JP2016092561A - Transmission line and flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a transmission line and a flat cable which allow for suppression of unnecessary coupling between a plurality of transmission line parts, while including the plurality of transmission line parts in one multilayer insulator.SOLUTION: A transmission line includes a multilayer insulator laminating a plurality of insulator layers, and a conductor pattern arranged along the insulator layer inside of the multilayer insulator. The conductor pattern includes upper ground conductor patterns 21, 23, lower ground conductor patterns 22, 24, and a first signal conductor pattern 31 and a second signal conductor pattern 32 having a part running in parallel with each other. At a portion of the parallel running part, the upper ground conductor patterns 21, 23 and lower ground conductor patterns 22, 24 sandwich the first signal conductor pattern 31 and second signal conductor pattern 32 in the lamination direction of the insulator layer, and include a first vacancy H1 formed between the first signal conductor pattern 31 and second signal conductor pattern 32.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a transmission line and a flat cable for transmitting a plurality of high-frequency signals.

  Conventionally, various transmission lines for transmitting high-frequency signals have been devised. For example, Patent Document 1 discloses a transmission line having a stripline structure. The transmission line described in Patent Document 1 includes a long laminated insulator extending in the transmission direction of a high-frequency signal, a plurality of signal lines, and first and second ground conductors. The plurality of signal lines are alternately shifted up and down and arranged in parallel with the first and second ground conductors. With this configuration, the characteristic impedances of these lines are matched to a predetermined value, and a plurality of lines are arranged with high density.

JP-A-4-144301

  In the transmission line having the structure shown in Patent Document 1, it is difficult to match each signal line to a desired impedance. Further, since the ground layers overlapping in the stacking direction are shared, coupling via the ground layer is likely to occur. That is, signal leakage between transmission lines due to feedback current is likely to occur.

  On the other hand, by arranging an interlayer connection conductor between the signal lines, a structure that suppresses unnecessary coupling between adjacent signal lines by the interlayer connection conductor can be considered.

  However, in the configuration in which the interlayer connection conductor is disposed between adjacent signal lines, the following problem occurs.

(A) When the pitch of the interlayer connection conductors arranged between adjacent signal lines is made coarse or the interlayer connection conductors are eliminated, the signal lines are easily joined unnecessarily. On the other hand, if the pitch of the interlayer connection conductor is made fine, the capacitance between the signal line and the interlayer connection conductor increases, and it becomes difficult to realize a desired characteristic impedance as a transmission line.

(B) The smaller the width of the laminated insulator, the larger the capacitance generated between the interlayer connection conductor and the signal line, and it becomes difficult to realize a desired characteristic impedance as a transmission line.

  Then, the objective of this invention is providing the transmission line and flat cable which can suppress the unnecessary coupling | bonding between these several transmission line parts, providing a several laminated transmission line part in one laminated insulator.

(1) The transmission line of the present invention is
A laminated insulator in which a plurality of insulator layers are laminated;
A conductor pattern disposed along the insulator layer in the laminated insulator;
A transmission line comprising:
The conductor pattern includes an upper ground conductor pattern, a lower ground conductor pattern, a first signal conductor pattern and a second signal conductor pattern having portions parallel to each other,
The upper ground conductor pattern and the lower ground conductor pattern sandwich the first signal conductor pattern and the second signal conductor pattern in the stacking direction of the insulator layer in a part of the parallel portion,
A first hole (a hole between signal conductors) formed between the first signal conductor pattern and the second signal conductor pattern is provided.

  With the above configuration, the first transmission line is constituted by the upper ground conductor pattern, the lower ground conductor pattern, and the first signal conductor pattern, and the second transmission line is constituted by the upper ground conductor pattern, the lower ground conductor pattern, and the second signal conductor pattern. Composed. Then, by forming a hole between the first signal conductor pattern and the second signal conductor pattern, a portion having a low relative dielectric constant is interposed between the first signal conductor pattern and the second signal conductor pattern. It will be. This suppresses unnecessary coupling between the first signal conductor pattern and the second signal conductor pattern via the electromagnetic field. For this reason, even if the distance between the first signal conductor pattern and the second signal conductor pattern is relatively narrow, predetermined isolation can be ensured, so that the width of the entire transmission line can be reduced.

(2) In the above (1), it is preferable that a plurality of the first holes are arranged along the extending direction of the first signal conductor pattern and the second signal conductor pattern.

  With the above configuration, it becomes easier to bend while maintaining the mechanical strength as compared with the case where continuous holes are formed.

(3) In the transmission line according to the above (1) or (2), at least one of the upper ground conductor pattern and the lower ground conductor pattern is a first ground conductor pattern portion along the first signal conductor pattern. Separated into a second ground conductor pattern portion along the second signal conductor pattern;
It is preferable that a second hole (a hole between ground conductors) is formed between the first ground conductor pattern portion and the second ground conductor pattern portion.

  With the above configuration, the first ground conductor pattern portion and the second ground conductor pattern portion are separated, and a second hole is formed between the first ground conductor pattern portion and the second ground conductor pattern portion. Thus, the coupling via the ground conductor pattern (the first ground conductor pattern portion and the second ground conductor pattern portion) is suppressed.

