WO2014069258A1 - 高周波信号線路及びその製造方法 - Google Patents
高周波信号線路及びその製造方法 Download PDFInfo
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- WO2014069258A1 WO2014069258A1 PCT/JP2013/078327 JP2013078327W WO2014069258A1 WO 2014069258 A1 WO2014069258 A1 WO 2014069258A1 JP 2013078327 W JP2013078327 W JP 2013078327W WO 2014069258 A1 WO2014069258 A1 WO 2014069258A1
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- WIPO (PCT)
- Prior art keywords
- signal line
- ground conductor
- frequency signal
- axis direction
- line
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
- H01B7/041—Flexible cables, conductors, or cords, e.g. trailing cables attached to mobile objects, e.g. portable tools, elevators, mining equipment, hoisting cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
- H01B7/0018—Strip or foil conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
- H01P3/085—Triplate lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0277—Details of the structure or mounting of specific components for a printed circuit board assembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
- Y10T156/1039—Surface deformation only of sandwich or lamina [e.g., embossed panels]
Definitions
- the present invention relates to a high-frequency signal line and a manufacturing method thereof, and more specifically to a high-frequency signal line used for transmission of a high-frequency signal and a manufacturing method thereof.
- the high-frequency signal line includes a dielectric element body, a signal line, and two ground conductors.
- the dielectric body is configured by laminating a plurality of dielectric sheets made of a flexible material, and extends linearly in a predetermined direction.
- the signal line is a linear conductor provided on the dielectric sheet.
- the two ground conductors are provided on the dielectric sheet and sandwich the signal line in the stacking direction. Thereby, the signal line and the two ground conductors form a stripline structure.
- the high-frequency signal line is used, for example, for connecting two circuit boards in an electronic device.
- the high-frequency signal line described in Patent Document 1 is used by being bent in an electronic device. Therefore, the dielectric element body of the high-frequency signal line has flexibility.
- the high-frequency signal line is flexible throughout, for example, a portion that is desired to extend linearly without being bent in the high-frequency signal line may be bent.
- the capacitance formed between the signal line and the ground conductor may be increased.
- the characteristic impedance of the curved portion in the high-frequency signal line is lower than the characteristic impedance before the curve. That is, in the high-frequency signal line described in Patent Document 1, the characteristic impedance may deviate from a predetermined characteristic impedance (for example, 50 ⁇ ).
- an object of the present invention is to suppress the characteristic impedance from deviating from a predetermined characteristic impedance in a flexible high-frequency signal line.
- a high-frequency signal line is provided with a linear dielectric element body formed by laminating a plurality of flexible dielectric layers, and the dielectric element body, And a linear signal line extending along the dielectric element body, and a first ground conductor provided on the dielectric element body and extending along the signal line.
- a first ground conductor having a first main surface and a second main surface facing each other in the stacking direction, and the second main surface of the first ground conductor includes: A streak-like protrusion extending along the signal line is formed.
- a method for manufacturing a high-frequency signal line the step of forming a linear signal line on a first dielectric layer, and the formation of a first ground conductor on the second dielectric layer.
- a step of forming a dielectric element body by laminating and pressing the first dielectric layer and the second dielectric layer so that the first ground conductor faces the signal line.
- the first ground conductor is projected so that a part of the first ground conductor projects toward the other side in the laminating direction in a cross section orthogonal to the signal line.
- a part of the conductor is curved, and protrudes toward the signal line, and a streak-like protrusion extending along the signal line is formed on the first ground conductor.
- the present invention it is possible to suppress the characteristic impedance from deviating from the predetermined characteristic impedance in the flexible high-frequency signal line.
- FIG. 2 is an exploded view of a dielectric element body of the high-frequency signal line in FIG. 1. It is a disassembled perspective view of the track part of a high frequency signal track.
- FIG. 3 is a cross-sectional structure diagram along AA in FIG. 2.
- FIG. 3 is a cross-sectional structure diagram along BB in FIG. 2.
- FIG. 3 is a cross-sectional structure view taken along a line CC in FIG. 2.
