JP2016131375A - High-frequency line and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat cable which has no bent part formed in the cable and enables substantially linear wiring so as not to change characteristics, and an electronic apparatus with the same.SOLUTION: A flat cable includes: a long first ground conductor; a long signal line conductor 30 arranged opposed to the first ground conductor across a first base material sheet; and a long second ground conductor 20 which is arranged opposed to the signal line conductor 30 across a second base material sheet 52 and has a plurality of opening parts 20A along a longitudinal direction. The first ground conductor 10, the signal line conductor 30, and the second ground conductor 20 have, in at least a part along the longitudinal direction, a narrow-width part 1B whose width in a width direction orthogonal to the longitudinal direction is thinner than other regions. An opening part 20A formed at the narrow-width part 1B is made smaller than opening parts 20A formed in the other regions.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a thin high-frequency line for transmitting a high-frequency signal, and an electronic apparatus including the same.

  Conventionally, a coaxial cable has been used as a high-frequency line for transmitting a high-frequency signal. However, in recent years, with the reduction in size and thickness of high-frequency devices including mobile communication terminals, there is a problem that it is difficult to secure a space for arranging the coaxial cable in the terminal housing. Therefore, flat cables as shown in Patent Document 1 and Patent Document 2 have been proposed.

  The flat cables described in Patent Document 1 and Patent Document 2 have a flat shape whose thickness direction is thinner than the width direction. For this reason, even if it is a case where a coaxial cable cannot be arrange | positioned in the space between components or the space between components and a housing | casing in a terminal housing | casing, if it is a flat cable of patent document 1 and patent document 2, It can be arranged, and miniaturization of the device is not hindered.

  FIG. 10 is a diagram showing a configuration of a flat cable as shown in Patent Literature 1 and Patent Literature 2. As shown in FIG. The flat cable 1P is a flat cable that is thinner in the thickness direction than in the width direction, and FIG. 10 shows a partial configuration in the length direction. The flat cable 1P includes a base sheet made of a flexible insulating material such as polyimide or liquid crystal polymer. This base material sheet is omitted in FIG. The flat cable 1P includes a first ground conductor 10 and a second ground conductor 20 that are arranged with a base sheet sandwiched from the thickness direction and extend along the length direction of the flat cable 1P.

  The first ground conductor 10 is a so-called solid ground serving as a reference potential, and is a flat conductor. The second ground conductor 20 is a ladder-shaped flat conductor provided with a plurality of openings 20A formed along the length direction of the flat cable 1P. Specifically, the second ground conductor 20 includes the long conductors 21 and 22 arranged in parallel at a predetermined distance in the width direction of the flat cable 1P, and the bridge conductor 23 that partially connects the long conductors 21 and 22. And. A plurality of bridge conductors 23 are provided along the width direction of the flat cable 1 </ b> P and spaced apart along the length direction. The opening 20 </ b> A described above is a region surrounded by the long conductors 21 and 22 and the bridge conductor 23.

  The flat cable 1P includes a signal line conductor 30A that is a signal line conductor of the flat cable 1P. The signal line conductor 30A is provided in the base sheet and is positioned between the long conductors 21 and 22 when viewed from the thickness direction of the base sheet. The first ground conductor 10 and the second ground conductor 20 are electrically connected through via conductors 41 and 42 provided on the base sheet.

International Publication No. 2011/007660 Utility Model Registration No. 3173143

  The flat cable 1P which is thinner than the coaxial cable enables wiring even when the space in the terminal housing is thin. However, since a large number of various electronic components are mounted in the terminal housing, the flat cable 1P needs to be wired avoiding these electronic components, and there is a problem that the cable length becomes long. In addition, it is necessary to bend the cable in order to avoid the electronic components, and there is a problem that the insertion loss of the flat cable 1P increases at the bent portion or the characteristic impedance is not matched.

  Therefore, an object of the present invention is to provide a high-frequency line that can be wired substantially linearly without forming a bent portion so as not to change the characteristics, and an electronic device including the same.