(4) In the transmission line according to (3), it is preferable that a plurality of the second holes are arranged along the extending direction of the first signal conductor pattern and the second signal conductor pattern.

  With the above configuration, it becomes easier to bend while maintaining the mechanical strength as compared with the case where continuous holes are formed.

(5) In the transmission line according to (3) or (4), it is preferable that the first hole and the second hole are continuous.

  With the above configuration, unnecessary coupling via the electromagnetic field formed by the first signal conductor pattern and the electromagnetic field formed by the second signal conductor pattern is further suppressed.

(6) In the transmission line according to any one of (3) to (5), the first ground conductor pattern portion or the second ground conductor pattern portion is viewed in a laminating direction of the insulator layer (planar surface). And a protrusion protruding in a region between the first signal conductor pattern and the second signal conductor pattern and in which the second hole is not formed, and formed in the protrusion, It is preferable that an interlayer connection conductor for connecting the upper ground conductor pattern and the lower ground conductor pattern is provided.

  With the above configuration, the electric potential between the upper ground conductor pattern and the lower ground conductor pattern is stabilized, and the coupling between the first transmission line portion and the second transmission line portion via the upper ground conductor pattern and the lower ground conductor pattern is suppressed. The Further, the interlayer connection conductor is disposed without increasing the width of the entire transmission line. In addition, since the protruding portion is arranged not in the side portion of the transmission line but in the inside, unnecessary radiation from the protruding portion and the interlayer connection conductor formed in the protruding portion is suppressed.

(7) In the transmission line according to (6), the protrusion includes a first protrusion protruding from the first ground conductor pattern portion and a second protrusion protruding from the second ground conductor pattern portion. It is preferable that the first signal conductor pattern and the second signal conductor pattern are alternately arranged along the extending direction.

  With the above configuration, the interlayer connection conductor (first interlayer connection conductor) that conducts with the first ground conductor pattern portion and the interlayer connection conductor (second interlayer connection conductor) that conducts with the second ground conductor pattern portion via the holes. Therefore, unnecessary coupling between the first interlayer connection conductor and the second interlayer connection conductor is suppressed.

(8) In the transmission line according to any one of (1) to (7), the first signal conductor pattern and the second signal conductor pattern as viewed in the stacking direction of the insulator layer (in plan view). It is preferable to include an interlayer connection conductor that passes between the upper ground conductor pattern and the lower ground conductor pattern.

  With the above configuration, the electric potential between the upper ground conductor pattern and the lower ground conductor pattern is stabilized, and the coupling between the first transmission line portion and the second transmission line portion via the upper ground conductor pattern and the lower ground conductor pattern is suppressed. The

(9) In the transmission line according to any one of (1) to (8), the first signal conductor pattern is offset closer to the upper ground conductor pattern, and the second signal conductor pattern is the lower ground conductor pattern. It is preferable that the first signal conductor pattern and the second signal conductor pattern are formed in different insulator layers that are offset toward each other.

  With the above configuration, the spatial spacing between the first signal conductor pattern and the second signal conductor pattern is increased without increasing the width of the entire transmission line, and unnecessary coupling between the first signal conductor pattern and the second signal conductor pattern is achieved. Is suppressed.

(10) In the transmission line according to (9), the surface of the first signal conductor pattern facing the upper ground conductor pattern is smaller in surface roughness than the surface facing the lower ground conductor pattern. In the two-signal conductor pattern, it is preferable that the surface facing the lower ground conductor pattern has a smaller surface roughness than the surface facing the upper ground conductor pattern.

  With the above configuration, the concentration of the electromagnetic field intensity on the surface having a rough surface is alleviated, the conductor loss in the first and second signal conductor patterns is reduced, and the transmission loss of the transmission line is reduced.

(11) In the transmission line according to (9) or (10), a surface of the upper ground conductor pattern facing the first signal conductor pattern has a surface roughness smaller than that of the opposite surface, and the lower ground conductor pattern The surface facing the second signal conductor pattern preferably has a smaller surface roughness than the opposite surface.

  With the above configuration, the concentration of the electromagnetic field intensity on the rough surface is reduced, the conductor loss in the ground conductor pattern is reduced, and the transmission loss of the transmission line is reduced.

(12) In the transmission line according to (10) or (11), the first signal conductor pattern has a surface with a large surface roughness supported on an insulator layer, and the second signal conductor pattern has a surface roughness. It is preferable that a large surface is supported on the insulator layer.

  With the above configuration, the signal conductor pattern is less misaligned when the insulator layer is laminated or the cable is bent, and a change in characteristics due to the misalignment can be suppressed.

(13) In the transmission line according to any one of (10) to (12), the upper ground conductor pattern has a surface with a large surface roughness supported on an insulator layer, and the lower ground conductor pattern has a surface It is preferable that a surface having a large roughness is carried on the insulator layer.

  With the above configuration, the positional deviation of the ground conductor pattern is small when the insulator layer is laminated or the cable is bent, and the characteristic change accompanying the positional deviation can be suppressed.

