WO2023085177A1 - Multilayer board - Google Patents

Abstract

A plurality of first linear conductors are positioned above signal conductors. A plurality of second linear conductors are positioned below the signal conductors. The plurality of first linear conductors and the plurality of second linear conductors cross the signal conductors when viewed in the vertical direction. The plurality of second linear conductors extend along the plurality of first linear conductors when viewed in the vertical direction. When viewed in the vertical direction, at least a portion of any one second linear conductor among the plurality of second linear conductors overlaps with each of a plurality of first regions positioned between two adjacent first linear conductors. When viewed in the vertical direction, at least a portion of any one first linear conductor among the plurality of first linear conductors overlaps with each of a plurality of second regions positioned between two adjacent second linear conductors.

Description

multilayer board

The present invention relates to a multilayer substrate with signal conductors.

For example, the device described in Patent Document 1 is known as an invention related to conventional multilayer substrates. The device includes a plurality of conductors, a plurality of first slotted stationary strips and a plurality of second slotted stationary strips. The multiple conducting wires extend in the front-rear direction. A plurality of first slotted stationary strips are positioned above the plurality of conductors. A plurality of first slotted stationary strips extend in the left-right direction. A plurality of second slotted stationary strips are positioned below the plurality of conductors. A plurality of second slotted stationary strips extend in the left-right direction. Also, the plurality of second slot type immovable strips overlap the plurality of first slot type immovable strips when viewed in the vertical direction.

Japanese Patent No. 5042327 (Fig. 12)

By the way, in the device described in Patent Document 1, there is a demand to suppress variations in characteristic impedance that occur in a plurality of conducting wires.

Accordingly, an object of the present invention is to provide a multilayer substrate capable of suppressing variations in characteristic impedance occurring in signal lines.

A multilayer substrate according to one aspect of the present invention comprises
A multilayer substrate,
a laminate having a structure in which a plurality of insulator layers are stacked vertically;
a signal conductor provided in the laminate and having a linear shape;
a plurality of first linear conductors provided in the laminate, positioned above the signal conductor, and crossing the signal conductor when viewed in the vertical direction;
a plurality of second linear conductors provided in the laminate, positioned below the signal conductor, and crossing the signal conductor when viewed in the vertical direction;
and
The plurality of second linear conductors extend along the plurality of first linear conductors when viewed in the vertical direction,
Any one of the plurality of second linear conductors is provided in each of the plurality of first regions positioned between the two adjacent first linear conductors when viewed in the vertical direction. at least a portion of the conductors overlap, and
Any one of the plurality of first linear conductors is provided in each of the plurality of second regions positioned between the two adjacent second linear conductors when viewed in the vertical direction. at least a portion of the conductors overlap, and
It has the structure (A) or (B).
(A)
The multilayer substrate is
one or more external electrodes provided on the laminate and electrically connected to an external circuit;
one or more ground conductors;
It is also equipped with
The plurality of first linear conductors and the plurality of second linear conductors are not DC-coupled to any of the one or more external electrodes,
A section in which the signal conductor crosses the plurality of first linear conductors or the plurality of second linear conductors is defined as an intersection section,
the signal conductor does not overlap the one or more ground conductors in the cross section;
each of the plurality of first linear conductors overlaps a part of the one or more ground conductors when viewed in the vertical direction;
Each of the plurality of second linear conductors overlaps a part of the one or more ground conductors when viewed in the vertical direction.
(B)
The plurality of first linear conductors and the plurality of second linear conductors are connected to a ground potential.

According to the multilayer substrate of the present invention, it is possible to suppress fluctuations in characteristic impedance that occur in signal lines.

FIG. 1 is an exploded perspective view of a multilayer substrate 10. FIG. FIG. 2 is a cross-sectional view of the multilayer substrate 10. As shown in FIG. FIG. 3 is a rear view of the multilayer substrate 10 in a bent state. FIG. 4 is a cross-sectional view of the multilayer substrate 10a. FIG. 5 is a cross-sectional view of the multilayer substrate 10b. FIG. 6 is a cross-sectional view of the multilayer substrate 10c. FIG. 7 is a cross-sectional view of the multilayer substrate 10d. FIG. 8 is a cross-sectional view of the multilayer substrate 10e. FIG. 9 is a cross-sectional view of the multilayer substrate 10f. FIG. 10 is an exploded perspective view of the multilayer substrate 10g. FIG. 11 is an exploded perspective view of the multilayer substrate 10h. FIG. 12 is an exploded perspective view of the multilayer substrate 10i. FIG. 13 is an exploded perspective view of the multilayer substrate 10j. FIG. 14 is an exploded perspective view of the multilayer substrate 10k. FIG. 15 is an exploded perspective view of the multilayer substrate 10l. FIG. 16 is an exploded perspective view of the multilayer substrate 10m.

(embodiment)
[Structure of multilayer substrate 10]
The structure of the multilayer substrate 10 according to the embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a multilayer substrate 10. FIG. FIG. 2 is a cross-sectional view of the multilayer substrate 10. As shown in FIG. In FIGS. 1 and 2, only representative first linear conductors 26 and representative second linear conductors 28 among the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are denoted by reference numerals. attached. FIG. 3 is a rear view of the multilayer substrate 10 in a bent state.

In this specification, directions are defined as follows. The stacking direction of the laminate 12 of the multilayer substrate 10 is the vertical direction. Further, the direction in which the signal conductors 20 of the multilayer substrate 10 extend is the left-right direction. Further, the line width direction of the signal conductors 20 of the multilayer substrate 10 is the front-rear direction. In this specification, the line width direction is a direction orthogonal to the direction in which the conductor extends when viewed in the vertical direction. The up-down direction, the front-rear direction, and the left-right direction are orthogonal to each other. The vertical direction, the front-rear direction, and the left-right direction in this specification do not have to correspond to the vertical direction, the front-rear direction, and the left-right direction when the multilayer substrate 10 is actually used.

The definitions of terms used in this specification are explained below. First, the positional relationship of the members in this specification will be defined. X to Z are members or parts that constitute the multilayer substrate 10 . In this specification, "X and Y are electrically connected" means that electricity can be conducted between X and Y. Therefore, X and Y may be in contact, or X and Y may not be in contact. If X and Y are not in contact, a conductive Z is placed between X and Y. On the other hand, in this specification, "X and Y are connected" means that X and Y are connected while being in contact with each other.

In the following, X is a part or member of the multilayer substrate 10. In this specification, unless otherwise specified, each part of X is defined as follows. By front of X is meant the front half of X. Back of X means the back half of X. The left part of X means the left half of X. The right part of X means the right half of X. Top of X means the top half of X. The lower part of X means the lower half of X. The leading edge of X means the leading edge of X. The trailing end of X means the trailing end of X. The left end of X means the end of X in the left direction. The right end of X means the end of X in the right direction. The upper end of X means the end of X in the upward direction. The lower end of X means the lower end of X. The front end of X means the front end of X and its vicinity. The rear end of X means the rear end of X and its vicinity. The left end of X means the left end of X and its vicinity. The right end of X means the right end of X and its vicinity. The upper end of X means the upper end of X and its vicinity. The lower end of X means the lower end of X and its vicinity.

In this specification, the state that X extends along Y includes the state in which X is parallel to Y and the state in which X is slightly inclined with respect to Y. Further, the state that X extends in the left-right direction includes the state in which X is parallel to the left-right direction and the state in which X is slightly inclined with respect to the left-right direction. "Slightly tilted" means that X is tilted within a range of ±10 degrees with respect to the Y axis or the horizontal direction. The same applies to directions other than the left-right direction.