- FIG. 1 is an external perspective view of a high-frequency signal transmission line 10 according to an embodiment of the present invention.
- FIG. 2 is an exploded view of the dielectric body 12 of the high-frequency signal line 10 of FIG.
- FIG. 3 is an exploded perspective view of the line portion 12 a of the high-frequency signal line 10.
- FIG. 4 is a sectional structural view taken along line AA in FIG.
- FIG. 2 is a cross-sectional structural view taken along line BB in FIG. 6 is a cross-sectional structural view taken along the line CC of FIG.
- the stacking direction of the high-frequency signal transmission line 10 is defined as the z-axis direction.
- the longitudinal direction of the high-frequency signal transmission line 10 is defined as the x-axis direction, and the direction orthogonal to the x-axis direction and the z-axis direction is defined as the y-axis direction.
- the high-frequency signal line 10 is a flat cable used for connecting two high-frequency circuits in an electronic device such as a mobile phone. As shown in FIGS. 1 to 3, the high-frequency signal line 10 includes a dielectric body 12, external terminals 16a and 16b, a signal line 20, a reference ground conductor 22, an auxiliary ground conductor 24, insulating members 60a and 60b, and via-hole conductors. b1 to b4, B1 to B6 and connectors 100a and 100b are provided.
- the dielectric body 12 is a flexible plate-like member that has a linear shape extending in the x-axis direction when viewed in plan from the z-axis direction. Connection parts 12b and 12c are included. As shown in FIG. 2, the dielectric body 12 is formed by laminating a protective layer 14, dielectric sheets 18a to 18c, and a protective layer 15 in this order from the positive direction side to the negative direction side in the z-axis direction. It is a laminated body.
- the main surface on the positive side in the z-axis direction of the dielectric body 12 is referred to as the front surface
- the main surface on the negative direction side in the z-axis direction of the dielectric body 12 is referred to as the back surface.
- the line portion 12a extends in the x-axis direction.
- the connecting portions 12b and 12c are respectively connected to the negative end portion in the x-axis direction and the positive end portion in the x-axis direction of the line portion 12a, and have a rectangular shape.
- the width in the y-axis direction of the connection parts 12b and 12c is larger than the width in the y-axis direction of the line part 12a.
- the dielectric sheets 18a to 18c extend in the x-axis direction when viewed in plan from the z-axis direction, and have the same shape as the dielectric body 12.
- the dielectric sheets 18a to 18c are sheets made of flexible thermoplastic resin such as polyimide or liquid crystal polymer.
- the front surface the main surface on the positive side in the z-axis direction of the dielectric sheets 18a to 18c
- the main surface on the negative direction side in the z-axis direction of the dielectric sheets 18a to 18c is referred to as the back surface.
- the total of the thickness D1 of the dielectric sheet 18a and the thickness D2 of the dielectric sheet 18b is larger than the thickness D3 of the dielectric sheet 18c, as shown in FIGS.
- the total thickness D1 and thickness D2 is, for example, 50 ⁇ m to 300 ⁇ m.
- the sum of the thickness D1 and the thickness D2 is 150 ⁇ m.
- thickness D1 is 75 micrometers.
- the thickness D2 is 75 ⁇ m.
- the thickness D3 is, for example, 10 ⁇ m to 100 ⁇ m. In the present embodiment, the thickness D3 is 50 ⁇ m.
- the dielectric sheet 18a includes a line portion 18a-a and connecting portions 18a-b and 18a-c.
- the dielectric sheet 18b includes a line portion 18b-a and connecting portions 18b-b and 18b-c.
- the dielectric sheet 18c includes a line portion 18c-a and connection portions 18c-b and 18c-c.
- the line portions 18a-a, 18b-a, and 18c-a constitute the line portion 12a.
- the connecting portions 18a-b, 18b-b, and 18c-b constitute a connecting portion 12b.
- the connecting portions 18a-c, 18b-c, and 18c-c constitute a connecting portion 12c.
- the signal line 20 is a linear conductor that transmits a high-frequency signal and is provided in the dielectric body 12.
- the signal line 20 is a linear conductor that is formed on the back surface of the dielectric sheet 18 b and extends in the x-axis direction along the dielectric body 12.
