and the aforementioned communication transmission line structure 100 ; the communication transmission line structure 100 is disposed on the substrate 200 .

[0048] The detailed structure of the communication transmission line structure 100 can be referred to the above-mentioned embodiment and will not be repeated here. It can be understood that since the above-mentioned communication transmission line structure 100 is used in the circuit board 10 of the present application, the embodiment of the circuit board 10 of the present application includes all technical solutions of all embodiments of the above-mentioned communication transmission line structure 100, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0049] The specific embodiments of the present application have been described above with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions may be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. Such modifications and substitutions are intended to fall within the scope of the present application.

Claims

1. A communication transmission line structure, characterized in that, The communication transmission line structure includes: Multiple transmission lines, which are arranged in sequence along a first direction. At least one of the transmission lines is provided with a winding area, and the opening direction of the winding area is parallel to the first direction; there is a first preset interval between the multiple transmission lines.

2. The communication transmission line structure according to claim 1, characterized in that, The first transmission line among the multiple transmission lines includes the winding area, and the first transmission line further includes a first connection part. The winding area includes a second connection part, a third connection part, and a fourth connection part; The first end of the second connection part is connected to the first connection part, the second end of the second connection part is connected to the first end of the third connection part, and the second end of the third connection part is connected to the fourth connection part; The second connection part and the fourth connection part are arranged in parallel, and the third connection part forms a first included angle with the second connection part.

3. The communication transmission line structure according to claim 2, wherein The number of both the third connection part and the fourth connection part is multiple, and both ends of the fourth connection part are respectively connected to two adjacent third connection parts.

4. The communication transmission line structure according to claim 2, wherein The length of the second connection part is the same as the length of the fourth connection part.

5. The communication transmission line structure according to claim 4, characterized in that, The length of the second connection part is greater than or equal to three times the width of the transmission line and less than twice the interval between two adjacent groups of transmission lines.

6. The communication transmission line structure according to claim 2, characterized in that, The third connection part forms a 135° included angle with the second connection part.

7. The communication transmission line structure according to claim 2, wherein The third connection part includes a first connection segment, a second connection segment, and a third connection segment that are connected in sequence; The first end of the first connection segment is connected to the second connection part and forms a second included angle with the second connection part; the second end of the third connection segment is connected to the fourth connection part and forms a third included angle with the fourth connection part.

8. The communication transmission line structure according to claim 7, wherein, The second included angle is the same as the third included angle.

9. The communication transmission line structure according to claim 8, characterized in that, The second included angle is 120° - 170°.

10. A circuit board, characterized in that, The circuit board includes a substrate and the communication transmission line structure according to any one of claims 1 to 9; the communication transmission line structure is arranged on the substrate.

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