First, the structure of the multilayer substrate 10 will be described with reference to FIG. The multilayer substrate 10 transmits high frequency signals. A multilayer substrate 10 is used to electrically connect two circuits in an electronic device such as a smart phone. As shown in FIG. 1, the multilayer substrate 10 has a strip shape extending in the left-right direction.

As shown in FIG. 1, the multilayer substrate 10 includes a laminate 12, a signal conductor 20, first ground conductors 22a and 22b, ground conductors 24a, 24b, 25a and 25b, a plurality of first linear conductors 26, and a plurality of second ground conductors 22a and 22b. It has two linear conductors 28, external electrodes 30a, 30b, 32a, 32b, 34a, 34b and interlayer connection conductors v1 to v6.

The laminate 12 has a plate shape, as shown in FIG. Therefore, the laminated body 12 has an upper principal surface and a lower principal surface which are aligned in the vertical direction. Moreover, as shown in FIG. 1, the laminated body 12 has a structure in which a protective layer 16 and insulating layers 14a to 14e are laminated vertically. The protective layer 16 and the insulator layers 14a to 14e are arranged in this order from top to bottom. The insulator layers 14a to 14e have the same strip shape as the laminate 12 when viewed in the vertical direction. The insulator layers 14a-14e are flexible dielectric sheets. The material of the insulator layers 14a to 14e is resin. In this embodiment, the material of the insulator layers 14a to 14e is thermoplastic resin. The thermoplastic resin is, for example, liquid crystal polymer, PTFE (polytetrafluoroethylene), or the like. Also, the material of the insulator layers 14a to 14e may be polyimide. Thereby, the laminated body 12 has flexibility.

The signal conductor 20 is provided on the laminate 12 as shown in FIG. More specifically, signal conductor 20 is located on the upper major surface of insulator layer 14c. The signal conductor 20 has a linear shape. The signal conductor 20 extends in the left-right direction.

The external electrodes 30a, 30b, 32a, 32b, 34a, 34b are electrically connected to an external circuit (not shown). The external circuit is an electric circuit provided outside the multilayer substrate 10 . The external electrodes 30 a , 30 b , 32 a , 32 b , 34 a and 34 b are provided on the laminate 12 . More specifically, the external electrodes 30a, 32a, 34a are located near the left end of the upper main surface of the insulator layer 14a. The external electrodes 32a, 30a, 34a are arranged in this order from front to back. The external electrodes 30b, 32b, 34b are located near the right end of the upper main surface of the insulator layer 14a. The external electrodes 32b, 30b, 34b are arranged in this order from front to back. The external electrodes 30a, 30b, 32a, 32b, 34a, 34b have a rectangular shape when viewed in the vertical direction. Connectors (not shown) are soldered to the external electrodes 30a, 30b, 32a, 32b, 34a, and 34b. This connector is connected to a connector on a circuit board (not shown). Thereby, the multilayer board 10 and the circuit board (not shown) are electrically connected. Note that the multilayer board 10 may be connected to the circuit board by surface mounting without using a connector.

The interlayer connection conductor v1 penetrates the insulator layers 14a and 14b in the vertical direction. The interlayer connection conductor v 1 electrically connects the external electrode 30 a and the left end of the signal conductor 20 . The interlayer connection conductor v2 penetrates the insulator layers 14a and 14b in the vertical direction. The interlayer connection conductor v2 electrically connects the external electrode 30b and the right end of the signal conductor 20 .

The plurality of first linear conductors 26 are provided on the laminate 12 as shown in FIG. More specifically, the plurality of first linear conductors 26 are positioned above the signal conductors 20 . The plurality of first linear conductors 26 are provided at the same position in the vertical direction. In this embodiment, the plurality of first linear conductors 26 are located on the upper main surface of the insulator layer 14b. The multiple first linear conductors 26 have a linear shape. The plurality of first linear conductors 26 intersect the signal conductors 20 when viewed in the vertical direction. In this embodiment, the plurality of first linear conductors 26 extend in the front-rear direction. Therefore, the plurality of first linear conductors 26 are orthogonal to the signal conductors 20 when viewed in the vertical direction. The plurality of first linear conductors 26 as described above are arranged in the direction in which the signal conductors 20 extend.

The plurality of second linear conductors 28 are provided on the laminate 12 as shown in FIG. More specifically, the plurality of second linear conductors 28 are positioned below the signal conductors 20 . The plurality of second linear conductors 28 are provided at the same position in the vertical direction. In this embodiment, the plurality of second linear conductors 28 are located on the upper main surface of the insulator layer 14d. The plurality of second linear conductors 28 have a linear shape. The plurality of second linear conductors 28 intersect the signal conductors 20 when viewed in the vertical direction. In this embodiment, the plurality of second linear conductors 28 extend in the front-rear direction. Therefore, the plurality of second linear conductors 28 are perpendicular to the signal conductors 20 when viewed in the vertical direction. Also, the plurality of second linear conductors 28 extend along the plurality of first linear conductors 26 when viewed in the vertical direction. In this embodiment, the plurality of second linear conductors 28 are parallel to the plurality of first linear conductors 26 when viewed in the vertical direction. The plurality of second linear conductors 28 as described above are arranged in the direction in which the signal conductors 20 extend.

The plurality of first linear conductors 26 and the plurality of second linear conductors 28 are floating conductors. The potential of the floating conductor is the floating potential. The floating conductor is not connected to ground potential and power supply potential. Therefore, the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are DC-coupled to none of the external electrodes 30a, 30b, 32a, 32b, 34a, 34b. More precisely, the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are not DC-coupled to any external electrodes provided on the multilayer substrate 10 . Two conductors are not galvanically coupled means that no direct current can flow between the two conductors.

High-frequency signals are input to and output from the external electrodes 30a and 30b as described above. The external electrodes 32a, 32b, 34a, 34b are connected to ground potential.

Here, the positional relationship between the plurality of first linear conductors 26 and the plurality of second linear conductors 28 will be described. As shown in FIGS. 1 and 2, a plurality of regions located between two adjacent first linear conductors 26 are defined as a plurality of first regions A1. A plurality of regions located between two adjacent second linear conductors 28 are defined as a plurality of second regions A2. Each of the plurality of first regions A1 and the plurality of second regions A2 has a rectangular shape. In the present embodiment, the plurality of first regions A1, the plurality of second regions A2, the plurality of first linear conductors 26, and the plurality of second linear conductors 28 have the same shape when viewed in the vertical direction. there is Accordingly, the line width W1 of the plurality of first linear conductors 26 is half the period T1 of the arrangement of the plurality of first linear conductors 26. As shown in FIG. The line width W2 of the plurality of second linear conductors 28 is half the period T2 of the arrangement of the plurality of second linear conductors 28 . The line width W1 is equal to the line width W2. Period T1 is equal to period T2.

At least a portion of one of the plurality of second linear conductors 28 overlaps with each of the plurality of first regions A1 when viewed in the vertical direction. In addition, when viewed in the vertical direction, at least a portion of any one of the plurality of first linear conductors 26 overlaps with each of the plurality of second regions A2. As a result, the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are arranged alternately in the direction in which the signal conductors 20 extend when viewed in the vertical direction. In the present embodiment, the centers C1 in the line width direction of the plurality of first linear conductors 26 do not overlap the centers C2 in the line width direction of the plurality of second linear conductors 28, respectively. Further, the centers C11 in the left-right direction of the plurality of first regions A1 do not overlap the centers C12 in the left-right direction of the plurality of second regions A2. The horizontal direction is the line width direction of the first linear conductor 26 or the line width direction of the second linear conductor 28 .