- the end of the signal line 20 on the negative side in the x-axis direction is located at the center of the connection 18b-b as shown in FIG.
- the end of the signal line 20 on the positive side in the x-axis direction is located at the center of the connecting portion 18b-c.
- the signal line 20 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the signal line 20 is formed on the back surface of the dielectric sheet 18b means that the signal line 20 is formed by patterning a metal foil formed by plating on the back surface of the dielectric sheet 18b, This indicates that the signal line 20 is formed by patterning the metal foil attached to the surface of the dielectric sheet 18b.
- the surface roughness of the surface of the signal line 20 that is in contact with the dielectric sheet 18b is the surface roughness of the surface of the signal line 20 that is not in contact with the dielectric sheet 18b. It becomes larger than the surface roughness.
- the reference ground conductor 22 is provided on the positive side in the z-axis direction with respect to the signal line 20, and extends in the x-axis direction along the signal line 20. It is a conductor layer. More specifically, the reference ground conductor 22 is formed on the surface of the dielectric sheet 18a and faces the signal line 20 via the dielectric sheets 18a and 18b. The reference ground conductor 22 is not provided with an opening at a position overlapping the signal line 20.
- the main surface on the positive direction side in the z-axis direction of the reference ground conductor 22 is referred to as a front surface
- the main surface on the negative direction side in the z-axis direction of the reference ground conductor 22 is referred to as a back surface.
- the reference ground conductor 22 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the reference ground conductor 22 is formed on the surface of the dielectric sheet 18a. That is, the reference ground conductor 22 is formed by patterning a metal foil formed by plating on the surface of the dielectric sheet 18a. Alternatively, the reference ground conductor 22 is formed by patterning the metal foil attached to the surface of the dielectric sheet 18a. Further, since the surface of the reference ground conductor 22 is smoothed, the surface roughness of the surface (back surface) of the reference ground conductor 22 that is in contact with the dielectric sheet 18 a is the dielectric sheet 18 a of the reference ground conductor 22. It becomes larger than the surface roughness of the surface (surface) not in contact with the surface.
- the reference ground conductor 22 includes a line portion 22a and terminal portions 22b and 22c.
- the line portion 22a is provided on the surface of the line portion 18a-a and extends along the x-axis direction.
- the terminal portion 22b is provided on the surface of the line portion 18a-b and forms a rectangular ring.
- the terminal portion 22b is connected to the end portion on the negative direction side in the x-axis direction of the line portion 22a.
- the terminal portion 22c is provided on the surface of the connection portion 18a-c and forms a rectangular ring.
- the terminal portion 22c is connected to the end portion on the positive direction side in the x-axis direction of the line portion 22a.
- the auxiliary ground conductor 24 is a conductor layer that is provided on the negative side in the z-axis direction from the signal line 20 and extends in the x-axis direction along the signal line 20. . More specifically, the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18c and faces the signal line 20 via the dielectric sheet 18c.
- the auxiliary ground conductor 24 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18c means that the auxiliary ground conductor 24 is formed by patterning a metal foil formed by plating on the back surface of the dielectric sheet 18c.
- the auxiliary ground conductor 24 is formed by patterning a metal foil attached to the back surface of the dielectric sheet 18c. Further, since the surface of the auxiliary ground conductor 24 is smoothed, the surface roughness of the surface of the auxiliary ground conductor 24 that is in contact with the dielectric sheet 18 c is in contact with the dielectric sheet 18 c at the auxiliary ground conductor 24. It becomes larger than the surface roughness of the non-surface.
- the auxiliary ground conductor 24 is constituted by a line portion 24a and terminal portions 24b and 24c.
- the line portion 24a is provided on the back surface of the line portion 18c-a and extends along the x-axis direction.
- the terminal portion 24b is provided on the back surface of the line portion 18c-b and forms a rectangular ring.
- the terminal portion 24b is connected to the end portion on the negative direction side in the x-axis direction of the line portion 24a.
- the terminal portion 24c is provided on the back surface of the connection portion 18c-c and forms a rectangular ring.
