Signal transmission line and connector

Abstract

To provide a technique capable of reducing crosstalk.SOLUTION: A signal transmission line includes a plurality of conductor lines each having a first end portion connected to a first differential transmission path and a second differential transmission path, the plurality of conductor lines each having, on a side of the first end portion, a plurality of connection end portions connected to the first differential transmission path and the second differential transmission path, a holding portion that arranges and holds the plurality of conductor lines along a predetermined arrangement direction, and a first shielding member that is disposed to face side surfaces of the plurality of conductor lines along the arrangement direction and shields electromagnetic waves radiated from the plurality of conductor lines.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a signal transmission line and a connector. [Background technology]

[0002] Patent Document 1 discloses a board-to-board connector. This board-to-board connector has a plurality of differential transmission lines. The plurality of differential transmission lines are arranged along a predetermined arrangement direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-149770 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above connector, crosstalk may occur between a pair of adjacent differential transmission lines among the plurality of differential transmission lines, which may result in a decrease in communication quality. Therefore, a technique capable of reducing crosstalk is desired.

[0005] An object of the present disclosure is to provide a technique that can reduce crosstalk. [Means for solving the problem]

[0006] The signal transmission line of the embodiment is a signal transmission line having a first end connected to a first differential transmission line and a second differential transmission line, and includes a plurality of conductor lines having a plurality of connection ends connected to the first differential transmission line and the second differential transmission line on the first end side, a holding section that arranges and holds the plurality of conductor lines along a predetermined arrangement direction, and a first shielding member that is arranged opposite a side surface of the plurality of conductor lines along the arrangement direction and that shields electromagnetic waves radiated from the plurality of conductor lines. [Effects of the Invention]

[0007] According to the present disclosure, crosstalk can be reduced. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an example of a connector according to a first embodiment. [Figure 2] FIG. 2 is a diagram showing a part of the plug as viewed from the Y1 direction. [Figure 3] FIG. 3 is a side view of the plug terminal and the socket terminal. [Figure 4] FIG. 4 is a diagram showing a part of the plug as viewed from the X1 direction. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a diagram showing the first shielding member as viewed from the Y2 direction, and is a diagram showing an example of a periodic structure. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a view showing a part of the plug according to the second embodiment. [Figure 9] FIG. 9 is a view showing a part of a plug according to a third embodiment. [Figure 10] FIG. 10 is a view showing a part of the plug according to the fourth and fifth embodiments. [Figure 11] FIG. 11 is a partial cross-sectional view of the plug according to the sixth, seventh and eighth embodiments. [Figure 12] FIG. 12 is a view showing a part of a plug according to a ninth embodiment. [Figure 13] FIG. 13 is a diagram showing a part of the plug as viewed from the Y2 direction. [Figure 14] FIG. 14 is a diagram showing the first shielding member of the ninth embodiment as viewed from the Y2 direction, and is a diagram showing an example of a periodic structure. [Figure 15] FIG. 15 is a graph showing frequency characteristics of S21 in Example 1 and Comparative Example 1. [Figure 16] FIG. 16 is a graph showing frequency characteristics of S41 in Example 1 and Comparative Example 1. [Figure 17] FIG. 17 is a graph showing the frequency characteristics of S31 in Example 1 and Comparative Example 1. [Figure 18] FIG. 18 is a diagram showing an example of the electric field distribution in the XY plane in the first comparative example. [Figure 19] FIG. 19 is a diagram illustrating an example of an electric field distribution in the XY plane in the first embodiment. [Figure 20] FIG. 20 is a graph showing the frequency characteristics of S41 when the distance a in the first embodiment is changed. [Figure 21] FIG. 21 is a graph showing the frequency characteristics of S41 when the distance a in the first embodiment is changed. [Figure 22] FIG. 22 is a graph showing the frequency characteristics of S41 when the periodic structure of Example 1 is made of nickel. [Figure 23] FIG. 23 is a graph showing the frequency characteristics of S41 in the second embodiment. [Figure 24] FIG. 24 is a graph showing the frequency characteristics of S41 in the third embodiment. [Figure 25] FIG. 25 is a graph showing the frequency characteristics of S41 in Examples 4 and 5. [Figure 26] FIG. 26 is a graph showing the frequency characteristics of S41 in Examples 6, 7, and 8. [Figure 27] FIG. 27 is a graph showing frequency characteristics of S41 in Comparative Example 1 and Comparative Example 2. In FIG. [Figure 28] FIG. 28 is a graph showing frequency characteristics of S31 in Comparative Example 1 and Comparative Example 2. In FIG. [Figure 29] FIG. 29 is a graph showing the frequency characteristics of S41 in the ninth embodiment. [Figure 30] FIG. 30 is a graph showing the frequency characteristics of S31 in Example 9. [Figure 31] FIG. 31 is a diagram for explaining an incident wave on the first shielding member of the first embodiment. [Figure 32] FIG. 32 is a graph showing the frequency characteristics of the reflection loss when an incident wave is made incident on the first shielding member 26 of the first embodiment. [Figure 33] FIG. 33 is an enlarged view of the band around 4.74 GHz in FIG. [Figure 34] FIG. 34 is an enlarged view of the band around 11.4 GHz in FIG. [Figure 35] FIG. 35 is an enlarged view of the band around 17.5 GHz in FIG. [Figure 36] FIG. 36 is a graph showing the frequency characteristics of the reflection loss when an incident wave is made incident on the first shielding member of Example 9. DETAILED DESCRIPTION OF THE INVENTION

[0009] First, the contents of the embodiment will be listed and explained. [Outline of the embodiment]

[0010] (1) A signal transmission line according to an embodiment has a first end connected to a first differential transmission line and a second differential transmission line. The signal transmission line includes a plurality of conductor lines having a plurality of connection ends connected to the first differential transmission line and the second differential transmission line at the first end, a holding section that holds the conductor lines in an arrangement direction, and a first shielding member that is arranged opposite a side surface of the conductor lines in the arrangement direction and that shields electromagnetic waves radiated from the conductor lines. According to the above configuration, the first shielding member can prevent electromagnetic waves radiated from the plurality of conductor lines from circulating between the plurality of conductor lines. As a result, when two-system signal transmission by the first differential transmission path and the second differential transmission path is performed by a plurality of conductor lines, crosstalk occurring between the plurality of conductor lines can be reduced.

[0011] (2) The signal transmission line of (1) above may further include a second shielding member that is disposed opposite the first shielding member so as to sandwich the plurality of conductor lines and that shields electromagnetic waves radiated from the plurality of conductor lines. In this case, it is possible to suppress electromagnetic waves from escaping between multiple conductor lines from two directions, thereby more effectively reducing crosstalk.

[0012] (3) In the signal transmission line of (1) or (2) above, the first shielding member may be provided in a portion of the area from the first end to a second end opposite the first end in the direction in which the plurality of conductor lines extend. Crosstalk may occur significantly in a specific portion between the first end and the second end. Therefore, by providing the first shielding member in the specific portion where crosstalk occurs significantly, crosstalk can be effectively reduced without providing the first shielding member over the entire area between the first end and the second end.

[0013] (4) In the signal transmission line of (1) or (2) above, the first shielding member may be provided at a position including a central portion between the first end and a second end on the opposite side of the first end in the direction in which the plurality of conductor lines extend. Crosstalk can occur significantly at a node of resonance occurring between the first end and the second end. Therefore, by providing the first shielding member so as to include a central portion that can be a node of resonance occurring between the first end and the second end, crosstalk can be effectively reduced without providing the first shielding member over the entire area between the first end and the second end.

[0014] (5) In the signal transmission line of any one of (1) to (4) above, the plurality of conductor lines may include a pair of signal lines connected to the first differential transmission line and a pair of ground lines arranged on both sides of the pair of signal lines, a first ground line of the pair of ground lines being located at an end of the plurality of conductor lines in the arrangement direction, the first shielding member having a rectangular plate shape with a pair of sides along the direction in which the plurality of conductor lines extend, and when the first shielding member is viewed from the front, the side of the pair of sides located at the end side may be located on the first ground line. In this case, the first shielding member faces at least the side surfaces of a pair of signal lines among the plurality of conductor lines. Therefore, the first shielding member prevents electromagnetic waves radiated from the pair of signal lines and the other conductor lines from going around each other.

[0015] (6) In the signal transmission line according to any one of (1) to (5) above, the first shielding member may include a rectangular ground conductor plate. In this case, the ground conductor plate can prevent electromagnetic waves radiated from the plurality of conductor lines from circling between the plurality of conductor lines.