  The high-frequency line according to the present invention includes a base material, a signal line conductor provided on the base material, a signal line conductor and the base material facing each other, and a plurality of openings along the direction in which the signal line conductor extends. A ground conductor having a wide portion and a narrow portion having substantially the same shape along a direction in which the signal line conductor extends. An interlayer connection conductor connected to the conductor is further provided, and the interlayer connection conductor is formed in the wide portion of the base material and is not formed in the narrow portion of the base material.

  According to this configuration, even if there is a component mounted on the board on the wiring path of the high-frequency line, if the component can be positioned in a narrow portion formed in the high-frequency line, the high-frequency line avoids the component. There is no need to fold it. Further, with this configuration, even when the narrow portion is bent, the possibility that the interlayer connection conductor is damaged can be suppressed. Note that the high-frequency line may be arranged so that the narrow portion coincides with the part position. Thereby, since the high frequency line can be arranged almost linearly, it is possible to avoid the problem that the insertion loss of the high frequency line is increased at the bent portion or the characteristic impedance is not matched.

  The bending angle of the center line in the width direction of the signal line conductor is preferably an angle that does not change the transmission mode of the high-frequency signal to be transmitted.

  In this configuration, since the bending angle is small, a high-frequency signal can be transmitted in a single transmission mode. Thereby, degradation of transmission loss can be suppressed.

  In addition, the signal line conductor may have a thin line portion in which the length in the width direction orthogonal to the direction in which the signal line conductor extends is narrower than the other region at the narrow portion of the base material.

  It is preferable that both end portions in the longitudinal direction of the line details are inclined so that the length in the width direction gradually decreases from both ends in the longitudinal direction toward the center.

  In this configuration, since the width is gradually narrowed, it is possible to suppress an abrupt change in impedance in line details.

  Further, the opening is preferably provided at a position facing the thin line portion, and the length of the opening in the direction in which the signal line conductor extends is preferably smaller than the length of the opening in the other region.

  With this configuration, it is possible to realize a distribution of characteristic impedance corresponding to the shape of the signal line conductor.

  It is preferable that the width in the width direction of the opening facing each position changes continuously or stepwise from the thin line portion to the other region.

  With this configuration, it is possible to suppress a rapid change in characteristic impedance from the thin line portion to another region.

  The ground conductor preferably has a configuration in which the width in the width direction of the opening formed in the narrow portion of the base material is smaller than the length in the width direction of the opening formed in the wide width portion of the base material.

  Furthermore, it is desirable that the total width of the ground conductor and the signal line conductor in the narrow portion of the substrate is smaller than the total width of the ground conductor and the signal line conductor in the wide portion.

  According to another aspect of the present invention, there is provided an electronic apparatus comprising the above-described high-frequency line and a plurality of electronic components wired by the high-frequency line.

  This configuration shows an electronic device using the above-described high-frequency line. By using the above-described high-frequency line, if the position of the thin line portion is set appropriately according to the mode between the electronic parts that make up the electronic device, the electronic parts can be connected to each other without bending the high-frequency line in plan view. it can.

  A mounting component may be disposed between the plurality of electronic components, and the mounting component may be disposed in the vicinity of the thin line portion.

  In this structure, the specific aspect of the electronic device in which the above-mentioned high frequency track is utilized most effectively is shown.

  Between the plurality of electronic components, a member to which the plurality of electronic components can be connected is disposed by bending the high-frequency line, and the high-frequency line has a configuration in which the thin line portion is a bent portion. Also good.

  This configuration shows a case where the high-frequency line must be bent along the thickness direction. At this time, the high-frequency line can be easily bent and connected to the electronic component by bending the thin wire portion.

  According to the present invention, since the high-frequency line can be arranged almost linearly, it is possible to avoid the problem that the insertion loss of the high-frequency line is increased at the bent portion or the characteristic impedance is not matched.

(A) is an external appearance perspective view of the connector cable which consists of a flat cable which concerns on Embodiment 1, (B) is a top view. Sectional drawing of the II-II line | wire of FIG. The top view of the 1st base material sheet in the broken-line area | region P1 of FIG. The top view of the 2nd base material sheet in the broken-line area | region P1 of FIG. FIG. 3 is a cross-sectional plan view of an electronic device wired with the connector cable according to the first embodiment. FIG. 6 is an external perspective view of a connector cable made of a flat cable according to the second embodiment. (A) is a top view of the 1st base material sheet in broken line field P2 of Drawing 6, (B) is a top view of the 2nd base material sheet. Side surface sectional drawing of the electronic device wired with the connector cable which concerns on embodiment. The figure which shows the connector cable in the broken-line area | region P3 shown in FIG. The figure which shows the structure of a flat cable as shown to patent document 1 and patent document 2. FIG.