(14) The flat cable of the present invention includes a transmission line and a connector connected to the transmission line, and the transmission line is the transmission line according to any one of (1) to (13), The connector is mounted on a laminated insulator of the transmission line.

  With the above-described configuration, a flat cable in which unnecessary coupling between a plurality of transmission line portions is suppressed and unnecessary radiation is suppressed while being small in size.

  According to the present invention, the first transmission line including the first signal conductor pattern, the upper ground conductor pattern, and the lower ground conductor pattern, and the second transmission line including the second signal conductor pattern, the upper ground conductor pattern, and the lower ground conductor pattern. Unnecessary binding to the surface is suppressed. Furthermore, even if the distance between the first signal conductor pattern and the second signal conductor pattern is relatively narrow, a predetermined isolation can be ensured, so that the width of the entire transmission line can be reduced.

FIG. 1A is an exploded perspective view of the transmission line 101 according to the first embodiment, and FIG. 1B is a perspective view of the transmission line 101. FIG. 2 is a cross-sectional view taken along a plane perpendicular to the signal propagation direction of the transmission line 101. FIG. 3 is an external perspective view of the flat cable 201 according to the first embodiment. FIG. 4 is a partial plan view showing each insulator layer included in the transmission line 101 and various conductor patterns formed thereon. FIG. 5A is a cross-sectional view of the portable electronic device showing a mounted state of the flat cable 201 according to the present embodiment, and FIG. 5B is a plan view of the inside of the casing of the portable electronic device. FIG. 6A is an exploded perspective view in the middle of formation of the transmission line according to the second embodiment, and FIG. 6B is a perspective view in the middle of formation of the transmission line. FIG. 6C is a perspective view of the transmission line 102. FIG. 7 is a cross-sectional view taken along a plane perpendicular to the signal propagation direction of the transmission line 102. FIG. 8A is an exploded perspective view of the transmission line 103 according to the third embodiment, and FIG. 8B is a perspective view of the transmission line 103. 9A is a cross-sectional view taken along the line AA in FIG. 8B, and FIG. 9B is a cross-sectional view taken along the line BB in FIG. 8B. FIG. 10 is a perspective view of a transmission line 104 according to the fourth embodiment. FIG. 11 is a plan view of the transmission line 104. 12A is a cross-sectional view taken along the line AA in FIG. 10, and FIG. 12B is a cross-sectional view taken along the line BB in FIG. FIG. 13 is an exploded perspective view of the transmission line 105 according to the fifth embodiment. 14A is a cross-sectional view taken along the line AA in FIG. 13, FIG. 14B is a cross-sectional view taken along the line BB in FIG. 13, and FIG. 14C is a cross-sectional view taken along the line C in FIG. FIG. 14D is a cross-sectional view taken along the line DD in FIG. 13. FIG. 15A is an exploded cross-sectional view of the transmission line 106 according to the sixth embodiment, and FIG. 15B is a cross-sectional view of the transmission line 106. FIG. 16 is an exploded cross-sectional view of the transmission line 107 according to the seventh embodiment.

  Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In the drawings, the same reference numerals are given to the same portions. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.

<< First Embodiment >>
FIG. 1A is an exploded perspective view of the transmission line 101 according to the first embodiment, and FIG. 1B is a perspective view of the transmission line 101. FIG. 2 is a cross-sectional view taken along a plane perpendicular to the signal propagation direction of the transmission line 101.

  The transmission line 101 includes a laminated insulator 10 in which a plurality of insulator layers 12, 13, 14, and 15 are laminated, and various conductors arranged along the insulator layers 12 to 15 inside the laminated insulator 10. Pattern.

  The conductor pattern includes an upper ground conductor pattern (21, 23) disposed along the insulator layer 12, a lower ground conductor pattern (22, 24) disposed along the insulator layer 15, and the insulator layer 14. The first signal conductor pattern 31 and the second signal conductor pattern 32 are disposed along the same.

  In the present embodiment, the upper ground conductor pattern includes an upper first ground conductor pattern portion 21 and an upper second ground conductor pattern portion 23. The lower ground conductor pattern includes a lower first ground conductor pattern portion 22 and a lower second ground conductor pattern portion 24.

  The said insulator layers 12, 14, and 15 are the insulator sheet | seat parts of the single-sided copper bonding insulator sheet | seat by which copper foil was affixed on the one side, for example. The insulator layer 13 is an insulator sheet. These insulator sheets are, for example, liquid crystal polymer (LCP) sheets. Since the liquid crystal polymer has a low dielectric constant, the capacitance component of the line can be suppressed even if the signal conductor pattern and the ground conductor pattern are brought close to each other. Moreover, since the dielectric loss tangent is low, transmission loss can be suppressed. Furthermore, since the temperature dependence of the dielectric loss tangent is low, a change in characteristics due to an environmental change can be suppressed. The various conductor patterns are obtained by patterning a copper foil affixed to the insulator sheet. The laminated insulator 10 is formed by laminating a plurality of these insulator sheets and thermocompression bonding.