[0016] (7) In the signal transmission line of (1) to (5) above, the first shielding member may have a rectangular dielectric substrate having a first surface facing the plurality of conductor lines and a second surface opposite the first surface, and a ground conductor plate laminated on the second surface. In this case, the dielectric substrate and the ground conductor plate can prevent electromagnetic waves radiated from the plurality of conductor lines from circumventing each other among the plurality of conductor lines.

[0017] (8) In the signal transmission line of (7) above, the first shielding member may further include one or more unit cells including a predetermined conductor pattern provided on the first surface. In this case, the one or more unit cells, the dielectric substrate, and the ground conductor plate can prevent electromagnetic waves radiated from the multiple conductor lines from circumventing each other among the multiple conductor lines.

[0018] (9) In the signal transmission line of (7) above, the first shielding member may further include a periodic structure in which a plurality of unit cells, each including a predetermined conductor pattern, are periodically arranged on the first surface. In this case, the periodic structure, the dielectric substrate, and the ground conductor plate can prevent electromagnetic waves radiated from the plurality of conductor lines from circumventing each other among the plurality of conductor lines.

[0019] (10) In the signal transmission line of (9), the periodic structure may further include a plurality of vias that penetrate the dielectric substrate and connect the plurality of unit cells to the ground conductor plate. In this case, the dielectric substrate, the periodic structure including the plurality of vias, and the ground conductor plate can prevent electromagnetic waves radiated from the plurality of conductor lines from circumventing each other between the plurality of conductor lines.

[0020] (11) In the signal transmission line of (10) above, the plurality of conductor lines may include a pair of signal lines connected to the first differential transmission line and a pair of ground lines arranged on both sides of the pair of signal lines, a first ground line of the pair of ground lines being located at an end of the plurality of conductor lines in the arrangement direction, the periodic structure having a rectangular shape with a pair of structure sides along the longitudinal direction, and when the first shielding member is viewed from the front, the structure side of the pair of structure sides located at the end side may be located closer to the pair of signal lines than the first ground line. In this case, if the structure side on the end side of the first shielding member is positioned outside the pair of signal lines, the electromagnetic waves radiated from the pair of signal lines are blocked by the periodic structure.

[0021] (12) In the signal transmission line of (11) above, when the first shielding member is viewed from the front, the structure side on the end side may be located between the pair of signal lines. In this case, the periodic structure is disposed opposite the side surface of at least one of the pair of signal lines, so that electromagnetic waves radiated from one of the pair of signal lines are blocked by the first shielding member.

[0022] (13) In the signal transmission line of any one of (9) to (12) above, when the distance between the side surfaces of the plurality of conductor lines and the periodic structure is a and the pitch of the plurality of conductor lines in the arrangement direction is p, the following formula may be satisfied: 1 ≦ a / p ≦ 2 In this case, if a / p is less than 1, the first shielding member may affect the multiple conductor lines. If a / p is greater than 2, the first shielding member may not be effective in shielding electromagnetic waves radiated from the multiple conductor lines. By setting a / p between 1 and 2, it is possible to appropriately shield electromagnetic waves radiated from the multiple conductor lines.

[0023] (14) In the signal transmission line of any one of (8) to (13) above, the predetermined conductor pattern included in the unit cell may have a characteristic of attenuating electromagnetic waves of a predetermined frequency band among incident waves, and a resonant frequency occurring between the first end and a second end opposite the first end may be included in the predetermined frequency band. Crosstalk may occur at a resonant frequency between the first end and the second end, so by ensuring that the resonant frequency is included in the frequency band that can be shielded by the conductor pattern, crosstalk can be effectively reduced.

[0024] (15) An embodiment from another viewpoint is a connector provided on a substrate, the connector having a first end connected to a first differential transmission line and a second differential transmission line provided on the substrate. The connector includes: The device comprises a plurality of linear terminals having a plurality of connection ends connected to the first differential transmission path and the second differential transmission path on the first end side, a holding portion that holds the plurality of terminals in an array along a predetermined array direction, and a first shielding member that is arranged opposite a side surface of the plurality of terminals in the array direction and that shields electromagnetic waves radiated from the plurality of terminals.

[0025] [Details of the embodiment] Preferred embodiments will now be described with reference to the drawings. At least some of the embodiments described below may be combined in any manner. [Regarding the first embodiment] [Overall configuration of the connector] FIG. 1 is a perspective view showing an example of a connector according to a first embodiment. This connector 1 is a board-to-board connector that electrically connects a first circuit board 2 and a second circuit board 3.

[0026] In the following description, the three mutually orthogonal directions in each drawing are referred to as the X direction, Y direction, and Z direction. Also, as shown in FIG. 1, one of the X directions is referred to as the X1 direction, and the opposite direction of the X1 direction is referred to as the X2 direction. One of the Y directions is referred to as the Y1 direction, and the opposite direction of the Y1 direction is referred to as the Y2 direction. One of the Z directions is referred to as the Z1 direction, and the opposite direction of the Z1 direction is referred to as the Z2 direction.

[0027] 1, the first circuit board 2 and the second circuit board 3 are arranged parallel to the XY plane. The first circuit board 2 and the second circuit board 3 have a rectangular shape with each side parallel to the X direction or the Y direction.

[0028] A first differential transmission path 4 and a second differential transmission path 5 are mounted on the surface of the first circuit board 2 on the Z1 direction side. The first differential transmission path 4 and the second differential transmission path 5 are provided parallel to each other along the Y direction. The Y1-direction end of the first differential transmission path 4 and the Y1-direction end of the second differential transmission path 5 are located on the Y1-direction side of the first circuit board 2.

[0029] The first differential transmission path 4 includes a pair of signal lines 4a. A differential transmission signal including a pair of signals of opposite phases is transmitted through the pair of signal lines 4a. The second differential transmission path 5 includes a pair of signal lines 5a. A differential transmission signal including a pair of signals of opposite phases is transmitted through the pair of signal lines 5a.

[0030] The Y1-direction end of the first differential transmission line 4 and the Y1-direction end of the second differential transmission line 5 are connected to the connector 1. The Y2-direction end of the first differential transmission line 4 and the Y2-direction end of the second differential transmission line 5 are connected to electronic components mounted on the first circuit board 2. The electronic components exchange differential transmission signals with the second circuit board 3. 1 shows a portion of the first circuit board 2 including the side in the Y1 direction, and the portion of the first circuit board 2 in the Y2 direction is omitted.

[0031] The first differential transmission line 4 and the second differential transmission line 5 are configured as coplanar lines. Therefore, ground conductors 8 are provided on the X2 direction side of the first differential transmission line 4, the X1 direction side of the second differential transmission line 5, and the portion between the two differential transmission lines 4 and 5. In addition, a ground conductor 9 is provided on the Z2 direction surface of the first circuit board 2. The ground conductors 8 and 9 are connected by a plurality of vias 10. The multiple vias 10 are provided side by side on both sides of the first differential transmission line 4 and the second differential transmission line 5 in the X direction.

[0032] A third differential transmission path 6 and a fourth differential transmission path 7 are mounted on the surface of the second circuit board 3 on the Z2 direction side. The second circuit board 3 has the same configuration as the first circuit board 2. Therefore, the third differential transmission line 6 and the fourth differential transmission line 7 are also configured as coplanar lines. The third differential transmission path 6 includes a pair of signal lines 6a. A differential transmission signal including a pair of signals of opposite phases is transmitted through the pair of signal lines 6a. The fourth differential transmission path 7 includes a pair of signal lines 7a. A differential transmission signal including a pair of signals of opposite phases is transmitted through the pair of signal lines 7a.

[0033] The Y1-direction end of the third differential transmission line 6 and the Y1-direction end of the fourth differential transmission line 7 are connected to the connector 1. The Y2-direction end of the third differential transmission line 6 and the Y2-direction end of the fourth differential transmission line 7 are connected to electronic components mounted on the second circuit board 3. These electronic components exchange differential transmission signals with the first circuit board 2. 1 shows a portion of the second circuit board 3 including the side in the Y1 direction, and the portion of the second circuit board 3 in the Y2 direction is omitted.

[0034] The connector 1 connects the first differential transmission line 4 and the third differential transmission line 6 to each other, and together with the first differential transmission line 4 and the third differential transmission line 6 constitute a line through which a differential transmission signal is transmitted. Furthermore, the connector 1 connects the second differential transmission line 5 and the fourth differential transmission line 7 to each other, and together with the second differential transmission line 5 and the fourth differential transmission line 7, constitute a line through which a differential transmission signal is transmitted.

[0035] The connector 1 extends along the Z direction. The connector 1 has a first end 1a on the Z2 direction side and a second end 1b on the Z1 direction side. The first end 1a is connected to a first differential transmission path 4 and a second differential transmission path 5 of a first circuit board 2. The second end 1b is connected to a third differential transmission path 6 and a fourth differential transmission path 7 of a second circuit board 3.