(Embodiment 1)
FIG. 1A is an external perspective view of a connector cable made of a flat cable according to this embodiment, and FIG. 1B is a top view. 2 is a cross-sectional view taken along line II-II in FIG. In FIG. 1 and FIG. 2, the X axis, the Y axis, and the Z axis are used to explain the X axis as the width direction of the connector cable 60, the Y axis as the length direction, and the Z axis as the thickness direction. Moreover, below, the same code | symbol is used about the same member as the flat cable 1P demonstrated in FIG.

  The connector cable 60 includes a flat cable 1 and a coaxial connector 61. As shown in FIG. 2, the flat cable 1 includes a first ground conductor 10, a first base sheet 51, a signal line conductor 30, a second base sheet 52, and a second ground conductor 20 in order along the Z-axis direction. Are laminated. The first ground conductor 10, the signal line conductor 30, and the second ground conductor 20 are made of a highly conductive material such as copper (Cu). The first base sheet 51 and the second base sheet 52 are thermoplastic resin sheets made of a flexible insulating material such as liquid crystal polymer or polyimide. By bonding the first substrate sheet 51 and the second substrate sheet 52, the “substrate” of the present invention is realized. The first ground conductor 10 corresponds to “another ground conductor” of the present invention and can be omitted. The second ground conductor 20 corresponds to the “ground conductor” of the present invention.

  The first ground conductor 10 is formed on the upper surface (the surface on the positive direction side of the Z axis) of the first base sheet 51. The signal line conductor 30 is formed on the upper surface of the second base sheet 52, and the second ground conductor 20 is formed on the lower surface. The first base sheet 51 and the second base sheet 52 are laminated and heat-pressed so that the signal line conductor 30 is sandwiched between the first ground conductor 10 and the second ground conductor 20. Protective layers 110 and 120 are provided outside the first ground conductor 10 and the second ground conductor 20.

  The first ground conductor 10 of the flat cable 1 has a connector part in which openings 11 are formed at both ends in the longitudinal direction. A connector terminal (not shown) is formed in the opening 11. The connector terminal is electrically connected to the signal line conductor 30 by a via conductor (interlayer connection conductor) 45 formed in the first base sheet 51. The coaxial connector 61 is attached to the connector portion of the first ground conductor 10. The central conductor of the coaxial connector 61 is electrically connected to the signal line conductor 30 through the via conductor 45. The flat cable 1 includes a conversion unit ground conductor 25 on the second ground conductor 20 side in the connection region of the coaxial connector 61.

  The formation of each via conductor 45 will be described. First, a through hole is formed in the first base sheet 51 by laser or punch. Then, the formed through hole is filled with a conductive paste (for example, containing silver (Ag) as a main component). Then, when the first base sheet 51 is laminated and thermocompression bonded, the filled conductive paste is metalized and becomes the via conductor 45. That is, the metallization of the conductive paste can be performed at the same time as the first base sheet 51 and the second base sheet 52 are thermocompression bonded.

  As shown in FIG. 1B, the connector cable 60 is formed such that a line connecting the coaxial connectors 61 arranged at both ends of the flat cable 1 is in a straight line. The flat cable 1 has a wide portion 1A having a width (length in the X-axis direction) longer than the others and a narrow portion 1B having a width shorter than the others. The narrow portion 1B corresponds to line details according to the present invention.

  Since the flat cable 1 has the narrow portion 1B, the narrow portion 1B of the flat cable 1 is positioned on the wiring path of the flat cable 1 even when there is a component mounted on the board, for example. Therefore, it is not necessary to bend the flat cable 1 in order to avoid parts.

  The narrow portion 1B is inclined at both ends (or one end) in the Y-axis direction. That is, the narrow portion 1B is formed such that the width of the flat cable 1 gradually narrows from both ends toward the center of the narrow portion 1B. Thereby, a sudden change in impedance in the narrow portion 1B can be prevented. At this time, not only the width of the flat cable is narrowed, but also the shape of the signal line conductor and the shape of the opening are gradually narrowed.