- the terminal portion 24c is connected to the end portion on the positive direction side in the x-axis direction of the line portion 24a.
- the line portion 24a is provided with a plurality of openings 30 that are arranged along the x-axis direction and have a rectangular shape.
- the line portion 24a has a ladder shape.
- a portion of the auxiliary ground conductor 24 sandwiched between adjacent openings 30 is referred to as a bridge portion 60.
- the bridge part 60 extends in the y-axis direction.
- the plurality of openings 30 and the plurality of bridge portions 60 alternately overlap the signal lines 20 when viewed in plan from the z-axis direction.
- the signal line 20 crosses the center of the opening 30 and the bridge portion 60 in the y-axis direction in the x-axis direction.
- the reference ground conductor 22 is not provided with an opening, and the auxiliary ground conductor 24 is provided with an opening 30. Therefore, the area where the reference ground conductor 22 and the signal line 20 overlap is larger than the area where the auxiliary ground conductor 24 and the signal line 20 overlap.
- the external terminal 16a is a rectangular conductor formed in the center on the surface of the connecting portion 18a-b. Therefore, the external terminal 16a overlaps the end of the signal line 20 on the negative direction side in the x-axis direction when viewed in plan from the z-axis direction.
- the external terminal 16b is a rectangular conductor formed at the center on the surface of the connecting portion 18a-c. Therefore, the external terminal 16b overlaps the end portion of the signal line 20 on the positive direction side in the x-axis direction when viewed in plan from the z-axis direction.
- External terminals 16a and 16b are made of a metal material having a small specific resistance mainly composed of silver or copper. Further, Ni / Au plating is applied to the surfaces of the external terminals 16a and 16b. Here, the external terminals 16a and 16b are formed on the surface of the dielectric sheet 18a. The metal foil formed by plating on the surface of the dielectric sheet 18a is patterned to form the external terminals 16a and 16b. It indicates that the external terminals 16a and 16b are formed by patterning the metal foil attached to the surface of the dielectric sheet 18a.
- the surface roughness of the surface where the external terminals 16a and 16b are in contact with the dielectric sheet 18a is the same as that of the external terminals 16a and 16b. It becomes larger than the surface roughness of the non-contact surface.
- External terminals 16a and 16b, signal line 20, reference ground conductor 22 and auxiliary ground conductor 24 have substantially the same thickness.
- the thicknesses of the external terminals 16a and 16b, the signal line 20, the reference ground conductor 22, and the auxiliary ground conductor 24 are, for example, 10 ⁇ m to 20 ⁇ m.
- the signal line 20 is sandwiched between the reference ground conductor 22 and the auxiliary ground conductor 24 from both sides in the z-axis direction. That is, the signal line 20, the reference ground conductor 22, and the auxiliary ground conductor 24 have a triplate stripline structure.
- the distance between the signal line 20 and the reference ground conductor 22 is the sum of the thickness D1 of the dielectric sheet 18a and the thickness D2 of the dielectric sheet 18b as shown in FIGS. For example, 50 ⁇ m to 300 ⁇ m. In the present embodiment, the distance between the signal line 20 and the reference ground conductor 22 is 150 ⁇ m.
- the distance (distance in the z-axis direction) between the signal line 20 and the auxiliary ground conductor 24 is substantially equal to the thickness D3 of the dielectric sheet 18c as shown in FIGS. 4 and 5, for example, 10 ⁇ m to 100 ⁇ m. .
- the distance between the signal line 20 and the auxiliary ground conductor 24 is 50 ⁇ m. Therefore, the distance in the z-axis direction between the signal line 20 and the reference ground conductor 22 is larger than the distance in the z-axis direction between the signal line 20 and the auxiliary ground conductor 24.
- the plurality of via-hole conductors B1 pass through the dielectric sheet 18a in the z-axis direction on the positive side in the y-axis direction from the signal line 20, and are equally spaced in a line in the x-axis direction.
- the plurality of via-hole conductors B2 pass through the dielectric sheet 18b in the z-axis direction on the positive side in the y-axis direction from the signal line 20, and are equally spaced in a line in the x-axis direction.