[0036] The connector 1 includes a plug 12 and a socket 14. The plug 12 is provided on the first end 1a side (the first circuit board 2 side). The socket 14 is provided on the second end 1b side (the second circuit board 3 side). The plug 12 and the socket 14 can be fitted to each other. Fig. 1 shows the plug 12 and the socket 14 in a fitted state. When the plug 12 and the socket 14 are fitted to each other, the connector 1 connects the first differential transmission line 4 and the third differential transmission line 6 to each other, and also connects the second differential transmission line 5 and the fourth differential transmission line 7 to each other.

[0037] The plug 12 includes a plug housing 16 and a plurality of plug terminals 18. Note that part of the plug housing 16 is omitted in FIG. The socket 14 also includes a socket housing 20 and a plurality of socket terminals 22 .

[0038] 2 is a diagram showing a part of the plug 12 as seen from the Y1 direction. Note that in FIG. 2, some of the members are cut away for ease of understanding. The plurality of plug terminals 18 are members made of a conductor such as copper, each having a rectangular cross section, and each having a pin shape extending in the Z direction. 2, a plurality of (eight in the illustrated example) plug terminals 18 are arranged in a predetermined arrangement direction (X direction). The eight plug terminals 18 are arranged at a constant pitch p.

[0039] As shown in FIG. 1, the eight plug terminals 18 have eight connection ends 18a, eight contact piece portions 18b, and eight main body portions 18c. Fig. 3 is a side view of the plug terminal 18 and the socket terminal 22. Fig. 3 shows the plug terminal 18 and the socket terminal 22, and omits other parts. 3, the connection end 18a is provided at the end on the first end 1a side (Z2 direction side) of both ends of the plug terminal 18. The connection end 18a is connected to the first differential transmission path 4 or the second differential transmission path 5 of the first circuit board 2. The contact piece portion 18b is provided at the end on the socket 14 side (Z1 direction side) of both ends of the plug terminal 18. The contact piece portion 18b is a portion that comes into contact with the socket terminal 22 of the socket 14. The main body portion 18c connects the connection end portion 18a and the contact piece portion 18b, and is formed linearly along the Z direction.

[0040] Of the eight connection ends 18a, four connection ends 18a aligned in the X2 direction are connected to the first differential transmission line 4, and the remaining four connection ends 18a are connected to the second differential transmission line 5. More specifically, of the eight connection ends 18a, the second connection end 18a from the X2 direction and the third connection end 18a from the X2 direction are connected to the pair of signal lines 4a. Of the eight connection ends 18a, the second connection end 18a from the X1 direction and the third connection end 18a from the X1 direction are connected to the pair of signal lines 5a. Of the eight connection ends 18a, the remaining connection ends 18a are connected to the ground conductor 8.

[0041] FIG. 4 is a diagram showing a part of the plug 12 as viewed from the X1 direction. The plug housing 16 includes a housing body 24, a first shielding member 26, and a second shielding member 27. The housing body 24 is a member formed from an insulating material such as resin. The housing body 24 holds a plurality of plug terminals 18 arranged in the arrangement direction. The housing body 24 includes a tip portion 24a (connection side end portion), a base portion 24b (board side end portion), and an intermediate portion 24c. The base portion 24b is a member on the first end portion 1a side and holds a plurality of connection end portions 18a. The tip portion 24a is a member located on the Z1 direction side of the base portion 24b and holds a plurality of contact piece portions 18b. The tip portion 24a is a member that is fitted into the socket 14 (connected portion). The intermediate portion 24c is a member that connects the tip portion 24a and the base portion 24b and holds a plurality of main body portions 18c. 4 and 5, the intermediate portion 24c is indicated by a two-dot chain line, but is omitted from the other figures for ease of understanding.

[0042] 1, 2, and 4, the first shielding member 26 and the second shielding member 27 are rectangular plate-shaped members extending along the XZ plane. The first shielding member 26 and the second shielding member 27 are disposed opposite each other with the plurality of plug terminals 18 interposed therebetween. The first shielding member 26 is provided on the Y1 side of the plurality of plug terminals 18. The second shielding member 27 is provided on the Y2 side of the plurality of plug terminals 18. The first shielding member 26 and the second shielding member 27 are fixed to the middle portion 24c. The first shielding member 26 and the second shielding member 27 will be described later.

[0043] As described above, the socket 14 includes a socket housing 20 and a plurality of socket terminals 22 . Similar to the plug terminals 18, the socket terminals 22 are members with a rectangular cross section made of a conductor such as copper, and have a pin shape extending in the Z direction. A plurality of (eight in the illustrated example) socket terminals 22 are arranged in the arrangement direction (X direction) at the same pitch p as the plug terminals 18.

[0044] As shown in FIG. 1, the eight socket terminals 22 have eight connection ends 22a, eight contact piece portions 22b, and eight main body portions 22c. 3, the connection end 22a is provided at the end on the second end 1b side (Z1 direction side) of both ends of the socket terminal 22. The connection end 22a is connected to the third differential transmission path 6 or the fourth differential transmission path 7 of the second circuit board 3. The contact piece portion 22b is provided at the end on the plug 12 side (Z2 direction side) of both ends of the socket terminal 22. The contact piece portion 22b is a portion that comes into contact with the plug terminal 18 of the plug 12.

[0045] The main body portion 22c connects the connection end portion 22a and the contact piece portion 22b. Of the eight connection ends 22a, four connection ends 22a aligned in the X2 direction are connected to the third differential transmission line 6, and the remaining four connection ends 22a are connected to the fourth differential transmission line 7. More specifically, of the eight connection ends 22a, the second connection end 22a from the X2 direction and the third connection end 22a from the X2 direction are connected to a pair of signal lines 6a. Of the eight connection ends 22a, the second connection end 22a from the X1 direction and the third connection end 22a from the X1 direction are connected to a pair of signal lines 7a. Of the eight connection ends 22a, the remaining connection ends 22a are connected to ground conductors.

[0046] The socket housing 20 is a member formed from resin, etc. The socket housing 20 holds a plurality of socket terminals 22 arranged in an arrangement direction.

[0047] When the plug 12 and the socket 14 are mated, the eight contact pieces 18b and the eight contact pieces 22b come into contact with each other as shown in FIG. Therefore, when the plug 12 and the socket 14 are mated, the eight plug terminals 18 and the eight socket terminals 22 are electrically connected. As a result, the connector 1 connects the first differential transmission line 4 and the third differential transmission line 6 to each other, and also connects the second differential transmission line 5 and the fourth differential transmission line 7 to each other. Furthermore, eight pairs of plug terminals 18 and socket terminals 22 that contact each other form eight conductor lines that connect the differential transmission lines 4, 5 and the differential transmission lines 6, 7 to each other.

[0048] In FIG. 2, of the eight plug terminals 18, the four plug terminals 18 aligned in the X2 direction are first lines T1 that connect the first differential transmission line 4 and the third differential transmission line 6, and the remaining four plug terminals 18 are second lines T2 that connect the second differential transmission line 5 and the fourth differential transmission line 7. Furthermore, a pair of terminals 18s1 included in the first line T1 are signal lines that connect the pair of signal lines 4a and the pair of signal lines 6a. A pair of terminals 18g1 included in the first line T1 are ground lines connected to the ground conductors 8 and 9. Similarly, the pair of terminals 18s2 included in the second line T2 are signal lines that connect the pair of signal lines 5a and the pair of signal lines 7a. A pair of terminals 18g2 included in the second line T2 are ground lines connected to the ground conductors 8 and 9.

[0049] [Shielding member] FIG. 5 is a cross-sectional view taken along line VV in FIG. As shown in FIGS. 4 and 5, the first shielding member 26 and the second shielding member 27 are fixed to outer surfaces 24c1 and 24c2 of the middle portion 24c of the housing main body 24. The middle portion 24c has a rectangular parallelepiped shape with each side aligned along the X, Y, and Z directions. The outer surface 24c1 is the surface of the middle portion 24c facing the Y1 direction. The outer surface 24c2 is the surface of the middle portion 24c facing the Y2 direction. The middle portion 24c has eight slots 24c3 for holding the eight plug terminals 18.

[0050] As described above, the first shielding member 26 and the second shielding member 27 have a rectangular plate shape along the XZ plane. The size of the first shielding member 26 and the size of the second shielding member 27 are the same. The first shielding member 26 and the second shielding member 27 are provided between the tip portion 24a and the base portion 24b, and therefore, the first shielding member 26 and the second shielding member 27 are provided in a portion of the connector 1 between the first end 1a and the second end 1b. Furthermore, the dimensions of the first shielding member 26 in the X direction and the dimensions of the second shielding member 27 in the X direction are larger than the dimensions of the tip portion 24a in the X direction and the dimensions of the base portion 24b in the X direction.