  FIG. 3 is a plan view of the first base sheet 51 in the broken line region P1 of FIG. FIG. 4 is a plan view of the second base sheet 52 in the broken line region P1 of FIG. 3 and 4 are views seen from the positive direction of the Z axis.

  The first base sheet 51 is a single-sided copper-clad sheet, and the first ground conductor 10 is formed on the upper surface. The first base sheet 51 and the first ground conductor 10 have substantially the same shape, and both have a wide portion 1A and a narrow portion 1B along the longitudinal direction.

  The second base sheet 52 is a double-sided copper-clad sheet, in which the signal line conductor 30 is formed on the upper surface, and the second ground conductor 20 is formed on the lower surface. The second base sheet 52, the second ground conductor 20, and the signal line conductor 30 have a wide portion 1A and a narrow portion 1B along the longitudinal direction. The signal line conductor 30 may be formed on the lower surface of the first base sheet 51 using the first base sheet 51 as a double-sided copper-clad sheet.

  The signal line conductor 30 has a long shape extending in the Y-axis, and both ends in the Y-axis direction are electrically connected to the central conductor of the coaxial connector 61 through the via conductor 45 and the connector terminal of the first ground conductor 10. ing. The signal line conductor 30 has a plurality of wide portions 31 having a large width and narrow portions 32 having a small width along the longitudinal direction. The wide portion 31 faces the opening 20 </ b> A of the second ground conductor 20, and the narrow portion 32 faces the bridge conductor 23 of the second ground conductor 20.

  The wide portion 31 is shorter than the width (length in the X-axis direction) and the length (length in the Y-axis direction) of the opening 20A facing each other, and in the thickness direction with the long conductors 21 and 22 and the bridge conductor 23. It has a size that does not overlap. As will be described later, the width and length of the opening 20A are changed by the wide portion 1A and the narrow portion 1B. The width and length of the wide portion 31 facing the opening 20A are changed according to the width and length of the opening 20A. Specifically, the ratio of the wide part 1A to the opening 20A formed in the wide part 1A and the ratio of the wide part 31 to the opening 20A formed in the narrow part 1B are approximately It is the same. Thereby, the characteristic impedance of the flat cable 1 to be described later can be prevented from changing even when the wide portion 1A and the narrow portion 1B are formed.

  The wide portion 31 is inclined at both ends in the Y-axis direction so that the impedance of the signal line conductor 30 does not change sharply at the wide portion 31. Thereby, it is possible to reduce reflection loss due to a sudden change in impedance.

  The narrow portion 32 is longer than the width of the opposing bridge conductor 23 (the length in the Y-axis direction). As a result, the wide portion 31 of the signal line conductor 30 faces the bridge conductor 23 of the second ground conductor 20 even when the second ground conductor 20 and the signal line conductor 30 are misaligned in the Y-axis direction. This can be prevented, and it is possible to suppress the impedance from changing due to the wide portion 31 and the bridge conductor 23 facing each other.

  The second ground conductor 20 has a strip shape that is long in the Y-axis direction, and has a plurality of openings 20A along the Y-axis direction. As described with reference to FIG. 10, the opening 20 </ b> A is formed by the long conductors 21 and 22 and the bridge conductor 23. The size of the opening 20A is appropriately changed depending on whether the region to be formed is the wide portion 1A or the narrow portion 1B. Specifically, the opening 20A formed in the narrow portion 1B is shorter in width and length than the opening 20A formed in the wide portion 1A.

  The flat cable 1 configured as described above is manufactured, for example, as follows. First, the 1st ground conductor 10 which has the wide part 1A and the narrow part 1B is patterned by the strip | belt-shaped 1st base material sheet 51 in the state in which the wide part 1A and the narrow part 1B are not formed. Further, the second ground conductor 20 and the signal line conductor 30 having the wide portion 1A and the narrow portion 1B are patterned on the band-shaped second base sheet 52 in a state where the wide portion 1A and the narrow portion 1B are not formed. The Thereafter, the first base sheet 51 and the second base sheet 52 are bonded together by a roll-to-roll method. Then, the 1st base material sheet 51 and the 2nd base material sheet 52 are separated into pieces, and the flat cable 1 which has the wide part 1A and the narrow part 1B is manufactured.