  The first signal conductor pattern 31 and the second signal conductor pattern 32 are parallel to each other, and are extended and arranged in the longitudinal direction (the left-right direction in the direction shown in FIG. 1). The first signal conductor pattern 31 is disposed in a layer between the upper first ground conductor pattern portion 21 and the lower first ground conductor pattern portion 22, and the second signal conductor pattern 32 is the upper second ground conductor pattern portion 23. And a lower second ground conductor pattern portion 24.

  With the above configuration, the first transmission line portion WG1 is configured by the upper first ground conductor pattern portion 21, the lower first ground conductor pattern portion 22, and the first signal conductor pattern 31, and the upper second ground conductor pattern portion 23, the lower portion The second transmission line portion WG2 is configured by the second ground conductor pattern portion 24 and the second signal conductor pattern 32. If members other than the conductor are included, the first signal conductor pattern 31, the upper first ground conductor pattern portion 21, the lower first ground conductor pattern portion 22, and the insulator layers 12, 13, as the dielectric and support layers, 14 is also a component of the first transmission line section. Similarly, the second signal conductor pattern 32, the upper second ground conductor pattern portion 23, and the lower second ground conductor pattern portion 24, as well as the dielectric layers and the insulating layers 12, 13, and 14 as the support layers are also provided in the second transmission line portion. Is a component of

  The space | interval of the 1st signal conductor pattern 31 and the 2nd signal conductor pattern 32 does not need to be constant, and the 1st signal conductor pattern 31 and the 2nd signal conductor pattern 32 should just be mutually parallel. That is, the first signal conductor pattern 31 only needs to be extended along the second signal conductor pattern 32.

  A first hole H <b> 1 is formed between the first signal conductor pattern 31 and the second signal conductor pattern 32. The relative permittivity of the first hole H1 (air) is lower than the relative permittivity of the insulator layers 12-15. Therefore, even if the distance between the first signal conductor pattern 31 and the second signal conductor pattern 32 is relatively narrow, predetermined isolation can be ensured, so that the width of the entire transmission line can be reduced.

  In the present embodiment, since the upper ground conductor pattern (21, 23) is separated and the lower ground conductor pattern (22, 24) is separated, the crosstalk via the feedback current flowing in the ground conductor pattern is suppressed. The

  FIG. 3 is an external perspective view of the flat cable 201 according to the first embodiment. The flat cable 201 includes a transmission line 101 and coaxial connectors 61A, 61B, 62A, 62B mounted on the transmission line 101. The transmission line 101 includes a first transmission line part and a second transmission line part. The longitudinal direction of the transmission line 101 is the high-frequency signal transmission direction. Coaxial connectors 61A and 61B are provided at both ends of the first transmission line portion, and coaxial connectors 62A and 62B are provided at both ends of the second transmission line portion.

  FIG. 4 is a partial plan view showing each insulator layer included in the transmission line 101 and various conductor patterns formed thereon. A coaxial connector mounting inner conductor pattern 41 is formed on the insulator layers 12, 13 and 14, and a coaxial connector mounting inner conductor pattern 42 is formed on the insulator layers 12, 13 and 14. Coaxial connector mounting outer conductor patterns 51 and 52 are respectively formed on the insulator layers 12 and 13.

  An upper first ground conductor pattern portion 21 and an upper second ground conductor pattern portion 23 are respectively formed on the insulator layer 12, and a first signal conductor pattern 31 and a second signal conductor pattern 32 are respectively formed on the insulator layer 14. Thus, the lower first ground conductor pattern portion 22 and the lower second ground conductor pattern portion 24 are formed on the insulator layer 15.

  The coaxial connector mounting inner conductor pattern 41 formed in each insulator layer is electrically connected via the interlayer connection conductor VS1, and the coaxial connector mounting inner conductor pattern 42 is electrically connected via the interlayer connection conductor VS2. The coaxial connector mounting outer conductor pattern 51 is conducted through the interlayer connection conductor VG1, and the coaxial connector mounting outer conductor pattern 52 is conducted through the interlayer connection conductor VG2. The coaxial connector 61A (see FIG. 3) is mounted on and electrically joined to the coaxial connector mounting inner conductor pattern 41 and the coaxial connector mounting outer conductor pattern 51. The coaxial connector 62A is mounted on the coaxial connector mounting inner conductor pattern 42 and the coaxial connector mounting outer conductor pattern 52, and is electrically joined thereto. Although FIG. 4 illustrates a substantially half region of the transmission line 101, the configuration of the remaining half region is the same.

  The laminated insulator 10 having the cross-sectional structure shown in FIG. 2 is configured by laminating the insulating layers 12 to 15 on which the above various conductor patterns are formed and thermocompression bonding.

  A flexible flat cable 201 is configured by mounting the coaxial connector on the coaxial connector mounting portion of the laminated insulator 10.

  In this way, it is possible to reduce the width of the entire transmission line while suppressing crosstalk between the first transmission line part WG1 and the second transmission line part WG2.

  FIG. 5A is a cross-sectional view of the portable electronic device showing a mounted state of the flat cable 201 according to the present embodiment, and FIG. 5B is a plan view of the inside of the casing of the portable electronic device.