[0051] The first shielding member 26 is fixed to the outer surface 24c1 of the middle portion 24c, and is disposed opposite the side surfaces of the eight plug terminals 18 (conductor lines) along the arrangement direction. Furthermore, the second shielding member 27 is fixed to the outer surface 24c2 of the intermediate portion 24c, and is disposed opposite the first shielding member 26 so as to sandwich the eight plug terminals 18 therebetween. Therefore, intermediate portions 24c are interposed between first shielding member 26 and eight plug terminals 18. Similarly, intermediate portions 24c are interposed between second shielding member 27 and eight plug terminals 18. Therefore, the distance in the Y direction between the side surfaces of the eight plug terminals 18 and the first shielding member 26 is determined by the dimension of the intermediate portion 24c. The distance between the side surfaces of the eight plug terminals 18 and the second shielding member 27 is also determined by the dimension of the intermediate portion 24c. The first shielding member 26 and the second shielding member 27 may be provided integrally with the intermediate portion 24c (housing main body 24).

[0052] 5, the first shielding member 26 has a dielectric substrate 38, a periodic structure 30, and a ground conductor plate 32. The dielectric substrate 38 has a first surface 38a and a second surface 38b. The first surface 38a faces the eight plug terminals 18 and faces in the Y2 direction. The second surface 38b is the opposite surface to the first surface 38a and faces in the Y1 direction. The periodic structure 30 is provided on the first surface 38a, and the ground conductor plate 32 is provided on the second surface 38b.

[0053] The second shielding member 27 also has a dielectric substrate 39, a periodic structure 34, and a ground conductor plate 36. The dielectric substrate 39 has a first surface 39a and a second surface 39b. The first surface 39a faces the eight plug terminals 18 and faces in the Y1 direction. The second surface 39b is the opposite surface to the first surface 39a and faces in the Y2 direction. The periodic structure 30 is provided on the first surface 39a, and the ground conductor plate 32 is provided on the second surface 39b.

[0054] The second shielding member 27 has the same configuration as the first shielding member 26. Therefore, in the following explanation, the first shielding member 26 will be explained.

[0055] Fig. 6 is a diagram of the first shielding member 26 as viewed from the Y2 direction, and is a diagram showing an example of the periodic structure 30. Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 6. As shown in FIG. 7, the first shielding member 26 includes a dielectric substrate 38, a periodic structure 30, and a ground conductor plate 32.

[0056] The dielectric substrate 38 is a rectangular rigid substrate and may be made of a material such as polyimide resin, epoxy resin, PPE resin, or fluororesin. The ground conductor plate 32 is a conductor pattern mounted on the second surface 38b. The conductor pattern is made of a conductor such as copper foil. The ground conductor plate 32 is mounted so as to extend over the entire surface of the second surface 38b.

[0057] As shown in FIG. 6, the periodic structure 30 includes a plurality of unit cells 42 periodically arranged on the first surface 38a. In this embodiment, the unit cells 42 are arranged at equal intervals in the X and Z directions. In the periodic structure 30 of this embodiment, five unit cells 42 are arranged in the X direction and five unit cells 42 are arranged in the Z direction. Therefore, the periodic structure 30 of this embodiment includes 25 unit cells 42. Each of the plurality of unit cells 42 has a square shape. Each unit cell 42 has a square land portion 42a and a strip portion 42b. The land portion 42a and the strip portion 42b are conductor patterns made of copper foil, nickel foil, or the like, mounted on the first surface 38a. The land portion 42a is disposed at the center of the unit cell 42. The strip portion 42b is formed in a quadrangular spiral shape so as to surround the periphery of the land portion 42a from the corner of the land portion 42a.

[0058] The periodic structure 30 further includes a plurality of vias 44. The vias 44 penetrate the dielectric substrate 38 and connect the land portions 42a of the unit cells 42 to the ground conductor plate 32. Each of the unit cells 42 included in the periodic structure 30 of this embodiment having the above configuration functions as a resonant element. That is, the strip portions 42b resonate with electromagnetic waves of a predetermined frequency band among waves incident on the periodic structure 30, and the strip portions 42b attenuate the electromagnetic waves of the predetermined frequency band. The frequency band in which the unit cell 42 can attenuate electromagnetic waves is determined primarily by the length of the strip portion 42b, which is set to approximately 1 / 4 of the wavelength of the electromagnetic waves to be attenuated. The length of the strip portion 42b can be determined by the widths w1, w2, w3 and the intervals d1 and d2. The widths w1, w2, w3 and the intervals d1 and d2 are the dimensions of each part of the unit cell 42. The width w1 is the dimension of one side of the unit cell 42. The width w2 is the dimension of one side of the land portion 42a. The width w3 is the width dimension of the strip portion 42b. The interval d1 is the distance between the strip portions 42b and between the strip portion 42b and the land portion 42a. The interval d2 is the distance between the periphery of the unit cell 42 and the strip portion 42b.

[0059] The first shielding member 26 has the function of shielding electromagnetic waves radiated from the eight plug terminals 18 (multiple conductor lines) by means of a dielectric substrate 38, a periodic structure 30 (unit cell 42) that attenuates electromagnetic waves, and a ground conductor plate 32.

[0060] Here, the first line T1 (the pair of terminals 18s1) and the second line (the pair of terminals 18s2) in the connector 1 of this embodiment are adjacent to each other in the arrangement direction. This may cause crosstalk between the first line T1 and the second line T2, which may degrade communication quality.

[0061] In contrast to this, in the present embodiment, the first shielding member 26 and the second shielding member 27, which have the function of shielding electromagnetic waves, are arranged opposite the side surfaces of the eight plug terminals 18 that constitute the first line T1 and the second line T2, and therefore the first shielding member 26 and the second shielding member 27 can prevent the electromagnetic waves radiated from the pair of terminals 18s1 and the pair of terminals 18s2 from circulating between the pair of terminals 18s1 and the pair of terminals 18s2. As a result, crosstalk occurring between the first line T1 and the second line T2 can be reduced.

[0062] Furthermore, in this embodiment, the second shielding member 27 is disposed opposite the first shielding member 26 so as to sandwich the eight plug terminals 18 that make up the first line T1 and the second line T2, so that electromagnetic waves that circulate between the pair of terminals 18s1 and the pair of terminals 18s2 can be suppressed from two directions, thereby more effectively reducing crosstalk.

[0063] In this embodiment, the first shielding member 26 and the second shielding member 27 are provided in a portion of the connector 1 between the first end 1a and the second end 1b. Crosstalk may occur significantly in a specific portion between the first end 1a and the second end 1b of the connector 1. Therefore, by providing the first shielding member 26 and the second shielding member 27 in the specific portion where crosstalk occurs significantly, crosstalk can be effectively reduced without providing the first shielding member 26 and the second shielding member 27 over the entire area between the first end 1a and the second end 1b.

[0064] Furthermore, the first shielding member 26 and the second shielding member 27 may be provided at a position including the central portion between the first end 1a and the second end 1b. Crosstalk can occur significantly at resonance nodes that occur in the conductor lines that include the eight pairs of plug terminals 18 and socket terminals 22 provided between the first end 1a and the second end 1b. Therefore, by providing the first shielding member 26 and the second shielding member 27 so that they include the central portion that can become a resonance node, crosstalk can be effectively reduced without providing the first shielding member 26 and the second shielding member 27 throughout the entire area between the first end 1a and the second end 1b.

[0065] In addition, in FIG. 5, the distance in the Y direction between the side surfaces of the eight plug terminals 18 and the first shielding member 26 and the distance between the side surfaces of the eight plug terminals 18 and the second shielding member 27 are the same distance a. Here, the distance a and the pitch p of the eight plug terminals 18 may satisfy the following formula: 1 ≦ a / p ≦ 2

[0066] If a / p is smaller than 1, first shielding member 26 and second shielding member 27 may affect eight plug terminals 18. If a / p is greater than 2, there is a risk that the effect of shielding the electromagnetic waves emitted from the eight plug terminals 18 will not be sufficient. By setting a / p to 1 or more and 2 or less, electromagnetic waves radiated from a plurality of conductor lines can be appropriately shielded.

[0067] [Regarding the second embodiment] FIG. 8 is a view showing a part of the plug 12 according to the second embodiment. This embodiment differs from the first embodiment in that the dimensions of the first shielding member 26 and the second shielding member 27 in the X direction are smaller than those of the first shielding member 26 and the second shielding member 27 of the first embodiment. In FIG. 8, the first shielding member 26 is omitted for ease of understanding.