- the plurality of via-hole conductors B3 pass through the dielectric sheet 18c in the z-axis direction on the positive side in the y-axis direction from the signal line 20, and are equally spaced in a line in the x-axis direction. Are lined up.
- the via hole conductors B1 to B3 are connected to each other to form one via hole conductor.
- the end of the via-hole conductor B1 on the positive side in the z-axis direction is connected to the reference ground conductor 22.
- the end of the via-hole conductor B3 on the negative side in the z-axis direction is connected to the auxiliary ground conductor 24.
- the via-hole conductor B3 is connected to the auxiliary ground conductor 24 on the positive side in the y-axis direction from the bridge portion 60.
- the via-hole conductors B1 to B3 are formed by filling the via holes formed in the dielectric sheets 18a to 18c with a conductive paste containing silver, tin, copper, or the like as a main component and solidifying.
- the plurality of via-hole conductors B4 pass through the dielectric sheet 18a in the z-axis direction on the negative side in the y-axis direction from the signal line 20, and are evenly spaced in a line in the x-axis direction. Are lined up.
- the plurality of via-hole conductors B5 pass through the dielectric sheet 18b in the z-axis direction on the negative side in the y-axis direction from the signal line 20, and are equally spaced in a line in the x-axis direction. Are lined up. As shown in FIG.
- the plurality of via-hole conductors B6 pass through the dielectric sheet 18c in the z-axis direction on the negative side in the y-axis direction from the signal line 20, and are evenly spaced in a line in the x-axis direction. Are lined up. Via-hole conductors B4 to B6 are connected to each other to form one via-hole conductor. The end of the via-hole conductor B4 on the positive side in the z-axis direction is connected to the reference ground conductor 22. The end of the via-hole conductor B6 on the negative side in the z-axis direction is connected to the auxiliary ground conductor 24.
- the via-hole conductor B6 is connected to the auxiliary ground conductor 24 on the negative direction side in the y-axis direction from the bridge portion 60.
- the via-hole conductors B4 to B6 are formed by filling the via holes formed in the dielectric sheets 18a to 18c with a conductive paste mainly composed of silver, tin, copper, or the like and solidifying the via holes.
- the via-hole conductor b1 passes through the connecting portions 18a-b of the dielectric sheet 18a in the z-axis direction.
- the via-hole conductor b3 penetrates the connecting portion 18b-b of the dielectric sheet 18b in the z-axis direction.
- Via-hole conductors b1 and b3 are connected to each other to form one via-hole conductor.
- the end of the via-hole conductor b1 on the positive side in the z-axis direction is connected to the external terminal 16a.
- the end of the via-hole conductor b3 on the negative direction side in the z-axis direction is connected to the end of the signal line 20 on the negative direction side in the x-axis direction.
- the via-hole conductor b2 passes through the connecting portions 18a-c of the dielectric sheet 18a in the z-axis direction.
- the via-hole conductor b4 passes through the connecting portion 18b-c of the dielectric sheet 18b in the z-axis direction.
- the via-hole conductors b2 and b4 are connected to each other to constitute one via-hole conductor.
- the end of the via-hole conductor b2 on the positive side in the z-axis direction is connected to the external terminal 16b.
- the end of the via-hole conductor b4 on the negative direction side in the z-axis direction is connected to the end of the signal line 20 on the positive direction side in the x-axis direction.
- the via-hole conductors b1 to b4 are formed by filling the via holes formed in the dielectric sheets 18a and 18b with a conductive paste mainly composed of silver, tin, copper, or the like and solidifying them.
- the protective layer 14 is an insulating film provided on the surface of the dielectric sheet 18a provided on the most positive side in the z-axis direction, and covers the substantially entire surface of the dielectric sheet 18a. It is. That is, the protective layer 14 is laminated on the positive side in the z-axis direction of the reference ground conductor 22 and covers the reference ground conductor 22.
- the protective layer 14 is made of, for example, a flexible resin such as a resist material.
- the protective layer 14 includes a line portion 14a and connecting portions 14b and 14c.
- the line portion 14a covers the line portion 22a by covering the entire surface of the line portion 18a-a.