  The portable electronic device 1 includes a thin housing 2. In the case 2, circuit boards 3A and 3B, a battery pack 4 and the like are arranged. A plurality of ICs 5 and chip components 6 are mounted on the surfaces of the circuit boards 3A and 3B. The circuit boards 3A and 3B and the battery pack 4 are installed in the casing 2 so that the battery pack 4 is disposed between the circuit boards 3A and 3B when the casing 2 is viewed in plan. Since the housing 2 is formed as thin as possible, the distance between the battery pack 4 and the housing 2 in the thickness direction of the housing 2 is extremely narrow. Therefore, a normal coaxial cable cannot be arranged between them.

  The flat cable 201 according to the present embodiment can be passed between the battery pack 4 and the housing 2 by arranging the flat cable 201 so that the thickness direction thereof matches the thickness direction of the housing 2. it can. As a result, the circuit boards 3 </ b> A and 3 </ b> B that are spaced apart from each other with the battery pack 4 disposed in the middle can be connected by the flat cable 201.

  Further, the connection position of the flat cable 201 to the circuit boards 3A and 3B and the installation surface of the flat cable 201 to the battery pack 4 are different in the thickness direction of the housing 2, and the flat cable 201 must be bent and connected. Even if it is not necessary, it is applicable.

  Furthermore, since the flat cable 201 is small in the width direction, it is easy to place a plurality of transmission lines in parallel.

<< Second Embodiment >>
FIG. 6A is an exploded perspective view in the middle of formation of the transmission line according to the second embodiment, and FIG. 6B is a perspective view in the middle of formation of the transmission line. FIG. 6C is a perspective view of the transmission line 102. FIG. 7 is a cross-sectional view in a plane perpendicular to the signal propagation direction of the transmission line 102.

  The transmission line 102 includes a laminated insulator 10 in which a plurality of insulator layers 12, 13, 14, and 15 are laminated, and various conductors disposed along the insulator layers 12 to 15 inside the laminated insulator 10. Pattern.

  Unlike the first embodiment, in this embodiment, the holes H are only formed between the first signal conductor pattern 31 and the second signal conductor pattern 32 (first hole H1). Not between the upper first ground conductor pattern portion 21 and the upper second ground conductor pattern portion 23 and between the lower first ground conductor pattern portion 22 and the lower second ground conductor pattern portion 24. A hole H2 is formed.

  Further, unlike the first embodiment, in the present embodiment, the first hole H1 and the second hole H2 are connected, and a plurality of the first signal conductor pattern 31 and the second signal conductor pattern 32 are arranged along the extending direction. Has been placed. That is, a plurality of holes are not arranged in the signal propagation direction but are arranged at a predetermined interval.

  The transmission line 102 of this embodiment is manufactured by the following procedure.

(1) As shown in FIG. 6A, the insulator layer 13 and the insulator layers 12, 14, and 15 each having a predetermined conductor pattern are laminated.

(2) As shown in FIG. 6 (B), the laminate is integrated by hot pressing.

(3) As shown in FIG. 6C, holes H (slit-like through holes) are formed in the laminated body with a laser beam processing machine.

  Other configurations are as described in the first embodiment.

  According to this embodiment, the first ground conductor pattern portion and the second ground conductor pattern portion are separated, and the second hole is formed between the first ground conductor pattern portion and the second ground conductor pattern portion. By doing so, the coupling via the ground conductor pattern (the first ground conductor pattern portion and the second ground conductor pattern portion) is suppressed. Moreover, it becomes easier to bend while maintaining the mechanical strength as compared with the case where continuous slits are formed.

  If the large hole H is elongated in the longitudinal direction, the first transmission line part WG1 and the second transmission line part WG2 can be independently deformed at the part sandwiching the hole H. For example, the first transmission line part The part WG1 can be deformed upward and the second transmission line part WG2 can be deformed downward, so that the transmission line parts can be widened. In addition, this can further suppress crosstalk between the first transmission line unit WG1 and the second transmission line unit WG2.

<< Third Embodiment >>
FIG. 8A is an exploded perspective view of the transmission line 103 according to the third embodiment, and FIG. 8B is a perspective view of the transmission line 103. 9A is a cross-sectional view taken along the line AA in FIG. 8B, and FIG. 9B is a cross-sectional view taken along the line BB in FIG. 8B.

  In the present embodiment, the upper first ground conductor pattern portion 21 and the lower first ground conductor pattern portion 22 are electrically connected by the first interlayer connection conductor VG1, and the upper second ground conductor pattern 23 and the lower second ground conductor pattern are connected. The portion 24 is electrically connected to the second interlayer connection conductor VG2. Other configurations are as described in the second embodiment.

  According to the present embodiment, since the upper ground conductor patterns (21, 23) and the lower ground conductor patterns (22, 24) are separated from each other, each ground conductor pattern has a small area. However, by providing the first interlayer connection conductor VG1, the potentials of the upper first ground conductor pattern portion 21 and the lower first ground conductor pattern portion 22 are stabilized. Similarly, by providing the second interlayer connection conductor VG2, the potentials of the upper second ground conductor pattern 23 and the lower second ground conductor pattern portion 24 are stabilized. In addition, since a plurality of interlayer connection conductors VG1 and VG2 are interposed between the first signal conductor pattern 31 and the second signal conductor pattern 32, the first electromagnetic field shielding effect by the interlayer connection conductors VG1 and VG2 causes the first Isolation between the transmission line part WG1 and the second transmission line part WG2 is further ensured.