[0068] In this embodiment, the dimensions of the first shielding member 26 in the X direction and the dimensions of the second shielding member 27 in the X direction are smaller than the dimensions of the tip portion 24a in the X direction and the dimensions of the base portion 24b in the X direction.

[0069] The periodic structures 30 of the first shielding member 26 and the second shielding member 27 each have two unit cells 42 arranged in the X direction and five unit cells 42 arranged in the Z direction. Therefore, the periodic structures 30 and 34 of this embodiment each include ten unit cells 42. The periodic structures 30 and 34 have a rectangular shape. The four sides in the X and Z directions of the first shielding member 26 (second shielding member 27) coincide with the four sides in the X and Z directions of the periodic structure 30 (periodic structure 34).

[0070] The first shielding member 26 has a pair of sides 26a and 26b extending along the longitudinal direction (Z direction). Similarly, the second shielding member 27 has a pair of sides 27a and 27b extending along the longitudinal direction.

[0071] When the first shielding member 26 is viewed from the front in the Y direction, the side 26a on the X2 direction side is located on a terminal 18g1 included in the first line T1. The terminal 18g1 on which the side 26a is located is the terminal (first ground line) located on the end side in the X direction of the pair of terminals 18g1 included in the first line T1. The side 26b on the X1 direction side is also located on the terminal 18g2 included in the second line T2. The terminal 18g2 on which the side 26b is located is the terminal located on the end side in the X direction of the pair of terminals 18g2 included in the second line T2.

[0072] Similarly, side 27a of second shielding member 27 is located above terminal 18g1 located at the end side in the X direction when second shielding member 27 is viewed from the front in the Y direction. Side 27b of second shielding member 27 is located above terminal 18g2 located at the end side in the X direction.

[0073] Even in this case, the first shielding member 26 and the second shielding member 27 face at least the side surfaces of the pair of terminals 18s1 and the pair of terminals 18s2. Therefore, the first shielding member 26 and the second shielding member 27 can suppress electromagnetic waves from leaking between the pair of terminals 18s1 and the pair of terminals 18s2.

[0074] [Regarding the third embodiment] FIG. 9 is a view showing a part of the plug 12 according to the third embodiment. This embodiment differs from the first embodiment in that the first shielding member 26 and the second shielding member 27 have portions where the periodic structures 30, 34 are not provided. In FIG. 9, the first shielding member 26 is omitted for ease of understanding.

[0075] The first shielding member 26 has a pair of sides 26a and 26b extending along the longitudinal direction (Z direction). Similarly, the second shielding member 27 has a pair of sides 27a and 27b extending along the longitudinal direction.

[0076] When the first shielding member 26 is viewed from the front in the Y direction, the side 26a on the X2 direction side is aligned along an outer edge 18g11 of a terminal 18g1 included in the first line T1. The terminal 18g1 having the outer edge 18g11 is the terminal located at the end side in the X direction of the pair of terminals 18g1 included in the first line T1. The side 26b on the X1 direction side is located closer to the X1 direction than the second line T2.

[0077] Similarly, side 27a of second shielding member 27 is aligned along outer edge 18g11 of terminal 18g1 located on the X-direction end side when second shielding member 27 is viewed from the front in the Y direction. Side 27b of second shielding member 27 is located closer to the X1 direction than second line T2.

[0078] In each of the periodic structures 30, 34 of the first shielding member 26 and the second shielding member 27 of this embodiment, two unit cells 42 are arranged in the X direction and five unit cells 42 are arranged in the Z direction. Thus, the periodic structures 30, 34 of this embodiment include ten unit cells 42. The periodic structures 30 and 34 have a rectangular shape. The periodic structures 30 and 34 have a pair of structure side portions 30a, 30b, 34a, and 34b along the longitudinal direction (Z direction). The structure side portions 30a and 34a are sides on the X2 direction side. The structure side portions 30b and 34b are sides on the X1 direction side.

[0079] The structural body side 30b (structural body side 34b) coincides with the side 26b (side 27b) of the first shielding member 26 (second shielding member 27). On the other hand, the structure side 30a (structure side 34a) is located closer to the X1 direction than the side 26a (side 27a) of the first shielding member 26 (second shielding member 27). Therefore, the first surface 38a of the dielectric substrate 38 of the first shielding member 26 and the first surface 39a of the dielectric substrate 39 of the second shielding member 27 have regions 26n and 27n where the periodic structure 30 is not provided. The regions 26n and 27n include the dielectric substrates 38 and 39 and the ground conductor plates 32 and 36, but do not include the periodic structures 30 and 34.

[0080] In this embodiment, when the first shielding member 26 and the second shielding member 27 are viewed from the front in the Y direction, the structure side portions 30a, 34a are located closer to the pair of terminals 18s1 than the terminal 18g1 (first ground line) having the outer edge 18g11, and more specifically, are located between the pair of terminals 18s1. In this case, the periodic structures 30, 34 are disposed opposite to the side surfaces of at least one terminal 18s1 (one signal line) of the pair of terminals 18s1 (a pair of signal lines), and therefore, electromagnetic waves radiated from one terminal 18s1 of the pair of terminals 18s1 are blocked by the periodic structures 30, 34. This makes it possible to suppress electromagnetic waves from leaking between the pair of terminals 18s1 and the pair of terminals 18s2.

[0081] In this embodiment, when the first shielding member 26 and the second shielding member 27 are viewed from the front in the Y direction, the structure side portions 30a, 34a only need to be located closer to the pair of terminals 18s1 than the terminal 18g1 having the outer edge 18g11, and if the structure side portion 30a is positioned opposite the side surface of the pair of terminals 18s1, the electromagnetic waves radiated from the pair of terminals 18s1 are shielded by the periodic structures 30, 34.

[0082] [Regarding the fourth and fifth embodiments] FIG. 10 is a view showing a part of the plug 12 according to the fourth and fifth embodiments. In the first embodiment, the plug 12 includes the first shielding member 26 and the second shielding member 27. However, the plug 12 may include either the first shielding member 26 or the second shielding member 27.

[0083] 10(a) shows a part of the plug 12 according to the fourth embodiment. The plug 12 of the fourth embodiment includes a first shielding member 26 but does not include a second shielding member 27. 10(b) shows a part of the plug 12 according to the fifth embodiment. The plug 12 of the fifth embodiment includes a second shielding member 27 but does not include a first shielding member .

[0084] In these embodiments, first shielding member 26 or second shielding member 27 can prevent electromagnetic waves radiated from a pair of terminals 18s1 and a pair of terminals 18s2 included in eight plug terminals 18 from circulating between the pair of terminals 18s1 and the pair of terminals 18s2, thereby reducing crosstalk.

[0085] [Regarding the sixth, seventh, and eighth embodiments] Fig. 11 is a partial cross-sectional view of the plug 12 according to the sixth, seventh and eighth embodiments. Fig. 11 shows a cross section along the YZ plane. In the first embodiment, the first shielding member 26 and the second shielding member 27 of the plug 12 include a dielectric substrate 38 (39), a ground conductor plate 32 (36), a periodic structure 30 (34), and vias 44. However, the first shielding member 26 and the second shielding member 27 may be configured such that some of these components are omitted.

[0086] 11(a) is a partial cross-sectional view of the plug 12 according to the sixth embodiment. The first shielding member 26 and the second shielding member 27 of the sixth embodiment include a dielectric substrate 38 (39), a ground conductor plate 32 (36), and a periodic structure 30 (34), but do not include a via 44. Therefore, the land portion 42a and the strip portion 42b included in the periodic structure 30 (34) are not grounded.

[0087] 11(b) is a partial cross-sectional view of the plug 12 according to the seventh embodiment. The first shielding member 26 and the second shielding member 27 of the seventh embodiment include a dielectric substrate 38 (39) and a ground conductor plate 32 (36), but do not include a periodic structure 30 (34) or a via 44. 11(c) is a partial cross-sectional view of the plug 12 according to the eighth embodiment. The first shielding member 26 and the second shielding member 27 of the eighth embodiment are composed of only the ground conductor plate 32 (36), and do not include the dielectric substrate 38 (39), the periodic structure 30 (34), or the via 44.

[0088] Even in the above configuration, the first shielding member 26 and the second shielding member 27 include at least the grounding conductor plate 32 (36), so that it is possible to prevent the electromagnetic waves radiated from a pair of terminals 18s1 and a pair of terminals 18s2 included in the eight plug terminals 18 from circumventing each other.