However, the center C1 in the line width direction of the plurality of first linear conductors 26 overlaps the center C12 in the line width direction of the plurality of second regions A2. Each of the centers C2 in the line width direction of the plurality of second linear conductors 28 overlaps the centers C11 in the line width direction of the plurality of first regions A1. Thus, when viewed in the vertical direction, the plurality of first linear conductors 26 are adjacent to each other so as to be in contact with the second linear conductors 28 located on the left and the second linear conductors 28 located on the right. When viewed in the vertical direction, the plurality of second linear conductors 28 are adjacent to each other so as to be in contact with the first linear conductor 26 located on the left and the first linear conductor 26 located on the right. In other words, the multiple first linear conductors 26 do not overlap the multiple second linear conductors 28 when viewed in the vertical direction. When viewed in the vertical direction, there are no gaps between the plurality of first linear conductors 26 and the plurality of second linear conductors 28 . However, the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are provided at different positions in the vertical direction. Therefore, the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are not actually in contact with each other.

Here, as shown in FIG. 2, in the multilayer substrate 10, the section where the signal conductor 20 intersects the plurality of first linear conductors 26 or the plurality of second linear conductors 28 is defined as an intersection section A22. In the multilayer substrate 10, sections in which the signal conductor 20 does not cross the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are defined as non-crossing sections A21 and A23. The non-crossing section A21, the crossing section A22, and the non-crossing section A23 are arranged in this order from left to right.

As shown in FIG. 1, the line width w2 of the signal conductor 20 in the crossing section A22 is thicker than the line width w1 of the signal conductor 20 in the non-crossing section A21 and the line width w3 of the signal conductor 20 in the non-crossing section A23.

The ground conductor 24a is provided on the laminate 12 as shown in FIG. More specifically, the ground conductor 24a is provided near the left end of the upper main surface of the insulator layer 14a. Therefore, the ground conductor 24a is located in the non-intersecting section A21. The ground conductor 24a has a rectangular shape when viewed in the vertical direction by being combined with the external electrodes 32a and 34a. The ground conductor 24 a is positioned above the signal conductor 20 . The ground conductor 24a overlaps the signal conductor 20 in the non-intersecting section A21 when viewed in the vertical direction. However, the ground conductor 24a does not overlap the plurality of first linear conductors 26 and the plurality of second linear conductors 28 when viewed in the vertical direction.

The ground conductor 24b is provided on the laminate 12 as shown in FIG. More specifically, the ground conductor 24b is provided near the right end of the upper main surface of the insulator layer 14a. Therefore, the ground conductor 24b is located in the non-intersecting section A23. The ground conductor 24b is combined with the external electrodes 32b, 34b to have a rectangular shape when viewed in the vertical direction. The ground conductor 24b is located above the signal conductor 20. As shown in FIG. The ground conductor 24b overlaps the signal conductor 20 in the non-crossing section A23 when viewed in the vertical direction. However, the ground conductor 24b does not overlap the plurality of first linear conductors 26 and the plurality of second linear conductors 28 when viewed in the vertical direction.

The ground conductor 25a is provided on the laminate 12 as shown in FIG. More specifically, the ground conductor 25a is provided near the left end of the upper main surface of the insulator layer 14e. Therefore, the ground conductor 25a is located in the non-intersecting section A21. The ground conductor 25a has a rectangular shape when viewed in the vertical direction. The ground conductor 25 a is positioned below the signal conductor 20 . The ground conductor 25a overlaps the signal conductor 20 in the non-intersecting section A21 when viewed in the vertical direction. However, the ground conductor 25a does not overlap the plurality of first linear conductors 26 and the plurality of second linear conductors 28 when viewed in the vertical direction.

The ground conductor 25b is provided on the laminate 12 as shown in FIG. More specifically, the ground conductor 25b is provided near the right end of the upper main surface of the insulator layer 14e. Therefore, the ground conductor 25b is located in the non-intersecting section A23. The ground conductor 25b has a rectangular shape when viewed in the vertical direction. The ground conductor 25b is positioned below the signal conductor 20 . The ground conductor 25b overlaps the signal conductor 20 in the non-intersecting section A23 when viewed in the vertical direction. However, the ground conductor 25b does not overlap the plurality of first linear conductors 26 and the plurality of second linear conductors 28 when viewed in the vertical direction. The signal conductor 20 and the ground conductors 24a and 25a as described above have a stripline structure. Moreover, the signal conductor 20 and the ground conductors 24b and 25b have a stripline structure.

The first ground conductors 22a and 22b are provided on the laminate 12 as shown in FIG. More specifically, the first ground conductors 22a and 22b are provided at the same position as the signal conductor 20 in the vertical direction. In this embodiment, the first ground conductors 22a and 22b are located on the upper main surface of the insulator layer 14c. Therefore, the first ground conductors 22a and 22b do not overlap the signal conductor 20 when viewed in the vertical direction. The first ground conductors 22a, 22b have a linear shape. The first ground conductors 22a, 22b extend in the left-right direction. Therefore, the first ground conductors 22a and 22b extend along the signal conductor 20 when viewed in the vertical direction. In this embodiment, the first ground conductors 22a and 22b are parallel to the signal conductor 20 when viewed in the vertical direction. The first ground conductor 22 a is positioned in front of the signal conductor 20 . A first ground conductor 22b is positioned after the signal conductor 20 .

Since the first ground conductors 22a, 22b and the ground conductors 24a, 24b, 25a, 25b have the structures described above, the signal conductor 20 is arranged in the intersecting section A22 such that the first ground conductors 22a, 22b, the ground conductors 24a, 24b, 25a, 25b (one or more ground conductors) do not overlap. That is, the signal conductor 20 does not overlap any of the ground conductors provided in the multilayer substrate 10 in the intersection section A22.

In addition, each of the plurality of first linear conductors 26 overlaps the first ground conductors 22a and 22b (a part of the one or more ground conductors) when viewed in the vertical direction. More specifically, each of the front portions of the plurality of first linear conductors 26 overlaps the first ground conductor 22a when viewed in the vertical direction. Each rear portion of the plurality of first linear conductors 26 overlaps the first ground conductor 22b when viewed in the vertical direction.

Each of the plurality of second linear conductors 28 overlaps the first ground conductors 22a and 22b (partial ground conductors among one or more ground conductors) when viewed in the vertical direction. More specifically, each of the front portions of the plurality of second linear conductors 28 overlaps the first ground conductor 22a when viewed in the vertical direction. Each rear portion of the plurality of second linear conductors 28 overlaps the first ground conductor 22b when viewed in the vertical direction.

As described above, the first ground conductors 22a and 22b are positioned between the plurality of first linear conductors 26 and the plurality of second linear conductors 28 in the vertical direction. When viewed in the vertical direction, the first ground conductors 22a, 22b and the plurality of first linear conductors 26 among the first ground conductors 22a, 22b and the ground conductors 24a, 24b, 25a, 25b (one or more ground conductors) and/or a ground conductor that overlaps the plurality of second linear conductors 28 .

The interlayer connection conductor v3 penetrates the insulator layers 14a to 14d in the vertical direction. The interlayer connection conductor v3 electrically connects the external electrode 32a, the left end of the first ground conductor 22a, and the ground conductors 24a and 25a. The interlayer connection conductor v4 penetrates the insulator layers 14a to 14d in the vertical direction. The interlayer connection conductor v4 electrically connects the external electrode 34a, the left end of the first ground conductor 22b, and the ground conductors 24a and 25a.