  Below, the characteristic impedance of the flat cable 1 is demonstrated.

  In the region where the opening 20A is formed, a capacitor component is formed between the wide portion 31 of the signal line conductor 30 and the long conductors 21 and 22. The capacitor component formed at this time is lower than the capacitor component formed between the second ground conductor 20 and the second ground conductor 20 when there is no opening 20A. Therefore, the impedance of the flat cable 1 in this region is higher than when there is no opening 20A.

  In the region where the bridge conductor 23 is formed, a capacitor component is formed between the narrow portion 32 of the signal line conductor 30 and the bridge conductor 23. The width of the bridge conductor 23 is designed such that the capacitor component formed is higher than the capacitor component formed between the wide portion 31 of the signal line conductor 30 and the long conductors 21 and 22. Thereby, the impedance of the flat cable 1 in this region is lower than the impedance in the region where the opening 20A is formed.

  In this way, the characteristic impedance of the flat cable 1 is adjusted to a desired value by alternately providing a section with a high impedance and a section with a low impedance. For example, when the characteristic impedance of the flat cable 1 is adjusted to 50Ω, a flat cable 1 full length (coaxial connectors 61, 61) is formed by forming a section having an impedance larger than 50Ω and a section having an impedance smaller than 50Ω. Between the terminals where the is mounted) to 50Ω.

  Further, the ratio of the wide portion 31 to the opening 20A formed in the wide portion 1A and the ratio of the narrow portion 32 to the opening 20A formed in the narrow portion 1B are made substantially constant. Thus, it is possible to avoid the impedance from changing depending on the size of the opening 20A. As a result, the characteristic impedance over the entire length of the flat cable 1 can be prevented from changing.

  The connector cable 60 having the flat cable 1 manufactured as described above is thin and flexible, and has excellent transmission characteristics as a high-frequency line. This connector cable 60 can be used for the following electronic devices. FIG. 5 is a cross-sectional plan view of an electronic device wired with the connector cable 60 according to the present embodiment.

  The portable electronic device 70 includes a thin device casing 71. In the device casing 71, mounted circuit boards 72A, 72B, 72C and a battery pack 73 are arranged. A plurality of IC chips 74, mounting components 75, and pins 76 are mounted on the surface of the mounting circuit boards 72A, 72B, 72C. The mounting circuit boards 72A, 72B, 72C and the battery pack 73 are arranged such that the battery pack 73 is disposed between the mounting circuit boards 72A, 72B in plan view of the device casing 71, and the mounting circuit board 72C is disposed on the upper surface side of the battery pack 73. Is installed in the device casing 71 so that the. Here, since the device housing 71 is formed as thin as possible, the distance between the battery pack 73 and the device housing 71 is extremely narrow in the thickness direction of the device housing 71. Therefore, a coaxial cable cannot be arranged between them.

  However, the connector cable 60 shown in the present embodiment is arranged so that the thickness direction of the connector cable 60 and the thickness direction of the device housing 71 coincide with each other, so that the battery pack 73 and the device housing 71 are connected to each other. A connector cable 60 can be passed between them. As a result, the mounted circuit boards 72A and 72B which are spaced apart from each other with the battery pack 73 disposed in the middle can be connected by the connector cable 60.

  Further, although the connector cable 60 passes over the mounting circuit board 72C, the narrow part 1B is positioned on the mounting parts 75, the pins 76, and the land parts of the mounting parts 75 mounted on the mounting circuit board 72C. The connector cable 60 can be arranged in a straight line while avoiding the mounting component 75 and the like. By arranging the connector cable 60 in a straight line, an unnecessary bent portion is not generated, so that the problem that the insertion loss of the connector cable 60 increases at the bent portion or the characteristic impedance is not matched can be avoided.

(Embodiment 2)
FIG. 6 is an external perspective view of a connector cable made of a flat cable according to the present embodiment. The connector cable 60A according to the present embodiment has the same configuration as that of the first embodiment, but has a different shape. In the first embodiment, the flat cable 1 has a wide portion 1A having a wide width and a narrow portion 1B having a narrow width. However, the connector cable 60A according to the present embodiment has a wide portion 1A extending over the entire longitudinal direction. It has a width and a narrow portion 1B is formed in part. Since this narrow part 1B is narrower than the wide part 1A, it is easy to bend in the thickness direction (Z-axis direction).