- the connecting portion 14b is connected to the end portion on the negative side in the x-axis direction of the line portion 14a and covers the surface of the connecting portion 18a-b.
- openings Ha to Hd are provided in the connection portion 14b.
- the opening Ha is a rectangular opening provided in the center of the connection portion 14b.
- the external terminal 16a is exposed to the outside through the opening Ha.
- the opening Hb is a rectangular opening provided on the positive side in the y-axis direction with respect to the opening Ha.
- the opening Hc is a rectangular opening provided on the negative direction side in the x-axis direction from the opening Ha.
- the opening Hd is a rectangular opening provided on the negative side in the y-axis direction with respect to the opening Ha.
- the terminal portion 22b functions as an external terminal by being exposed to the outside through the openings Hb to Hd.
- the connecting portion 14c is connected to the end portion on the positive side in the x-axis direction of the line portion 14a and covers the surface of the connecting portion 18a-c.
- openings He to Hh are provided in the connection portion 14c.
- the opening He is a rectangular opening provided in the center of the connection portion 14c.
- the external terminal 16b is exposed to the outside through the opening He.
- the opening Hf is a rectangular opening provided on the positive direction side in the y-axis direction with respect to the opening He.
- the opening Hg is a rectangular opening provided closer to the positive direction side in the x-axis direction than the opening He.
- the opening Hh is a rectangular opening provided on the negative side in the y-axis direction with respect to the opening He.
- the terminal portion 22c functions as an external terminal by being exposed to the outside through the openings Hf to Hh.
- the protective layer 15 is an insulating film provided on the back surface of the dielectric sheet 18c provided on the most negative direction side in the z-axis direction, and is laminated on the negative direction side in the z-axis direction of the auxiliary ground conductor 24.
- the insulating film covers substantially the entire back surface of the dielectric sheet 18c. Thereby, the protective layer 15 covers the auxiliary ground conductor 24.
- the protective layer 15 is made of a flexible resin such as a resist material, for example.
- the line portion 12a of the high-frequency signal transmission line 10 is provided with a section E1 that is not to be bent during use and sections E2 and E3 that may be bent during use.
- the section E2 is provided on the negative direction side in the x-axis direction from the section E1
- the section E3 is provided on the positive direction side in the x-axis direction from the section E1.
- the reference ground conductor 22 in the section E1 is a cross section orthogonal to the signal line 20, as shown in FIGS. It has a wavy shape (cross section perpendicular to the x-axis direction).
- the reference ground conductor 22 in the sections E ⁇ b> 2 and E ⁇ b> 3 is not wavy in a cross section perpendicular to the signal line 20 (cross section perpendicular to the x-axis direction). This will be described in more detail below.
- a region that overlaps the signal line 20 in the z-axis direction in the cross section orthogonal to the x-axis direction is defined as a region A13.
- regions A11 and A12 are defined as regions that overlap the opening 30 and do not overlap the signal line 20 in the z-axis direction.
- the region A11 is located on the positive side in the y-axis direction from the region A13, and the region A12 is located on the negative direction side in the y-axis direction from the region A13.
- the regions A11 and A12 extend along the signal line 20 in the x-axis direction. Therefore, as shown in FIG. 4, the regions A ⁇ b> 11 and A ⁇ b> 12 exist in the cross section of the high frequency signal line 10 in the bridge portion 60 in the same manner as the cross section of the high frequency signal line 10 in the opening 30.
- a region on the positive direction side in the y-axis direction from the region A11 is defined as a region A14, and a region on the negative direction side in the y-axis direction from the region A12 is defined as a region A15. .
- a groove G1 is provided on the surface of the reference ground conductor 22 in the region A11.
- the groove G1 is a line-shaped groove extending in the x-axis direction along the signal line 20 on the surface of the reference ground conductor 22 in the region A11 of the section E1.
- a protrusion P1 is provided that protrudes to the negative side in the z-axis direction.
- the protrusion P1 is a line-shaped protrusion that extends in the x-axis direction along the signal line 20 on the back surface of the reference ground conductor 22 in the region A11 of the section E1.