The interlayer connection conductor v5 penetrates the insulator layers 14a to 14d in the vertical direction. The interlayer connection conductor v5 electrically connects the external electrode 32b, the right end portion of the first ground conductor 22a, and the ground conductors 24b and 25b. The interlayer connection conductor v6 penetrates the insulator layers 14a to 14d in the vertical direction. The interlayer connection conductor v6 electrically connects the external electrode 34b, the right end of the first ground conductor 22b, and the ground conductors 24a and 25a.

The protective layer 16 is an insulator layer provided on the upper main surface of the insulator layer 14a. The protective layer 16 covers substantially the entire surface of the insulator layer 14a and substantially the entire surfaces of the ground conductors 24a and 24b. However, openings ha to hf are provided in protective layer 16 . Each of the external electrodes 30a, 32a, 34a, 30b, 32b, 34b is exposed to the outside of the multilayer substrate 10 through openings ha to hf. The protective layer 16 is a resist applied to the upper main surface of the insulator layer 14a. However, the protective layer 16 may be a coverlay applied over the insulator layer 14a.

A signal conductor 20, first ground conductors 22a, 22b, ground conductors 24a, 24b, 25a, 25b, a plurality of first linear conductors 26, a plurality of second linear conductors 28, and external electrodes 30a, 30b, 32a, 32b, 34a and 34b are conductor layers formed by patterning a metal foil attached to the main surface of the insulator layer. The metal foil is, for example, copper foil. The interlayer connection conductors v1 to v6 are formed by filling conductive paste into through-holes penetrating the insulator layers and solidifying the conductive paste by heating.

By the way, as shown in FIG. 3, the multilayer substrate 10 can be used by being bent. Bending the multilayer substrate 10 means deforming the multilayer substrate 10 by applying an external force to the multilayer substrate 10 . The deformation may be elastic deformation, plastic deformation, or both elastic deformation and plastic deformation.

The multilayer substrate 10 has a first section A11, a second section A12, and a third section A13, as shown in FIG. The first section A11 and the third section A13 are sections in which the multilayer substrate 10 is not bent. The second section A12 is a section where the multilayer substrate 10 is bent. Therefore, the second section A12 is bent in the Z-axis direction with respect to the first section A11 so that the radius of curvature of the second section A12 is smaller than the radius of curvature of the first section A11 and the radius of curvature of the third section A13. . The Z-axis direction is the vertical direction in the first section A11. The positive direction of the Z-axis is the upward direction in the first section A11. The negative direction of the Z-axis is the downward direction in the first section A11. In this embodiment, the second section A12 is bent in the positive direction of the Z-axis with respect to the first section A11. The intersection section A22 is located in the second section A12. The intersection section A22 does not protrude from the second section A12. In this embodiment, the intersection section A22 coincides with the second section A12.

[effect]
(a) According to the multilayer substrate 10, fluctuations in characteristic impedance occurring in the signal conductor 20 can be suppressed. More specifically, the plurality of first linear conductors 26 and the plurality of second linear conductors 28 cross the signal conductors 20 when viewed vertically, and extend along each other when viewed vertically. there is Each of the plurality of first linear conductors 26 overlaps the first ground conductors 22a and 22b when viewed in the vertical direction. Moreover, each of the plurality of second linear conductors 28 overlaps the first ground conductors 22a and 22b when viewed in the vertical direction. Thereby, the signal conductor 20 is coupled to the ground conductor via the plurality of first linear conductors 26 and the plurality of second linear conductors 28 . That is, the characteristic impedance generated in the section of the signal conductor 20 overlapping with the plurality of first linear conductors 26 and the characteristic impedance generated in the section of the signal conductor 20 overlapping with the plurality of second linear conductors 28 are , approaches a given characteristic impedance (eg, 50Ω).

Here, if the section of the signal conductor 20 overlapping the plurality of first linear conductors 26 and the section overlapping the plurality of second linear conductors 28 of the signal conductor 20 are far apart in the horizontal direction. , the section in which the signal conductor 20 is not coupled to the ground conductor increases. The characteristic impedance of the section where the signal conductor 20 is not coupled with the ground conductor tends to be higher than the characteristic impedance of the section where the signal conductor 20 is coupled with the ground conductor. As a result, the characteristic impedance generated in the signal conductor 20 tends to fluctuate.

Therefore, in the multilayer substrate 10, when viewed in the vertical direction, each of the plurality of first regions A1 located between the two adjacent first linear conductors 26 has one of the plurality of second linear conductors 28. At least a portion of any one second linear conductor 28 overlaps. Further, when viewed in the vertical direction, any one of the plurality of first linear conductors 26 is placed in each of the plurality of second regions A2 positioned between the two adjacent second linear conductors 28. At least a portion of the first linear conductor 26 overlaps. This reduces the sections in which the signal conductor 20 is not coupled to the ground conductor. As a result, according to the multilayer substrate 10, fluctuations in the characteristic impedance occurring in the signal conductor 20 can be suppressed.

(b) According to the multilayer substrate 10, the multilayer substrate 10 can be easily bent. A comparative example is a multilayer substrate in which two ground conductors exist above and below the signal conductor so as to overlap substantially the entire signal conductor. In such a multi-layer board, when the multi-layer board is bent, the ground conductor located on the outer peripheral side of the signal conductor expands greatly, and the ground conductor located on the inner peripheral side of the signal conductor contracts greatly. Therefore, the two ground conductors prevent the multilayer substrate from being bent.

Here, in the multilayer substrate 10, when the second section A12 is bent in the Z-axis direction with respect to the first section A11, the plurality of second linear conductors 28 located inside the signal conductor 20 are contracted. , elongation occurs in the plurality of first linear conductors 26 located on the outer peripheral side of the signal conductor 20 . However, when viewed downward, any one of the plurality of second linear conductors 28 is placed in each of the plurality of first regions A1 positioned between the two adjacent first linear conductors 26. At least a portion of the second linear conductor 28 overlaps. Further, when viewed in the vertical direction, any one of the plurality of first linear conductors 26 is placed in each of the plurality of second regions A2 positioned between the two adjacent second linear conductors 28. At least a portion of the first linear conductor 26 overlaps. Thus, the plurality of first linear conductors 26 are not continuous on the signal conductor 20 . Similarly, the plurality of second linear conductors 28 are not continuous under the signal conductors 20 . This makes it difficult for the plurality of first linear conductors 26 and the plurality of second linear conductors 28 to prevent the multilayer substrate 10 from being bent. As described above, according to the multilayer substrate 10, the multilayer substrate 10 can be easily bent.

(c) According to the multilayer substrate 10, the multilayer substrate 10 can be easily bent for the following reasons. More specifically, if a hard substance such as a conductor is provided at a position spaced from the signal conductor 20 toward the inner or outer circumference, the bending of the multilayer substrate 10 is hindered by the hard substance. Therefore, in the multilayer substrate 10, the first ground conductors 22a and 22b are positioned between the plurality of first linear conductors 26 and the plurality of second linear conductors 28 in the vertical direction. As a result, the first ground conductors 22a and 22b are no longer provided at positions spaced from the signal conductor 20 toward the inner or outer circumference. As a result, the multilayer substrate 10 can be easily bent. In particular, the first ground conductors 22a and 22b are provided at the same position as the signal conductor 20 in the vertical direction. Therefore, the multilayer substrate 10 can be folded more easily.

(d) According to the multilayer substrate 10, the multilayer substrate 10 can be easily bent for the following reasons. More specifically, the multiple first linear conductors 26 do not overlap the multiple second linear conductors 28 when viewed in the vertical direction. As a result, a section in which the first linear conductor 26 and the second linear conductor 28 are arranged in the vertical direction does not occur in the multilayer substrate 10 . Therefore, in the multilayer substrate 10, a section in which the multilayer substrate 10 is difficult to bend is less likely to occur. As a result, the multilayer substrate 10 can be easily bent.