  7A is a plan view of the first base sheet 51 in the broken line region P2 of FIG. 6, and FIG. 7B is a plan view of the second base sheet 52. 7A and 7B are views seen from the positive direction of the Z axis.

  The first base sheet 51 is a single-sided copper-clad sheet, and the first ground conductor 10 is formed on the upper surface (the surface on the positive side of the Z axis). The first base sheet 51 is formed with via conductors (interlayer connection conductors) 41 and 42 that conduct the first ground conductor 10 and the second ground conductor 20. The via conductors 41 and 42 are formed in the wide portion 1A.

  The second base sheet 52 is a double-sided copper-clad sheet, in which the signal line conductor 30 is formed on the upper surface, and the second ground conductor 20 is formed on the lower surface. As in the first embodiment, the second ground conductor 20 and the signal line conductor 30 have an opening 20A formed in the narrow portion 1B and a wide portion 31 in the opening 20A formed in the wide portion 1A. And smaller than the size of the wide portion 31. Further, the ratio of the wide part 31 to the opening 20A formed in the wide part 1A and the ratio of the wide part 31 to the opening 20A formed in the narrow part 1B are almost the same. The same.

  Via conductors 41 and 42 that conduct the first ground conductor 10 and the second ground conductor 20 are formed in the first base sheet 51 and the second base sheet 52. The via conductors 41 and 42 are formed in the vicinity of the bridge conductor 23 formed in the wide portion 1A, and are not formed in the region of the narrow portion 1B.

  The formation of the via conductors 41 and 42 will be described. First, through holes are formed in the first base sheet 51 and the second base sheet 52 by laser or punching. Then, the formed through hole is filled with a conductive paste (for example, containing silver (Ag) as a main component). And when the 1st base material sheet 51 and the 2nd base material sheet are laminated and thermocompression-bonded, the filled conductive paste is metallized and becomes via conductors 41 and 42. That is, the metallization of the conductive paste can be performed at the same time as the first base sheet 51 and the second base sheet 52 are thermocompression bonded.

  Since the narrow portion 1B is narrower than the wide portion 1A, it becomes a bent portion of the flat cable 1. For this reason, when the via conductors 41 and 42 are formed in the narrow portion 1B, the via conductors 41 and 42 may be damaged by the stress applied when the flat cable 1 is bent. Therefore, the problem of breakage can be avoided by not forming the via conductors 41 and 42 in the narrow portion 1B.

  In the narrow portion 1B, the total width of each of the first ground conductor 10, the second ground conductor 20, and the signal line conductor 30 is equal to the first ground conductor 10, the second ground conductor 20, and the signal line conductor 30 in the wide portion 1A. Less than the sum of the respective widths. The widths of the first base sheet 51, the second base sheet 52, and the protective layers 110 and 120 are also narrower in the narrow part 1B than in the wide part 1A. Therefore, the narrow portion 1B is softer and easier to bend than the wide portion 1A.

  FIG. 8 is a side sectional view of an electronic device wired with the connector cable 60A according to the present embodiment. FIG. 9 is a diagram showing the connector cable 60A in the broken line area P3 shown in FIG.

  Mounted circuit boards 72A and 72B and a battery pack 73 are arranged in a thin device casing 71 included in the portable electronic device 70. A battery pack 73 is disposed between the mounted circuit boards 72A and 72B. Further, the mounting surfaces of the mounting circuit boards 72A and 72B on which the plurality of IC chips 74 and mounting components 75 are mounted are at a position lower than the height of the battery pack 73. For this reason, when wiring between the mounting circuit boards 72A and 72B with the connector cable 60A, it is necessary to bend the connector cable 60A.

  Since the connector cable 60A according to the present embodiment has the narrow portion 1B, the connector cable 60A is easily bent at the narrow portion 1B as shown in FIG. Thereby, the connector cable 60 </ b> A can be passed between the battery pack 73 and the device casing 71. As a result, the mounted circuit boards 72A and 72B that are spaced apart from each other with the battery pack 73 disposed in the middle can be connected by the connector cable 60A. Since the via conductors 41 and 42 are not formed in the narrow portion 1B serving as the bent portion, damage to the via conductors 41 and 42 can be avoided.