[0089] [Regarding the ninth embodiment] Fig. 12 is a diagram showing a part of the plug 12 according to the ninth embodiment. Fig. 13 is a diagram showing a part of the plug 12 as viewed from the Y2 direction. Fig. 14 is a diagram showing the first shielding member 26 according to the ninth embodiment as viewed from the Y2 direction, and is a diagram showing an example of the periodic structure 30.

[0090] In this embodiment, the distance H (see FIG. 1) between the first circuit board 2 and the second circuit board 3 is smaller than that in the first embodiment. The present embodiment is the same as the first embodiment except for the distance H. Therefore, in this embodiment, the distance between the tip portion 24a and the base portion 24b is narrower than that in the first embodiment. Therefore, the length of the eight main body portions 18c of the eight plug terminals 18 is shorter than the length of the eight main body portions 18c of the first embodiment.

[0091] 14, the length of the strip portion 42b is longer by two sides. The widths w2 and w3 and the interval d1 are the same as those in the first embodiment. Therefore, the width w1, which is the dimension of one side of the unit cell 42 included in the periodic structure 30, is relatively larger than the width w1 of the unit cell 42 of the first embodiment. The length of the strip portion 42b can be increased or decreased depending on the dimensions of each portion of the unit cell 42.

[0092] In the periodic structure 30 of the first shielding member 26 of this embodiment, five unit cells 42 are arranged in the X direction, and four unit cells 42 are arranged in the Z direction. Furthermore, since the second shielding member 27 is disposed between the tip portion 24a and the base portion 24b, the dimension in the Z direction is half that of the first shielding member 26. That is, in the periodic structure 30 of the second shielding member 27 of this embodiment, five unit cells 42 are arranged in the X direction, and two unit cells 42 are arranged in the Z direction.

[0093] In this way, even if the size of the first shielding member 26 and the size of the second shielding member 27 are different, it is possible to prevent the electromagnetic waves radiated from some of the eight plug terminals 18 from circumventing each other.

[0094] 〔others〕 It should be noted that the embodiments disclosed herein are to be considered as illustrative in all respects and not restrictive. For example, in each of the above embodiments, the connector 1 includes eight plug terminals 18 and eight socket terminals 22, but the connector 1 may include a greater number of plug terminals 18 and socket terminals 22.

[0095] In the above embodiments, the unit cells 42 included in the periodic structure 30, 34 are all the same size. However, the unit cells included in the periodic structure 30 may include a mixture of unit cells of different sizes. The unit cells included in the periodic structure 30, 34 may include a mixture of unit cells of the same size but with different lengths of the strip-like portions 42b or different spiral directions. Furthermore, the unit cells included in the periodic structure 30, 34 may include a mixture of unit cells 42 lacking the strip-like portions 42b. In addition, when the periodic structure 30, 34 includes a plurality of vias 44, the unit cells included in the periodic structure 30, 34 may include a mixture of unit cells connected to the vias 44 and unit cells not connected to the vias 44.

[0096] Furthermore, in the above-described embodiments, the first shielding member 26 and the second shielding member 27 have the unit cell 42, and the first shielding member 26 and the second shielding member 27 have the periodic structures 30 and 34 each made up of a plurality of unit cells 42. However, the first shielding member 26 and the second shielding member 27 may each be configured to have one unit cell 42.

[0097] Furthermore, in each of the above embodiments, the plug 12 has the first shielding member 26 and the second shielding member 27, but the socket 14 may have the first shielding member 26 and the second shielding member 27, or both the plug 12 and the socket 14 may have the first shielding member 26 and the second shielding member 27, respectively. The scope of the present invention is defined by the claims, not by the meaning described above, and is intended to include meanings equivalent to the claims and all modifications within the scope thereof.

[0098] [About verification testing] Next, a verification test performed on the connector 1 will be described. In the verification test, a model was constructed for each of the following examples and comparative examples, and the characteristics of each of the examples and comparative examples were determined by computer simulation using the model.

[0099] Example 1 The connector 1 shown in the first embodiment was constructed as a model of Example 1. The constructed model also includes a portion of the first circuit board 2 and a portion of the second circuit board 3. A portion of the first circuit board 2 in the constructed model is similar to the portion of the first circuit board 2 shown in Fig. 1. Therefore, in the model, both ends of the first differential transmission line 4 on the Y-direction side and both ends of the second differential transmission line 5 on the Y-direction side are located on both sides of the first circuit board 2 on the Y-direction side. A portion of the second circuit board 3 in the constructed model is similar to the portion of the second circuit board 3 shown in Fig. 1. Therefore, in the model, both ends of the third differential transmission line 6 on the Y-direction side and both ends of the fourth differential transmission line 7 on the Y-direction side are located on both sides of the second circuit board 3 on the Y-direction side. The dimensions of the first shielding member 26, the second shielding member 27 and the related parts in Example 1 were set as follows. Dimension of the first shielding member 26 in the X direction (Z direction): 9 mm Width w1 (Figure 6: dimension of one side of unit cell 42): 1.8 mm Width w2 (Fig. 6: dimension of one side of land portion 42a): 0.5 mm Width w3 (FIG. 6: width dimension of strip portion 42b): 0.1 mm Length L of the strip portion 42b: 14.4 mm Periodic structure material: Copper Spacing d1 (Figure 6: Spacing between strips): 0.1 mm Distance d2 (FIG. 6: distance between the periphery of the unit cell 42 and the strip portion 42b): 0.05 mm Distance a between the plug terminal 18 and the periodic structure 30 (34) (FIG. 5): 1 mm Pitch p of plug terminal 18 (Fig. 2): 0.5 mm Plug terminal 18 width: 0.35mm Distance H (Fig. 1: distance between first circuit board 2 and second circuit board 3): 29 mm

[0100] Example 2 The connector 1 shown in the second embodiment was constructed as a model of Example 2. Therefore, the dimension of the first shielding member 26 in the X direction in Example 2 is 3.6 mm, and the dimension of the first shielding member 26 in the Z direction is 9 mm.

[0101] Example 3 The connector 1 shown in the third embodiment was constructed as a model of Example 3. Example 4 The connector 1 shown in the fourth embodiment was constructed as a model of Example 4. Therefore, the fourth embodiment includes the first shielding member 26 but does not include the second shielding member 27 . Example 5 The connector 1 shown in the fifth embodiment was constructed as a model of Example 5. Therefore, Example 5 includes the second shielding member 27 but does not include the first shielding member 26 . Example 6 The connector 1 shown in the sixth embodiment was constructed as a model of Example 6. Example 7 The connector 1 shown in the seventh embodiment was constructed as a model of Example 7. Example 8 The connector 1 shown in the eighth embodiment was constructed as a model of Example 8.

[0102] Example 9 The connector 1 shown in the ninth embodiment was constructed as a model of Example 9. Among the dimensions of the first shielding member 26, the second shielding member 27, and the respective related parts in Example 1, the following values ​​were set to different values. Items not shown below are the same as those in the first embodiment. Dimension of the first shielding member 26 in the X direction: 10.5 mm Dimension of the first shielding member 26 in the Z direction: 8.4 mm Dimension of second shielding member 27 in the X direction: 4.2 mm Z-direction dimension of second shielding member 28: 8.4 mm Length L of the strip portion 42b: 18.35 mm Spacing d1 (Figure 6: Spacing between strips): 0.1 mm Distance d2 (FIG. 6: distance between the periphery of the unit cell 42 and the strip portion 42b): 0.1 mm Distance a between the plug terminal 18 and the periodic structure 30 (34) (FIG. 5): 1 mm Pitch p of plug terminal 18 (Fig. 2): 0.5 mm Plug terminal 18 width: 0.35mm Distance H (FIG. 1: distance between first circuit board 2 and second circuit board 3): 25 mm

[0103] Comparison Example 1 A model of Comparative Example 1 was constructed by removing the first shielding member 26 and the second shielding member 27 from Example 1.

[0104] Comparison Example 2 A model of Comparative Example 2 was constructed by removing the first shielding member 26 and the second shielding member 27 from Example 9.

[0105] Comparison between Example 1 and Comparative Example 1 The S parameters S21, S41, and S31 were calculated when the line end of the first differential transmission line 4 was defined as port 1, the line end of the third differential transmission line 6 was defined as port 2, the line end of the second differential transmission line 5 was defined as port 3, and the line end of the fourth differential transmission line 7 was defined as port 4.

[0106] Fig. 15 is a graph showing the frequency characteristics of S21 for Example 1 and Comparative Example 1. In Fig. 15, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S21. In Fig. 15, the solid line represents the graph for Example 1, and the dashed line represents the graph for Comparative Example 1. 15, there is no significant difference between S21 of Example 1 and S21 of Comparative Example 1. S21 indicates the pass characteristics of the input signal. Therefore, from this result, it can be confirmed that the first shielding member 26 and the second shielding member 27 do not affect the input signal.