(e) According to the multilayer substrate 10, the vertical thickness of the multilayer substrate 10 is reduced. More specifically, when the first ground conductors 22a and 22b are positioned above or below the plurality of first linear conductors 26, the first ground conductors 22a and 22b are positioned above or below the plurality of first linear conductors 26. An insulator layer is required to provide the In this case, since the number of insulating layers of the multilayer substrate 10 is increased, the thickness of the multilayer substrate 10 in the vertical direction is increased. Therefore, in the multilayer substrate 10, the first ground conductors 22a and 22b are positioned between the plurality of first linear conductors 26 and the plurality of second linear conductors 28 in the vertical direction. This eliminates the need for an insulator layer for providing the first ground conductors 22 a and 22 b above or below the plurality of first linear conductors 26 . As described above, according to the multilayer substrate 10, the vertical thickness of the multilayer substrate 10 is reduced.

(f) According to the multilayer substrate 10, it is possible to suppress fluctuations in the characteristic impedance occurring in the signal conductor 20 for the following reasons. More specifically, ground conductors 24a, 25a, 24b, and 25b are provided in the non-intersecting sections A21 and A23, respectively. A plurality of first linear conductors 26 and a plurality of second linear conductors 28 are provided in the intersection section A22. A first region A<b>1 exists between the plurality of first linear conductors 26 . A second region A<b>2 exists between the plurality of second linear conductors 28 . Therefore, the capacitance generated in the signal conductor 20 per unit length in the non-crossing sections A21 and A23 tends to be larger than the capacitance generated in the signal conductor 20 per unit length in the crossing section A22. Therefore, as shown in FIG. 1, the line width w2 of the signal conductor 20 in the crossing section A22 is thicker than the line width w1 of the signal conductor 20 in the non-crossing section A21 and the line width w3 of the signal conductor 20 in the non-crossing section A23. As a result, the capacitance generated in the signal conductor 20 per unit length in the cross section A22 approaches the capacitance generated in the signal conductor 20 per unit length in the non-cross sections A21 and A23. As a result, according to the multilayer substrate 10, fluctuations in the characteristic impedance occurring in the signal conductor 20 can be suppressed.

(First modification)
A multilayer substrate 10a according to a first modified example will be described below with reference to the drawings. FIG. 4 is a cross-sectional view of the multilayer substrate 10a.

The multilayer board 10a differs from the multilayer board 10 in that each of the plurality of first linear conductors 26 overlaps with the plurality of second linear conductors 28 when viewed in the vertical direction. More specifically, the left portions of the plurality of first linear conductors 26 each overlap the right portions of the plurality of second linear conductors 28 when viewed in the vertical direction. The rest of the structure of the multilayer substrate 10a is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10a has the effects (a) to (c), (e) and (f).

(Second modification)
A multilayer substrate 10b according to a second modified example will be described below with reference to the drawings. FIG. 5 is a cross-sectional view of the multilayer substrate 10b.

The multilayer substrate 10b differs from the multilayer substrate 10 in that the line width W1 of the plurality of first linear conductors 26 is thinner than the line width W2 of the plurality of second linear conductors 28 when viewed in the vertical direction. In such a multilayer substrate 10b, as shown in FIG. 3, the second section A12 is bent in the positive direction of the Z-axis with respect to the first section A11. The rest of the structure of the multilayer substrate 10b is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10b has the effects (a) to (f).

According to the multilayer substrate 10b, when the second section A12 is bent in the positive direction of the Z-axis with respect to the first section A11, fluctuations in the characteristic impedance generated in the signal conductor 20 in the second section A12 are suppressed. be. More specifically, in the multilayer substrate 10b, the line width W1 of the plurality of first linear conductors 26 is narrower than the line width W2 of the plurality of second linear conductors . Therefore, the lateral width of the first area A1 is greater than the lateral width of the second area A2. When the second section A12 bends in the positive direction of the Z-axis with respect to the first section A11, the plurality of first linear conductors 26 are located inside the plurality of second linear conductors 28. As shown in FIG. At this time, the width of the first area A1 in the left-right direction is reduced. On the other hand, the lateral width of the second area A2 increases. Therefore, the width in the horizontal direction of the first area A1 approaches the width in the horizontal direction of the second area A2. A characteristic impedance generated in a section (first region A1) of the signal conductor 20 that does not overlap the plurality of first linear conductors 26 and a section (second region A1) that does not overlap the plurality of second linear conductors 28 in the signal conductor 20 The difference from the characteristic impedance generated in the region A2) becomes small. As a result, fluctuations in the characteristic impedance occurring in the signal conductor 20 can be suppressed.

(Third modification)
A multilayer substrate 10c according to a third modified example will be described below with reference to the drawings. FIG. 6 is a cross-sectional view of the multilayer substrate 10c.

The multilayer board 10c differs from the multilayer board 10 in that each of the plurality of first linear conductors 26 overlaps the two second linear conductors 28 located on the left and right when viewed in the vertical direction. More specifically, the left portions of the plurality of first linear conductors 26 each overlap the right portions of the plurality of second linear conductors 28 when viewed in the vertical direction. Each of the right portions of the plurality of first linear conductors 26 overlaps the left portions of the plurality of second linear conductors 28 when viewed in the vertical direction. Thereby, each of the plurality of first regions A1 overlaps the plurality of second linear conductors 28 when viewed in the vertical direction. Each of the plurality of second regions A2 overlaps the plurality of first linear conductors 26 when viewed in the vertical direction. The rest of the structure of the multilayer substrate 10c is the same as that of the multilayer substrate 10, so description thereof will be omitted. The multilayer substrate 10c has the effects (a) to (c), (e) and (f).

Further, according to the multilayer substrate 10c, the characteristic impedance generated in the signal conductor 20 is suppressed from fluctuating due to lamination displacement of the insulator layers 14a to 14e. More specifically, each of the plurality of first linear conductors 26 overlaps two second linear conductors 28 located on the left and right. As a result, even if the insulating layers 14a to 14e are not stacked, the plurality of first regions A1 as a whole overlaps with the plurality of second linear conductors 28 when viewed in the vertical direction. Each of the plurality of second regions A2 as a whole overlaps with the plurality of first linear conductors 26 when viewed in the vertical direction. As a result, fluctuations in the characteristic impedance generated in the signal conductor 20 in the first region A1 are suppressed. Similarly, fluctuations in the characteristic impedance generated in the signal conductor 20 in the second area A2 are suppressed. According to the multilayer substrate 10c, the characteristic impedance generated in the signal conductor 20 is suppressed from fluctuating due to lamination displacement of the insulator layers 14a to 14e.

(Fourth modification)
A multilayer substrate 10d according to a fourth modification will be described below with reference to the drawings. FIG. 7 is a cross-sectional view of the multilayer substrate 10d.

In the multilayer substrate 10d, the vertical thickness D12 of the laminate 12 in the intersecting section A22 is obtained from the vertical thickness D11 of the laminate 12 in the non-intersecting section A21 and the vertical thickness D13 of the laminate 12 in the non-intersecting section A23. It differs from the multilayer substrate 10 in a small point. In the non-intersecting sections A21 and A23, the insulator layer 14f is laminated on the insulator layer 14a. On the other hand, in the intersection section A22, the insulator layer 14f is not stacked on the insulator layer 14a. The rest of the structure of the multilayer substrate 10d is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10d has the effects (a) to (f).

According to the multilayer substrate 10d, it becomes easy to use the non-intersection sections A21 and A23 as rigid areas and the intersection section A22 as a non-rigid area. Rigid regions are less likely to bend in the Z-axis direction than non-rigid regions.