  As described above, in the present embodiment, since the flat cable can be arranged substantially linearly, it is possible to avoid the problem that the insertion loss of the flat cable is increased at the bent portion or the characteristic impedance is not matched. Moreover, since it can be bent with respect to the thickness direction (Z-axis direction), wiring is possible even if there is a height difference in the wiring space.

  In the flat cable 1, the via conductor that conducts the first ground conductor 10 and the second ground conductor 20 may be formed in advance in the thermoplastic resin sheet before being bonded, or a hole is formed, After the sheets are bonded, the conductive paste may be filled.

  Further, in the above-described embodiment, the case where the flat cable is substantially linear is shown. However, if the bending angle of the center line in the width direction of the signal line conductor is an angle that does not change the transmission mode of the high-frequency signal to be transmitted. Good. For example, it may be 45 ° or less, and these can be appropriately set from the allowable range of transmission loss.

1-Flat cable 1A-Wide part 1B-Narrow part (line details)
10-first ground conductor 11-opening 20-second ground conductor 21-long conductor 20A-opening 22-long conductor 23-bridge conductor 30-signal line conductor 31-wide portion 32-narrow portion 41, 42,45-via conductor (interlayer connection conductor)
51-first base sheet 52-second base sheet 60-connector cable 61-coaxial connector 70-portable electronic device

Claims (11)

A substrate;
A signal line conductor provided on the substrate;
A ground conductor disposed opposite to the signal line conductor via the base material and having a plurality of openings along a direction in which the signal line conductor extends;
With
The base material and the ground conductor each have a wide part and a narrow part having substantially the same shape along the extending direction of the signal line conductor,
An interlayer connection conductor provided on the base material and connected to the ground conductor;
The interlayer connection conductor is formed in the wide portion of the base material and is not formed in the narrow portion of the base material.
High frequency line. The bending angle of the center line in the width direction in the signal line conductor is an angle at which the transmission mode of the high-frequency signal to be transmitted does not change.
The high frequency track according to claim 1. The signal line conductor has a narrow line portion in which the length in the width direction orthogonal to the direction in which the signal line conductor extends is narrower than the other region in the narrow portion of the base material,
The high-frequency line according to claim 1 or 2. Both end portions in the direction in which the signal line conductor extends of the thin wire portion,
The signal line conductor is inclined so that the length in the width direction gradually decreases from both ends in the direction in which the signal line conductor extends,
The high frequency track according to claim 3. The opening is provided at a position facing the thin line portion,
The length of the opening in the direction in which the signal line conductor extends is smaller than the length of the opening in the other region,
The high frequency track according to claim 3 or claim 4. From the thin line portion to the other region, the length in the width direction of the opening facing each position changes continuously or stepwise.
The high-frequency line according to claim 3. In the ground conductor, the length in the width direction of the opening formed in the narrow portion of the substrate is smaller than the length in the width direction of the opening formed in the wide portion of the substrate.
The high-frequency line according to claim 1. The total width of each of the ground conductor and the signal line conductor in the narrow portion of the base material is smaller than the total width of the ground conductor and the signal line conductor in the wide portion,
The high frequency line according to claim 1. A high-frequency line according to any one of claims 1 to 8,
A plurality of electronic components wired by the high-frequency line;
With electronic equipment. The signal line conductor has a narrow line portion in which the length in the width direction orthogonal to the direction in which the signal line conductor extends in the narrow portion of the base material is smaller than other regions,
A mounting component is disposed between the plurality of electronic components,
The mounting component is disposed in the vicinity of the thin wire portion,
The electronic device according to claim 9. The signal line conductor has a narrow line portion in which the length in the width direction orthogonal to the direction in which the signal line conductor extends in the narrow portion of the base material is smaller than other regions,
A member to which the plurality of electronic components can be connected is disposed between the plurality of electronic components by bending the high-frequency line.
The high-frequency line has the fine wire portion as a bent portion,
The electronic device according to claim 9.

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