<< Fourth Embodiment >>
FIG. 10 is a perspective view of the transmission line 104 according to the fourth embodiment, and FIG. 11 is a plan view of the transmission line 104. 12A is a cross-sectional view taken along the line AA in FIG. 10, and FIG. 12B is a cross-sectional view taken along the line BB in FIG.

  In the present embodiment, when viewed in the stacking direction of the insulator layer (in plan view), in a region between the first signal conductor pattern 31 and the second signal conductor pattern 32 and where no hole H is formed, A first projecting portion PP1 projecting from the upper first ground conductor pattern portion 21 and the lower first ground conductor pattern portion 22 is provided. Similarly, an upper second ground conductor pattern portion 23 and a lower second ground conductor pattern portion 24 are formed between the first signal conductor pattern 31 and the second signal conductor pattern 32 and in a region where no hole H is formed. The second projecting portions PP2 projecting from the first projecting portion PP2 and the second projecting portion PP2 respectively.

  The upper and lower first protrusions PP1 are connected by a first interlayer connection conductor VG1, and the upper and lower second protrusions PP2 are connected by a second interlayer connection conductor VG2. The first protrusions PP1 and the second protrusions PP2 are alternately arranged along the extending direction of the first signal conductor pattern 31 and the second signal conductor pattern 32. Other configurations are as described in the second embodiment.

  According to the present embodiment, the following effects can be obtained.

(A) The interlayer connection conductors VG1 and VG2 are arranged without increasing the width of the entire transmission line.

(B) Since the protrusions PP1 and PP2 are arranged not in the side part of the transmission line but in the interior, unnecessary radiation is suppressed from the protrusion part and the interlayer connection conductor formed in the protrusion part.

(C) Since the first interlayer connection conductor VG1 and the second interlayer connection conductor VG2 are adjacent to each other through a hole, unnecessary coupling between the first interlayer connection conductor VG1 and the second interlayer connection conductor VG2 is suppressed. The

<< Fifth Embodiment >>
FIG. 13 is an exploded perspective view of the transmission line 105 according to the fifth embodiment. 14A is a cross-sectional view taken along the line AA in FIG. 13, FIG. 14B is a cross-sectional view taken along the line BB in FIG. 13, and FIG. 14C is a cross-sectional view taken along the line C in FIG. FIG. 14D is a cross-sectional view taken along the line DD in FIG. 13.

  In the present embodiment, the first signal conductor pattern 31, the second signal conductor pattern 32, and the first hole H1 are formed in the insulator layer 14. A second hole H2 is formed in each of the insulator layers 12 and 16. The first holes H1 and the second holes H2 are alternately arranged along the extending direction of the first signal conductor pattern 31 and the second signal conductor pattern 32.

  Ground connection conductors GL11 and GL21 are formed on the insulator layer 13, and ground connection conductors GL12 and GL22 are formed on the insulator layer 15, respectively.

  The insulating layer 12 includes an interlayer connection conductor VG1 connecting the upper first protrusion PP1 and the ground connection conductor GL11, and an interlayer connection conductor VG2 connecting the upper second protrusion PP2 and the ground connection conductor GL21. Is formed.

  The insulating layer 13 is formed with an interlayer connection conductor VG3 that is electrically connected to the ground connection conductor GL11 and an interlayer connection conductor VG4 that connects the ground connection conductor GL21.

  The insulating layer 14 is formed with an interlayer connection conductor VG5 that is electrically connected to the interlayer connection conductor VG3 and an interlayer connection conductor VG6 that connects the interlayer connection conductor VG4.

  The insulator layer 15 includes an interlayer connection conductor VG7 that connects the lower first protrusion PP1 and the ground connection conductor GL12, and an interlayer connection conductor VG8 that connects the lower second protrusion PP2 and the ground connection conductor GL22. Is formed.

  With the above structure, the upper first ground conductor pattern portion 21 and the lower first ground conductor pattern portion 22 are connected via the interlayer connection conductors VG1, VG3, VG5, VG7 and the ground connection conductors GL11, GL12. Similarly, the upper second ground conductor pattern portion 23 and the lower second ground conductor pattern portion 24 are connected via interlayer connection conductors VG2, VG4, VG6, VG8 and ground connection conductors GL21, GL22.

  According to the present embodiment, since the first holes H1 and the second holes H2 are dispersedly arranged, destruction based on these holes H1 and H2 is unlikely to occur. In addition, disconnection of the interlayer connection conductor is unlikely to occur when the transmission line is bent.

<< Sixth Embodiment >>
In the sixth embodiment, particularly, the position in the height direction in the cross section of the signal conductor pattern and the surface roughness of the signal conductor pattern will be described.