(Fifth modification)
A multilayer substrate 10e according to a fifth modification will be described below with reference to the drawings. FIG. 8 is a cross-sectional view of the multilayer substrate 10e.

The multilayer substrate 10 e differs from the multilayer substrate 10 in that it further includes a plurality of fifth linear conductors 60 and a plurality of sixth linear conductors 62 . The plurality of fifth linear conductors 60 and the plurality of sixth linear conductors 62 cross the signal conductor 20 and the first ground conductors 22a and 22b when viewed in the vertical direction. The plurality of fifth linear conductors 60 are positioned above the plurality of first linear conductors 26 . Each of the plurality of fifth linear conductors 60 overlaps with one of the plurality of first regions A1. The line width W5 of the plurality of fifth linear conductors 60 is the same as the width in the horizontal direction of the plurality of first regions A1. The multiple sixth linear conductors 62 are positioned below the multiple second linear conductors 28 . Each of the plurality of sixth linear conductors 62 overlaps with one of the plurality of second regions A2. The line width W6 of the plurality of sixth linear conductors 62 is the same as the width in the horizontal direction of the plurality of second regions A2. The plurality of fifth linear conductors 60 and the plurality of sixth linear conductors 62 as described above are not DC-coupled to any of the external electrodes. The rest of the structure of the multilayer substrate 10e is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10e has the effects (a) to (c), (e) and (f).

According to the multilayer substrate 10e, the line width W5 of the plurality of fifth linear conductors 60 is the same as the width in the horizontal direction of the plurality of first regions A1. Therefore, the first linear conductor 26 or the fifth linear conductor 60 exists above the signal conductor 20 in the intersection section A22. Therefore, in the intersection section A22, the entire signal conductor 20 is covered with the first linear conductor 26 and the fifth linear conductor 60 when viewed downward. Similarly, the line width W6 of the plurality of sixth linear conductors 62 is the same as the width in the horizontal direction of the plurality of second regions A2. Therefore, the second linear conductor 28 or the sixth linear conductor 62 exists under the signal conductor 20 in the cross section A22. Therefore, in the intersection section A22, the entire signal conductor 20 is covered with the second linear conductor 28 and the sixth linear conductor 62 when viewed upward. As a result, fluctuations in the characteristic impedance generated in the signal conductor 20 are suppressed, and the shielding performance of the signal conductor 20 is improved.

(Sixth modification)
A multilayer substrate 10f according to a sixth modification will be described below with reference to the drawings. FIG. 9 is a cross-sectional view of the multilayer substrate 10f.

In the multilayer substrate 10f, the line width W5 of the plurality of fifth linear conductors 60 is narrower than the width of the plurality of first regions A1 in the horizontal direction, and the line width W6 of the plurality of sixth linear conductors 62 is greater than the width of the plurality of first regions A1. It differs from the multilayer substrate 10e in that it is narrower than the width of the two regions A2 in the horizontal direction. In this way, in the intersection section A22, there may be a section where the signal conductor 20 is not covered with the first linear conductor 26 and the fifth linear conductor 60 when viewed downward. In the intersection section A22, there may be a section where the signal conductor 20 is not covered with the second linear conductor 28 and the sixth linear conductor 62 when viewed upward. The rest of the structure of the multilayer substrate 10f is the same as that of the multilayer substrate 10e, so the description is omitted. The multilayer substrate 10f has the effects of (a) to (c), (e) and (f).

(Seventh modification)
A multilayer substrate 10g according to a seventh modification will be described below with reference to the drawings. FIG. 10 is an exploded perspective view of the multilayer substrate 10g.

The multilayer substrate 10g differs from the multilayer substrate 10 in that the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are not perpendicular to the signal conductors 20 when viewed in the vertical direction. The plurality of first linear conductors 26 and the plurality of second linear conductors 28 of the multilayer substrate 10g rotate counterclockwise with respect to the plurality of first linear conductors 26 and the plurality of second linear conductors 28 of the multilayer substrate 10. It has a structure rotated by 45°. The rest of the structure of the multilayer substrate 10g is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10g has the effects (a) to (f).

(Eighth modification)
A multilayer substrate 10h according to the eighth example will be described below with reference to the drawings. FIG. 11 is an exploded perspective view of the multilayer substrate 10h.

The multilayer substrate 10h differs from the multilayer substrate 10g in that it further includes a plurality of third linear conductors 50 and a plurality of fourth linear conductors 52. The plurality of first linear conductors 26 and the plurality of third linear conductors 50 form a mesh structure. The plurality of second linear conductors 28 and the plurality of fourth linear conductors 52 form a mesh structure.

More specifically, the multiple third linear conductors 50 are provided on the laminate 12 . In this embodiment, the plurality of third linear conductors 50 are located on the upper main surface of the insulator layer 14b. Thereby, the plurality of third linear conductors 50 are positioned above the signal conductors 20 . The plurality of third linear conductors 50 are arranged in the direction in which the signal conductors 20 extend. The plurality of third linear conductors 50 intersect the signal conductors 20 when viewed in the vertical direction.

Such a plurality of third linear conductors 50 extend along each other when viewed in the vertical direction. In this embodiment, the plurality of third linear conductors 50 are parallel to each other when viewed in the vertical direction. However, the plurality of third linear conductors 50 are not parallel to the plurality of first linear conductors 26 when viewed in the vertical direction. The multiple third linear conductors 50 are orthogonal to the multiple first linear conductors 26 . However, the plurality of third linear conductors 50 need not be orthogonal to the plurality of first linear conductors 26 .

A plurality of fourth linear conductors 52 are provided on the laminate 12 . In this embodiment, the plurality of fourth linear conductors 52 are located on the upper main surface of the insulator layer 14d. Thereby, the plurality of fourth linear conductors 52 are positioned below the signal conductors 20 . The plurality of fourth linear conductors 52 are arranged in the direction in which the signal conductors 20 extend. The plurality of fourth linear conductors 52 intersect the signal conductors 20 when viewed in the vertical direction.

Such a plurality of fourth linear conductors 52 extend along each other when viewed in the vertical direction. In this embodiment, the plurality of fourth linear conductors 52 are parallel to each other when viewed in the vertical direction. However, the multiple fourth linear conductors 52 are not parallel to the multiple second linear conductors 28 when viewed in the vertical direction. The multiple fourth linear conductors 52 are orthogonal to the multiple second linear conductors 28 .

The plurality of third linear conductors 50 and the plurality of fourth linear conductors 52 as described above are arranged alternately in the direction in which the signal conductors 20 extend when viewed in the vertical direction. The rest of the structure of the multilayer substrate 10h is the same as that of the multilayer substrate 10g, so the description is omitted. The multilayer substrate 10h has the effects (a) to (c), (e) and (f).

(Ninth modification)
A multilayer substrate 10i according to the ninth example will be described below with reference to the drawings. FIG. 12 is an exploded perspective view of the multilayer substrate 10i.

The multi-layer board 10i differs from the multi-layer board 10h in that the first ground conductors 22a and 22b are not provided and the ground conductors 27a-27d and 29a-29d are provided. The plurality of first linear conductors 26 and the plurality of third linear conductors 50 are located on the upper major surface of the insulator layer 14a. The plurality of second linear conductors 28 and the plurality of fourth linear conductors 52 are located on the upper major surface of the insulator layer 14e.