[0107] Fig. 16 is a graph showing the frequency characteristics of S41 for Example 1 and Comparative Example 1. In Fig. 16, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 16, the solid line represents the graph for Example 1, and the dashed line represents the graph for Comparative Example 1. The S parameter S41 represents far-end crosstalk. 16, peaks appear around 3 GHz, 6 GHz, 9 GHz, 12 GHz, and 15 GHz in Comparative Example 1. These peaks correspond to resonance frequencies determined according to the line length of connector 1. In contrast to this, in Example 1, each peak is suppressed and the range of change with respect to frequency is suppressed. As a result, in Example 1, an overall reduction in crosstalk is observed compared to Comparative Example 1. Furthermore, for example, when the target value of S41 for crosstalk reduction is set to -40 dB, the peak portion of S41 in the range of 10 GHz or less exceeds the target value in the range of 10 GHz or less in Comparative Example 1. In contrast, the target value is met in the range of 10 GHz or less in S41 in Example 1, and it is found that crosstalk is reduced.

[0108] Fig. 17 is a graph showing the frequency characteristics of S31 for Example 1 and Comparative Example 1. In Fig. 17, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S31. In Fig. 17, the solid line represents the graph for Example 1, and the dashed line represents the graph for Comparative Example 1. The S parameter S31 represents near-end crosstalk. As shown in FIG. 17, in the near-end crosstalk as well, in Comparative Example 1, peaks appear near 3 GHz, 6 GHz, 9 GHz, 12 GHz, and 15 GHz. In contrast to this, in Example 1, each peak is suppressed, and a reduction in crosstalk is observed overall compared to Comparative Example 1. Furthermore, when the target value of S31 for crosstalk reduction is set to -40 dB, the peak portion of S31 in the range of 10 GHz or less exceeds the target value in the comparative example 1. In contrast, the target value is met in the range of 10 GHz or less in the example 1, and it is found that crosstalk is reduced.

[0109] Fig. 18 is a diagram showing an example of the electric field distribution in the XY plane in Comparative Example 1. Fig. 19 is a diagram showing an example of the electric field distribution in the XY plane in Example 1. The electric field distribution shown in Fig. 19 is the XY plane shown in Fig. 5, and is the electric field distribution in the portion where the first shielding member 26 and the second shielding member 27 are provided in Example 1. In Fig. 19, the periodic structure 30 and the ground conductor plate 32 of the first shielding member 26, and the periodic structure 34 and the ground conductor plate 36 of the second shielding member 27 are indicated by straight lines. The electric field distribution shown in FIG. 18 is at the same position as in the first embodiment. In Figures 18 and 19, darker colors indicate stronger electric fields, and lighter colors indicate weaker electric fields.

[0110] As shown in FIG. 18, among the eight plug terminals 18, there is a region where a strong electric field is present between a terminal 18g1 of the first line T1 and a terminal 18g2 of the second line T2 that are adjacent to each other. 19 according to Example 1, it can be seen that the electric field intensity is reduced in the region between terminal 18g1 and terminal 18g2. In other words, it can be seen that the coupling between terminal 18g1 and terminal 18g2 is reduced, and crosstalk is reduced.

[0111] Fig. 20 is a graph showing the frequency characteristics of S41 when the distance a (Fig. 5) is changed in Example 1. In Fig. 20, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In FIG. 20, the solid line indicates the graph when the distance a is 1 mm, and the broken line indicates the graph when the distance a is 1.2 mm. 20, when the distance a is 1.2 mm, the peak near 3 GHz is higher than when the distance a is 1 mm. This peak near 3 GHz exceeds the target value of -40 dB. Therefore, it is clear that a distance a of 1 mm or less is preferable.

[0112] Fig. 21 is a graph showing the frequency characteristics of S41 when the distance a is changed in Example 1. In Fig. 21, the solid line shows the graph when the distance a is 0.4 mm, and the dashed line shows the graph when the distance a is 0.5 mm. 21, when the distance a is 0.4 mm, the peak near 3 GHz is higher than when the distance a is 0.5 mm. This peak near 3 GHz exceeds the target value of -40 dB. Therefore, it is clear that a distance a of 0.5 mm or more is preferable. The pitch p in Example 1 is 0.5 mm. Therefore, it is clear that a / p is preferably 1 or more and 2 or less.

[0113] Fig. 22 is a graph showing the frequency characteristics of S41 when the periodic structures 30 and 34 of Example 1 are formed from nickel. In Fig. 22, the dashed line shows the graph when nickel is used for the periodic structures, and the solid line shows the graph for Example 1. As shown in FIG. 22, even when the periodic structures 30, 34 are made of nickel, S41 is equal to or less than the target value of −40 dB in the range of 10 GHz or less, and it is clear that crosstalk is reduced.

[0114] About Example 2 Fig. 23 is a graph showing the frequency characteristics of S41 in Example 2. In Fig. 23, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 23, the solid line represents the graph for Example 2, and the dashed line represents the graph for Example 1. In Example 2 as well, S41 is equal to or less than the target value of −40 dB in the range of 10 GHz or less, and it is clear that crosstalk is reduced.

[0115] About Example 3 Fig. 24 is a graph showing the frequency characteristics of S41 in Example 3. In Fig. 24, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 24, the dashed line represents the graph for Example 3, and the solid line represents the graph for Example 1. In Example 3 as well, S41 is equal to or less than the target value of −40 dB in the range of 10 GHz or less, and it is clear that crosstalk is reduced.

[0116] Regarding Examples 4 and 5 Fig. 25 is a graph showing the frequency characteristics of S41 in Examples 4 and 5. In Fig. 25, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 25, the dashed line represents the graph for Example 4, the two-dot chain line represents the graph for Example 5, and the solid line represents the graph for Example 1. In Examples 4 and 5, crosstalk is reduced overall, similar to Example 1. In particular, S41 is below the target value of -40 dB in the range of 10 GHz or less, indicating that crosstalk is reduced.

[0117] Regarding Examples 6, 7, and 8 Fig. 26 is a graph showing the frequency characteristics of S41 for Examples 6, 7, and 8. In Fig. 26, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 26, the dashed line represents the graph for Example 6, the two-dot chain line represents the graph for Example 7, the one-dot chain line represents the graph for Example 8, and the solid line represents the graph for Example 1. In Examples 6, 7, and 8, S41 is also equal to or less than the target value of −40 dB in the range of 10 GHz or less, and it is clear that crosstalk is reduced.

[0118] Example 9 Fig. 27 is a graph showing the frequency characteristics of S41 in Comparative Example 1 and Comparative Example 2. In Fig. 27, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 27, the dashed line represents the graph for Comparative Example 1, and the solid line represents the graph for Comparative Example 2. 28 is a graph showing the frequency characteristics of S31 for Comparative Example 1 and Comparative Example 2. In Fig. 28, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S31. In Fig. 28, the dashed line represents the graph for Comparative Example 1, and the solid line represents the graph for Comparative Example 2.

[0119] The gap H (FIG. 1) in Comparative Example 2 is 4 mm shorter than the gap H in Comparative Example 1. Therefore, the line length of the connector 1 in Comparative Example 2 is 4 mm shorter than the line length of the connector 1 in Comparative Example 1.

[0120] In the graphs of S41 and S31, peaks appear according to the resonance frequencies determined according to the line lengths of the connector 1. From S41 and S31 of Comparative Example 2, it can be seen that the resonant frequency of Comparative Example 2 is higher than the resonant frequency of Comparative Example 1 due to the shortened line length of the connector 1.

[0121] Fig. 29 is a graph showing the frequency characteristics of S41 in Example 9. In Fig. 29, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S41. In Fig. 29, the dashed line represents the graph for Example 9, and the solid line represents the graph for Comparative Example 2. 30 is a graph showing the frequency characteristics of S31 in Example 9. In Fig. 30, the horizontal axis represents the frequency of the transmission signal, and the vertical axis represents S31. In Fig. 30, the dashed line represents the graph for Example 9, and the solid line represents the graph for Comparative Example 2. In Example 9 as well, S41 and S31 are equal to or less than the target value of −40 dB in the range of 10 GHz or less, and it is clear that crosstalk is reduced.

[0122] Characteristics of periodic structures Next, the characteristics of the periodic structure of Example 1 for attenuating electromagnetic waves in a predetermined frequency band will be described. Fig. 31 is a diagram for explaining an incident wave to the first shielding member 26 of Example 1. Fig. 31 shows a state in which an incident wave in a TM (Transverse Magnetic) mode is incident on the periodic structure of the shielding member at an incident angle θ. Here, as shown in FIG. 31, the reflection loss when an incident wave in TM mode is incident on the shielding member at an incident angle θ was obtained by computer simulation.