FIG. 15A is an exploded cross-sectional view of the transmission line 106 according to the sixth embodiment, and FIG. 15B is a cross-sectional view of the transmission line 106. Each is a cross-sectional view at a position where no void appears, as shown in FIG. 15A, the upper ground conductor pattern 21 is formed on the upper surface of the first insulator layer 12 and the lower surface is formed on the lower surface of the fourth insulator layer 15. A first signal conductor pattern 31 is formed on the upper surface of the ground conductor pattern 22 and the second insulator layer 13, and a second signal conductor pattern 32 is formed on the lower surface of the third insulator layer 14. Accordingly, the first signal conductor pattern 31 is offset toward the upper ground conductor pattern 21, and the second signal conductor pattern 32 is offset toward the lower ground conductor pattern 22.

  The surface of the first signal conductor pattern 31 facing the upper ground conductor pattern 21 is smaller in surface roughness than the surface facing the lower ground conductor pattern 22. The second signal conductor pattern 32 has a surface roughness smaller than that of the surface facing the lower ground conductor pattern 22 than the surface facing the upper ground conductor pattern portion 21. That is, the shiny surface of the first signal conductor pattern 31 faces the upper ground conductor pattern portion 21, and the shiny surface of the second signal conductor pattern 32 faces the lower ground conductor pattern 22.

  Since the electromagnetic field concentrates on the narrower side than the wider one between the signal conductor pattern and the ground conductor pattern, the above configuration reduces the concentration of the electromagnetic field intensity on the rough surface. As a result, the conductor loss of the signal conductor pattern and the conductor loss of the ground conductor pattern are reduced, and the transmission loss of the transmission lines WG1 and WG2 is reduced.

  Further, the spatial distance between the first signal conductor pattern 31 and the second signal conductor pattern 32 is increased without increasing the width of the entire transmission line, and the first transmission line portion WG1 and the second transmission line portion WG2 are isolated from each other. Increase.

  The first signal conductor pattern 31 has a second surface (matt surface) with a rough surface carried on the second insulator layer 13, and the second signal conductor pattern 32 has a third surface with a rough surface. Since it is carried by the insulator layer 14, it can be laminated with a high bonding strength between the insulator layer and the copper foil. Similarly, the upper ground conductor pattern 21 has a surface with a rough surface carried on the first insulator layer 12, and the lower ground conductor pattern 22 has a surface with a rough surface carried on the third insulator layer 14. Therefore, the insulating layer and the copper foil can be laminated with a high bonding strength. Therefore, the signal conductor pattern is less misaligned when the insulator layer is laminated or when the cable is bent, and a change in characteristics due to the misalignment can be suppressed.

  In each of the embodiments described above, the first ground conductor pattern portion along the first signal conductor pattern and the second ground conductor pattern along the second signal conductor pattern for both the upper ground conductor pattern and the lower ground conductor pattern. However, as in the sixth embodiment, the upper ground conductor pattern and the lower ground conductor pattern are not separated, and the first transmission line portion WG1 and the second transmission line portion WG2 are not separated. You may combine.

  The structure related to the position in the height direction in the cross section of the signal conductor pattern and the structure related to the surface roughness of the signal conductor pattern can also be applied to a transmission line that does not include the first hole H1 and the second hole H2. Have the same effect.

<< Seventh Embodiment >>
In the seventh embodiment, the surface roughness of the signal conductor pattern and the ground conductor pattern is particularly shown.

  FIG. 16 is an exploded cross-sectional view of the transmission line 107 according to the seventh embodiment.

  As shown in FIG. 16, the upper ground conductor pattern 21 is formed on the lower surface of the first insulator layer 11, the lower ground conductor pattern 22 is formed on the upper surface of the sixth insulator layer 16, and the first signal conductor is formed on the upper surface of the third insulator layer 13. A second signal conductor pattern 32 is formed on the lower surface of the pattern 31 and the fourth insulator layer 14. Accordingly, the first signal conductor pattern 31 is offset toward the upper ground conductor pattern 21, and the second signal conductor pattern 32 is offset toward the lower ground conductor pattern 22.

  The upper ground conductor pattern 21 has a shiny surface facing the first signal conductor pattern 31, and the lower ground conductor pattern 22 has a shiny surface facing the second signal conductor pattern 32.

  With the above configuration, the concentration of the electromagnetic field intensity on the rough surface is avoided not only for the signal conductor pattern but also for the ground conductor pattern. As a result, the conductor loss of the ground conductor pattern is also reduced, and the transmission loss of the transmission lines WG1 and WG2 is reduced.

  The structure related to the surface roughness of the signal conductor pattern and the ground conductor pattern described above can be applied to a transmission line that does not include the first hole H1 and the second hole H2, and has the same effect.

<< Other embodiments >>
In each of the embodiments described above, for both the upper ground conductor pattern and the lower ground conductor pattern, the first ground conductor pattern portion along the first signal conductor pattern and the second ground conductor along the second signal conductor pattern. The example separated into the pattern part and the example in which neither the upper ground conductor pattern nor the lower ground conductor pattern is separated and used as both the first transmission line part and the second transmission line part are shown. One of the ground conductor pattern and the lower ground conductor pattern may be separated into a first ground conductor pattern portion along the first signal conductor pattern and a second ground conductor pattern portion along the second signal conductor pattern.