The ground conductors 27a to 27d are located on the upper main surface of the insulator layer 14b. The ground conductor 27a has the same shape as the ground conductor 25a. The ground conductor 27b has the same shape as the ground conductor 25b. The ground conductor 27c extends in the left-right direction. The ground conductor 27c connects the front end of the right side of the ground conductor 27a and the front end of the left side of the ground conductor 27b. The ground conductor 27d extends in the left-right direction. The ground conductor 27d connects the rear end portion of the right side of the ground conductor 27a and the rear end portion of the left side of the ground conductor 27b. The ground conductors 27c and 27d overlap the plurality of first linear conductors 26, the plurality of second linear conductors 28, the plurality of third linear conductors 50, and the plurality of fourth linear conductors 52 when viewed in the vertical direction. ing.

The ground conductors 29a to 29d are located on the upper main surface of the insulator layer 14d. The ground conductor 29a has the same shape as the ground conductor 25a. The ground conductor 29b has the same shape as the ground conductor 25b. The ground conductor 29c extends in the left-right direction. The ground conductor 29c connects the front end of the right side of the ground conductor 29a and the front end of the left side of the ground conductor 29b. The ground conductor 29d extends in the left-right direction. The ground conductor 29d connects the rear end portion of the right side of the ground conductor 29a and the rear end portion of the left side of the ground conductor 29b. The ground conductors 29c and 29d overlap the plurality of first linear conductors 26, the plurality of second linear conductors 28, the plurality of third linear conductors 50, and the plurality of fourth linear conductors 52 when viewed in the vertical direction. ing.

Even if the multilayer substrate 10i does not include the first ground conductors 22a and 22b, the signal conductors 20 are composed of a plurality of first linear conductors 26, a plurality of second linear conductors 28, a plurality of third linear conductors 50 and Capacitive coupling with the ground conductors 27a to 27d and 29a to 29d can be achieved via the plurality of fourth linear conductors 52. FIG. The rest of the structure of the multilayer substrate 10i is the same as that of the multilayer substrate 10h, so the description is omitted. The multilayer substrate 10i has the effects (a) to (c), (e) and (f).

(Tenth Modification)
The multilayer substrate 10j according to the tenth example will be described below with reference to the drawings. FIG. 13 is an exploded perspective view of the multilayer substrate 10j.

The multilayer board 10j differs from the multilayer board 10 in that the plurality of first linear conductors 26 and the plurality of second linear conductors 28 are connected to the ground potential. More specifically, the multilayer substrate 10j further includes connection conductors 70a, 70b, 72a, 72b. The connection conductors 70a and 70b are provided on the upper main surface of the insulator layer 14b. The connection conductors 70a and 70b extend in the left-right direction. Front ends of the plurality of first linear conductors 26 are connected to the connection conductor 70a. The rear ends of the plurality of first linear conductors 26 are connected to the connection conductor 70b. The left end of the connection conductor 70a is connected to the interlayer connection conductor v3. The right end of the connection conductor 70a is connected to the interlayer connection conductor v5. The left end of the connection conductor 70b is connected to the interlayer connection conductor v4. The right end of the connection conductor 70b is connected to the interlayer connection conductor v6. Thereby, the plurality of first linear conductors 26 and the connection conductors 70a and 70b are connected to the ground potential.

The connection conductors 72a and 72b are provided on the upper main surface of the insulator layer 14d. The connection conductors 72a and 72b extend in the left-right direction. Front ends of the plurality of second linear conductors 28 are connected to the connection conductor 72a. The rear ends of the plurality of second linear conductors 28 are connected to the connection conductor 72b. The left end of the connection conductor 72a is connected to the interlayer connection conductor v3. The right end of the connection conductor 72a is connected to the interlayer connection conductor v5. The left end of the connection conductor 72b is connected to the interlayer connection conductor v4. The right end of the connection conductor 72b is connected to the interlayer connection conductor v6. Thereby, the plurality of second linear conductors 28 and the connection conductors 72a and 72b are connected to the ground potential. Other structures of the multilayer substrate 10j are the same as those of the multilayer substrate 10, so description thereof is omitted. The multilayer substrate 10j has the effects (a) to (f).

(11th modification)
The multilayer substrate 10k according to the eleventh example will be described below with reference to the drawings. FIG. 14 is an exploded perspective view of the multilayer substrate 10k.

In the multilayer substrate 10k, the plurality of first linear conductors 26, the plurality of second linear conductors 28, the plurality of third linear conductors 50, and the plurality of fourth linear conductors 52 are connected to the ground potential. is different from the multilayer substrate 10i. More specifically, multilayer substrate 10k does not include 14a and 14e. The ground conductors 24a, 24b are located on the upper main surface of the insulator layer 14b. The multiple first linear conductors 26 and the multiple third linear conductors 50 are connected to the ground conductors 24a and 24b. The ground conductors 25a, 25b are located on the upper main surface of the insulator layer 14d. The plurality of second linear conductors 28 and the plurality of fourth linear conductors 52 are connected to ground conductors 25a and 25b. Thereby, the plurality of first linear conductors 26, the plurality of second linear conductors 28, the plurality of third linear conductors 50, and the plurality of fourth linear conductors 52 are connected to the ground potential. The rest of the structure of the multilayer substrate 10k is the same as that of the multilayer substrate 10i, so the description is omitted. The multilayer substrate 10k has the effects (a) to (c), (e) and (f).

(Twelfth modification)
A multilayer substrate 10l according to the twelfth example will be described below with reference to the drawings. FIG. 15 is an exploded perspective view of the multilayer substrate 10l.

The multilayer substrate 10l differs from the multilayer substrate 10 in that the insulator layers 14a and 14e do not exist. The ground conductors 24a, 24b are located on the upper main surface of the insulator layer 14b. The ground conductors 25a, 25b are located on the upper main surface of the insulator layer 14d. The rest of the structure of the multilayer substrate 10l is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10l has the effects (a) to (f).

Also, according to the multilayer substrate 10l, since the insulator layers 14a and 14e do not exist, the thickness of the multilayer substrate 10l in the vertical direction is further reduced.

(13th modification)
The multilayer substrate 10m according to the thirteenth example will be described below with reference to the drawings. FIG. 16 is an exploded perspective view of the multilayer substrate 10m.

The multilayer substrate 10m differs from the multilayer substrate 10 in that the line width of the signal conductors 22 is uniform. More specifically, the line width w2 of the signal conductor 20 in the cross section A22 is equal to the line width w1 of the signal conductor 20 in the non-cross section A21 and the line width w3 of the signal conductor 20 in the non-cross section A23. The rest of the structure of the multilayer substrate 10m is the same as that of the multilayer substrate 10, so the description is omitted. The multilayer substrate 10m has the effects (a) to (f).

(Other embodiments)
The multilayer substrate according to the present invention is not limited to the multilayer substrates 10, 10a to 10m, and can be modified within the scope of the gist thereof. Also, the structures of the multilayer substrates 10, 10a to 10m may be combined arbitrarily.

The multilayer substrates 10, 10a to 10i, 10l, and 10m are equipped with a plurality of ground conductors. However, the multilayer substrates 10, 10a-10i, 10l, 10m only need to have one or more ground conductors.

Note that the laminate 12 of the multilayer substrates 10, 10a to 10m does not have to be flexible.

The material of the insulator layers 14a to 14f may be resin other than thermoplastic resin. Also, the material of the insulator layers 14a to 14f may be an insulating material other than resin. Examples of insulating materials other than resin include ceramics.

It should be noted that the number of the plurality of first linear conductors 26 should be two or more. The number of the plurality of second linear conductors 28 should be two or more. The number of the plurality of third linear conductors 50 should be two or more. The number of fourth linear conductors 52 may be two or more.

The multilayer substrates 10, 10a-10m are provided with a plurality of external electrodes. However, the multilayer substrates 10, 10a-10m only need to have one or more external electrodes.