[0123] Fig. 32 is a graph showing the frequency characteristics of the reflection loss when an incident wave is made incident on the first shielding member 26 of Example 1. Fig. 32 shows the frequency characteristics of the reflection loss for incident angles of 10 degrees each between 0 degrees and 80 degrees. As shown in FIG. 32, the reflection characteristics of the first shielding member 26 of Example 1 show a frequency band in which the reflected wave is significantly attenuated.

[0124] Fig. 33 is an enlarged view of the band near 4.74 GHz in Fig. 32. Fig. 34 is an enlarged view of the band near 11.4 GHz in Fig. 32. Fig. 35 is an enlarged view of the band near 17.5 GHz in Fig. 32.

[0125] The width w1, which is the dimension of one side of the unit cell 42 of the periodic structure 30 in Example 1, is 1.8 mm, and the length of the strip portions 42b is 14.4 mm. The resonant frequencies of the strip portions 42b in Example 1 are 4.74 GHz, 11.4 GHz, and 17.5 GHz. That is, in the reflection characteristics of the first shielding member 26 of the first embodiment, a frequency band in which the reflected wave is significantly attenuated appears near the resonance frequency of the strip-shaped portion 42b.

[0126] As described above, it is understood that the periodic structure 30 (unit cell 42) of Example 1 has the property of attenuating electromagnetic waves in a predetermined frequency band among incident waves, and functions as a resonant element.

[0127] Fig. 36 is a graph showing the frequency characteristics of the reflection loss when an incident wave is made incident on the first shielding member 26 of Example 9. Fig. 36 shows the frequency characteristics of the reflection loss for incident angles in increments of 10 degrees between the incident angles of 0 degrees and 80 degrees. In FIG. 36, similarly to FIG. 32, the reflection characteristics of the first shielding member 26 of Example 9 show a frequency band in which the reflected wave is significantly attenuated.

[0128] The width w1, which is the dimension of one side of the unit cell 42 of the periodic structure 30 of Example 9, is 2.1 mm, and the length of the strip portions 42b is 18.35 mm. The resonant frequencies of the strip portions 42b of Example 9 are 3.3 GHz, 8.75 GHz, and 14.3 GHz. In the reflection characteristics of the first shielding member 26 of Example 9, a frequency band where the reflected wave is significantly attenuated appears near the resonance frequency of the strip portion 42b.

[0129] The strip portion 42b of Example 9 is longer than the strip portion 42b of Example 1. Therefore, by adjusting the length of the strip portion 42b, it is possible to adjust the frequency band in which electromagnetic waves can be attenuated. Therefore, for example, it is possible to adjust the resonant frequency occurring between the first end 1a and the second end 1b of the connector 1 so that it is included in the frequency band in which electromagnetic waves can be attenuated by the periodic structure (unit cell 42). In other words, by appropriately designing each part, including the length of the strip-shaped part 42b, the resonant frequency of the connector 1 can be included in the frequency band in which electromagnetic waves can be attenuated by the periodic structure. [Explanation of symbols]

[0130] 1 connector 1a 1st end 1b Second end 2 1st circuit board 3 Second circuit board 4. First differential transmission line 4a Signal line 5 Second differential transmission line 5a signal line 6 Third differential transmission line 6a Signal line 7 Fourth differential transmission line 7a signal line 8 Grounding conductor 9 Grounding conductor 10 Via 12 plugs 14 sockets 16 Plug housing 18 Plug terminal 18a Connection end 18b Contact piece 18c Main body 18g1 terminal 18g11 outer edge 18g2 terminal 18s1 terminal 18s2 terminal 20 Socket Housing 22 Socket terminal 22a Connection end 22b Contact piece 22c Main body 24 Housing body 24a Tip (connection end) 24b Base (board side end) 24c middle part 24c1 External surface 24c2 External surface 24c3 Slots 26 First shielding member 26a Edge 26b Edge 26n area 27 Second shielding member 27a Edge 27b Edge 27n area 28 Second shielding member 30 Periodic structure 30a Structure side 30b Structure edge 32 Ground conductor plate 34 Periodic structure 34a Structure edge 34b Structure edge 36 Ground conductor plate 38 Dielectric Substrate 38a 1st page 38b 2nd side 39 Dielectric Substrate 39a 1st page 39b 2nd side 42 unit cells 42a Land Section 42b Belt 44 Beer T1 First Track T2 Second Track a distance d1 interval d2 interval H interval p pitch w1 width w2 width w3 width θ angle of incidence

Claims

1. a signal transmission line having a first end connected to a first differential transmission line and a second differential transmission line, a plurality of conductor lines having a plurality of connection ends connected to the first differential transmission line and the second differential transmission line on the first end side; a holding section that holds the plurality of conductor lines in an arrangement along a predetermined arrangement direction; a first shielding member that is disposed opposite a side surface of the plurality of conductor lines along the arrangement direction and that shields electromagnetic waves radiated from the plurality of conductor lines; Signal transmission line.

2. a second shielding member disposed opposite the first shielding member across the plurality of conductor lines, the second shielding member blocking electromagnetic waves radiated from the plurality of conductor lines; The signal transmission line according to claim 1 .

3. The first shielding member is provided in a portion between the first end and a second end opposite the first end in the direction in which the plurality of conductor lines extend. The signal transmission line according to claim 1 .

4. The first shielding member is provided at a position including a central portion between the first end and a second end opposite to the first end in the direction in which the plurality of conductor lines extend. The signal transmission line according to claim 1 .

5. The plurality of conductor lines include: a pair of signal lines connected to the first differential transmission line; a pair of ground lines arranged on both sides of the pair of signal lines, a first ground line of the pair of ground lines is located at an end of the plurality of conductor lines in an arrangement direction; the first shielding member has a rectangular plate shape having a pair of sides extending along a direction in which the plurality of conductor lines extend, When the first shielding member is viewed from the front, one of the pair of sides closer to the end is located on the first ground line. The signal transmission line according to claim 1 .

6. The first shielding member includes a rectangular ground conductor plate. The signal transmission line according to claim 1 .

7. The first shielding member is a rectangular dielectric substrate having a first surface facing the plurality of conductor lines and a second surface opposite to the first surface; a ground conductor plate laminated on the second surface. The signal transmission line according to claim 1 .

8. The first shielding member further includes one or more unit cells including a predetermined conductor pattern provided on the first surface. The signal transmission line according to claim 7.

9. The first shielding member further has a periodic structure in which a plurality of unit cells, each including a predetermined conductor pattern, are periodically arranged on the first surface. The signal transmission line according to claim 7.

10. The periodic structure further includes a plurality of vias that penetrate the dielectric substrate and connect the plurality of unit cells to the ground conductor plate. The signal transmission line according to claim 9.

11. The plurality of conductor lines include: a pair of signal lines connected to the first differential transmission line; a pair of ground lines arranged on both sides of the pair of signal lines, a first ground line of the pair of ground lines is located at an end of the plurality of conductor lines in an arrangement direction; the periodic structure has a rectangular shape having a pair of structure sides along a longitudinal direction, When the first shielding member is viewed from the front, one of the pair of structure sides on the end side is located closer to the pair of signal lines than the first ground line. The signal transmission line according to claim 10.

12. When the first shielding member is viewed from the front, the structure side on the end side is located between the pair of signal lines. The signal transmission line according to claim 11.

13. When the distance between the side surfaces of the plurality of conductor lines and the periodic structure is a and the pitch of the plurality of conductor lines in the arrangement direction is p, the following formula is satisfied: The signal transmission line according to any one of claims 9 to 12. 1≦a / p≦2

14. the predetermined conductor pattern included in the unit cell has a characteristic of attenuating electromagnetic waves in a predetermined frequency band among incident waves, A resonance frequency occurring between the first end and a second end opposite to the first end is included in the predetermined frequency band. The signal transmission line according to any one of claims 8 to 12.

15. A connector having a substrate-side end portion to which a first differential transmission path and a second differential transmission path provided on a substrate are connected, and a connection-side end portion to which a connected portion is connected, a plurality of linear terminals having a plurality of connection ends connected to the first differential transmission path and the second differential transmission path at the substrate side end, and having a plurality of contact piece portions at the connection side end that can come into contact with terminals of the connected part; a holding portion that holds the plurality of terminals in an array along a predetermined array direction; a first shielding member that is disposed opposite a side surface of the plurality of terminals along the arrangement direction and that shields electromagnetic waves radiated from the plurality of terminals; connector.

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