  In some of the embodiments described above, between the upper first ground conductor pattern portion and the upper second ground conductor pattern portion, and between the lower first ground conductor pattern portion and the lower second ground conductor pattern portion. However, the second holes H2 may be formed only in one of the upper part and the lower part.

  Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. For example, partial replacements or combinations of the configurations shown in the different embodiments are possible. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

GL11, GL12, GL21, GL22 ... ground connection conductor H ... hole H1 ... first hole H2 ... second hole PP1 ... first protrusion PP2 ... second protrusions VG1 to VG8 ... interlayer connection conductors VS1, VS2 ... Interlayer connection conductor WG1 ... 1st transmission line part WG2 ... 2nd transmission line part 2 ... Housing 3A, 3B ... Circuit board 4 ... Battery pack 5 ... IC
6 ... Chip component 10 ... Laminated insulators 11-16 ... Insulator layer 21 ... Upper first ground conductor pattern portion, upper ground conductor pattern 22 ... Lower first ground conductor pattern portion, lower ground conductor pattern 23 ... Upper second ground Conductor pattern portion 24 ... Lower second ground conductor pattern portion 31 ... First signal conductor pattern 32 ... Second signal conductor patterns 41, 42, 51, 52 ... Coaxial connector mounting outer conductor patterns 61A, 61B, 62A, 62B ... Coaxial Connectors 101-107 ... Transmission line 201 ... Flat cable

Claims (14)

A laminated insulator in which a plurality of insulator layers are laminated;
A conductor pattern disposed along the insulator layer in the laminated insulator;
With
The conductor pattern includes an upper ground conductor pattern, a lower ground conductor pattern, a first signal conductor pattern and a second signal conductor pattern having portions parallel to each other,
The upper ground conductor pattern and the lower ground conductor pattern sandwich the first signal conductor pattern and the second signal conductor pattern in the stacking direction of the insulator layer in a part of the parallel portion,
A transmission line comprising a first hole formed between the first signal conductor pattern and the second signal conductor pattern.   2. The transmission line according to claim 1, wherein a plurality of the first holes are arranged along an extending direction of the first signal conductor pattern and the second signal conductor pattern. At least one of the upper ground conductor pattern and the lower ground conductor pattern is separated into a first ground conductor pattern portion along the first signal conductor pattern and a second ground conductor pattern portion along the second signal conductor pattern. And
The transmission line according to claim 1 or 2, wherein a second hole is formed between the first ground conductor pattern portion and the second ground conductor pattern portion.   4. The transmission line according to claim 3, wherein a plurality of the second holes are arranged along an extending direction of the first signal conductor pattern and the second signal conductor pattern. 5.   The transmission line according to claim 3 or 4, wherein the first hole and the second hole are continuous. The first ground conductor pattern portion or the second ground conductor pattern portion is between the first signal conductor pattern and the second signal conductor pattern as viewed in the stacking direction of the insulator layer, and the second signal conductor pattern. Having a protruding portion protruding in a region where no void is formed,
The transmission line according to claim 3, further comprising an interlayer connection conductor formed on the projecting portion and connecting the upper ground conductor pattern and the lower ground conductor pattern.   The projecting portion includes a first projecting portion projecting from the first ground conductor pattern portion, and a second projecting portion projecting from the second ground conductor pattern portion, the first signal conductor pattern and the second signal conductor pattern. The transmission line according to claim 6, wherein the transmission lines are alternately arranged along the extending direction.   An interlayer connection conductor that passes between the first signal conductor pattern and the second signal conductor pattern and connects the upper ground conductor pattern and the lower ground conductor pattern when viewed in the stacking direction of the insulator layer is provided. The transmission line according to claim 1.   The first signal conductor pattern is offset closer to the upper ground conductor pattern, the second signal conductor pattern is offset closer to the lower ground conductor pattern, and the first signal conductor pattern is different from the second signal conductor pattern. The transmission line according to claim 1, wherein the transmission line is formed on an insulator layer. The surface of the first signal conductor pattern facing the upper ground conductor pattern is smaller in surface roughness than the surface facing the lower ground conductor pattern,
10. The transmission line according to claim 9, wherein a surface of the second signal conductor pattern facing the lower ground conductor pattern has a surface roughness smaller than that of a surface facing the upper ground conductor pattern. The surface of the upper ground conductor pattern that faces the first signal conductor pattern has a smaller surface roughness than the opposite surface.
11. The transmission line according to claim 9, wherein a surface of the lower ground conductor pattern facing the second signal conductor pattern has a surface roughness smaller than that of the opposite surface.   The surface of the first signal conductor pattern having a large surface roughness is carried on an insulator layer, and the surface of the second signal conductor pattern is carried by an insulator layer. A transmission line as described in 1.   The surface of the upper ground conductor pattern having a large surface roughness is carried on an insulator layer, and the surface of the lower ground conductor pattern is carried by an insulator layer. The transmission line according to crab. It consists of a transmission line and a connector connected to the transmission line,
The transmission line is the transmission line according to any one of claims 1 to 13,
The flat cable, wherein the connector is mounted on a laminated insulator of the transmission line.

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