In the multilayer substrates 10, 10a to 10m, the second section A12 is bent in the Z-axis direction with respect to the first section A11 so that the radius of curvature of the second section A12 is smaller than the radius of curvature of the first section A11. All you have to do is Therefore, the second section A12 may be bent in the Z-axis direction.

Note that the first ground conductors 22a and 22b do not have to be positioned between the plurality of first linear conductors 26 and the plurality of second linear conductors 28 in the vertical direction.

Note that the plurality of first linear conductors 26 do not have to be provided at the same position in the vertical direction. Therefore, the plurality of first linear conductors 26 may be dispersedly positioned on the main surfaces of the plurality of insulator layers.

Note that the plurality of second linear conductors 28 do not have to be provided at the same position in the vertical direction. Therefore, the plurality of second linear conductors 28 may be dispersedly positioned on the main surfaces of the plurality of insulator layers.

It should be noted that the second section A12 does not have to match the intersection section A22. For example, the second section A12 may include portions of the non-crossing sections A21 and A23 in addition to the crossing section A22.

The line width of the signal conductors 22 of the multilayer substrates 10a to 10l may be uniform, like the line width of the signal conductors 22 of the multilayer substrate 10m.

10, 10a to 10m: multilayer substrate 12: laminates 14a to 14f: insulator layer 16: protective layer 20: signal conductors 22a, 22b: first ground conductors 24a, 24b, 25a, 25b: ground conductors 26: first line Conductor 28: Second linear conductors 30a, 30b, 32a, 32b, 34a, 34b: External electrode 50: Third linear conductor 52: Fourth linear conductor 60: Fifth linear conductor 62: Sixth linear Conductors 70a, 70b, 72a, 72b: Connection conductor A1: First area A11: First section A12: Second section A13: Third section A2: Second area A21, A23: Non-intersecting section A22: Intersecting section C1, C2 , C11, C12: center v1 to v6: interlayer connection conductor

Claims (17)

1. A multilayer substrate,
   a laminate having a structure in which a plurality of insulator layers are stacked vertically;
   a signal conductor provided in the laminate and having a linear shape;
   a plurality of first linear conductors provided in the laminate, positioned above the signal conductor, and crossing the signal conductor when viewed in the vertical direction;
   a plurality of second linear conductors provided in the laminate, positioned below the signal conductor, and crossing the signal conductor when viewed in the vertical direction;
   and
   The plurality of second linear conductors extend along the plurality of first linear conductors when viewed in the vertical direction,
   Any one of the plurality of second linear conductors is provided in each of the plurality of first regions positioned between the two adjacent first linear conductors when viewed in the vertical direction. at least a portion of the conductors overlap, and
   Any one of the plurality of first linear conductors is provided in each of the plurality of second regions positioned between the two adjacent second linear conductors when viewed in the vertical direction. at least a portion of the conductors overlap, and
   having the structure of (A) or (B),
   multilayer board.
   (A)
   The multilayer substrate is
   one or more external electrodes provided on the laminate and electrically connected to an external circuit;
   one or more ground conductors;
   It is also equipped with
   The plurality of first linear conductors and the plurality of second linear conductors are not DC-coupled to any of the one or more external electrodes,
   A section in which the signal conductor crosses the plurality of first linear conductors or the plurality of second linear conductors is defined as an intersection section,
   the signal conductor does not overlap the one or more ground conductors in the cross section;
   each of the plurality of first linear conductors overlaps a part of the one or more ground conductors when viewed in the vertical direction;
   Each of the plurality of second linear conductors overlaps a part of the one or more ground conductors when viewed in the vertical direction.
   (B)
   The plurality of first linear conductors and the plurality of second linear conductors are connected to a ground potential.
2. The multilayer substrate has a first section and a second section,
   The second section is bent in the vertical direction of the first section with respect to the first section such that the radius of curvature of the second section is smaller than the radius of curvature of the first section,
   The intersection section is located in the second section,
   The multilayer substrate according to claim 1.
3. The second section is bent upward in the first section with respect to the first section,
   The line width of the plurality of first linear conductors is thinner than the line width of the plurality of second linear conductors,
   The multilayer substrate according to claim 2.
4. A section in which the signal conductor does not intersect the plurality of first linear conductors and the plurality of second linear conductors is defined as a non-intersecting section,
   The vertical thickness of the laminate in the intersecting section is smaller than the vertical thickness of the laminate in the non-intersecting section,
   4. The multilayer substrate according to any one of claims 1 to 3.
5. The plurality of first linear conductors are orthogonal to the signal conductors when viewed in the vertical direction.
   The multilayer substrate according to any one of claims 1 to 4.
6. The multilayer substrate is
   a plurality of third linear conductors provided in the laminate, positioned above the signal conductors, and aligned in a direction in which the signal conductors extend;
   It is also equipped with
   The plurality of third linear conductors extend along each other when viewed in the vertical direction, and are not parallel to the plurality of first linear conductors when viewed in the vertical direction. crosses the signal conductors;
   The multilayer substrate according to any one of claims 1 to 4.
7. The multilayer substrate is
   a plurality of fourth linear conductors provided in the laminate, positioned below the signal conductors, and aligned in the direction in which the signal conductors extend;
   It is also equipped with
   The plurality of fourth linear conductors extend along each other when viewed in the vertical direction, and are not parallel to the plurality of second linear conductors when viewed in the vertical direction. and intersect the signal conductors,
   The plurality of third linear conductors and the plurality of fourth linear conductors are arranged alternately in the direction in which the signal conductors extend when viewed in the vertical direction.
   The multilayer substrate according to claim 6.
8. When viewed in the vertical direction, the first ground conductor overlapping the plurality of first linear conductors and/or the plurality of second linear conductors among the one or more ground conductors positioned between the first linear conductor and the plurality of second linear conductors;
   A multilayer substrate according to any one of claims 1 to 7.
9. The first ground conductor is provided at the same position as the signal conductor in the vertical direction,
   The first ground conductor extends along the signal conductor when viewed in the vertical direction.
   The multilayer substrate according to claim 8.
10. The line width of the plurality of first linear conductors is half the period of the arrangement of the plurality of first linear conductors.
    10. The multilayer substrate according to any one of claims 1 to 9.
11. The multilayer substrate is
    A plurality of fifth linear conductors provided in the laminate, positioned above the plurality of first linear conductors, and crossing the signal conductors when viewed in the vertical direction. and,
    A plurality of sixth linear conductors provided in the laminate, positioned below the plurality of second linear conductors, and crossing the signal conductors when viewed in the vertical direction. and,
    each of the plurality of fifth linear conductors overlaps with one of the plurality of first regions,
    Each of the plurality of sixth linear conductors overlaps any one of the plurality of second regions,
    A multilayer substrate according to any one of claims 1 to 10.
12. The material of the plurality of insulator layers is resin,
    A multilayer substrate according to any one of claims 1 to 11.
13. The material of the plurality of insulator layers is a thermoplastic resin,
    The multilayer substrate according to claim 12.
14. Centers in the line width direction of the plurality of first linear conductors do not overlap centers in the line width direction of the plurality of second linear conductors,
    A multilayer substrate according to any one of claims 1 to 13.
15. Each of the centers in the line width direction of the plurality of first regions does not overlap the centers in the line width direction of the plurality of second regions,
    A multilayer substrate according to any one of claims 1 to 14.
16. The plurality of first linear conductors do not overlap the plurality of second linear conductors when viewed in the vertical direction,
    16. A multilayer substrate according to any one of claims 1 to 15.
17. The plurality of first linear conductors are provided at the same position in the vertical direction,
    17. A multilayer substrate according to any one of claims 1 to 16.

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