- a part of the reference ground conductor 22 is curved so as to protrude toward the negative direction side in the z-axis direction in the cross section orthogonal to the x-axis direction, whereby the groove G1 is formed on the surface of the reference ground conductor 22. And a protrusion P1 is formed on the back surface of the reference ground conductor 22.
- the groove G1 and the protrusion P1 are provided on the positive direction side in the y-axis direction from the signal line 20 when viewed in plan from the z-axis direction, and do not overlap the signal line 20.
- the insulating member 60 a is embedded in the groove G ⁇ b> 1 and extends along the signal line 20 in the x-axis direction.
- the insulating member 60a is a member different from the protective layer 14, and is made of a material harder than the dielectric sheets 18a to 18c.
- the insulating member 60a is made of, for example, resin.
- a groove G ⁇ b> 2 is provided on the surface of the reference ground conductor 22 in the region A ⁇ b> 12.
- the groove G2 is a streak (linear) groove extending in the x-axis direction along the signal line 20 on the surface of the reference ground conductor 22 in the region A12 of the section E1.
- a protrusion P2 that protrudes in the negative z-axis direction is provided on the back surface of the reference ground conductor 22 in the region A12.
- the protrusion P2 is a line-shaped protrusion extending in the x-axis direction along the signal line 20 on the back surface of the reference ground conductor 22 in the area A12 of the section E1.
- a part of the reference ground conductor 22 is curved so as to protrude toward the negative direction side in the z-axis direction, so that the groove G2 is formed on the surface of the reference ground conductor 22.
- a protrusion P2 is formed on the back surface of the reference ground conductor 22.
- the groove G2 and the protrusion P2 are provided on the negative direction side in the y-axis direction with respect to the signal line 20 when viewed in plan from the z-axis direction, and do not overlap with the signal line 20.
- the insulating member 60 b is embedded in the groove G ⁇ b> 2 and extends in the x-axis direction along the signal line 20.
- the insulating member 60b is a member different from the protective layer 14 similarly to the insulating member 60a, and is made of a material harder than the dielectric sheets 18a to 18c.
- the insulating member 60b is made of, for example, resin.
- the characteristic impedance of the high-frequency signal transmission line 10 periodically varies between the impedance Z1 and the impedance Z2. More specifically, a relatively small capacitance is formed between the signal line 20 and the auxiliary ground conductor 24 in the section A1 that overlaps the opening 30 in the signal line 20. Therefore, the characteristic impedance of the high-frequency signal transmission line 10 in the section A1 is a relatively high impedance Z1.
- the characteristic impedance of the high-frequency signal transmission line 10 in the section A2 is a relatively low impedance Z2.
- the section A1 and the section A2 are alternately arranged in the x-axis direction. Therefore, the characteristic impedance of the signal line 20 of the high-frequency signal line 10 periodically varies between the impedance Z1 and the impedance Z2.
- the impedance Z1 is, for example, 55 ⁇
- the impedance Z2 is, for example, 45 ⁇ .
- the average characteristic impedance of the entire high-frequency signal line 10 is, for example, 50 ⁇ .
- FIG. 7 is an external perspective view of the connector 100 b of the high-frequency signal transmission line 10.
- FIG. 8 is a cross-sectional structure diagram of the connector 100 b of the high-frequency signal transmission line 10.
- the connector 100b includes a connector main body 102, external terminals 104 and 106, a central conductor 108, and an external conductor 110, as shown in FIGS.
- the connector main body 102 has a shape in which a cylindrical member is connected to a rectangular plate member, and is made of an insulating material such as a resin.
- the external terminal 104 is provided at a position facing the external terminal 16b on the negative side surface in the z-axis direction of the plate member of the connector main body 102.
- the external terminal 106 is provided at a position corresponding to the terminal portion 22c exposed through the openings Hf to Hh on the negative surface side in the z-axis direction of the plate member of the connector main body 102.
- the center conductor 108 is provided at the center of the cylindrical member of the connector main body 102 and is connected to the external terminal 104.
- the center conductor 108 is a signal terminal for inputting or outputting a high frequency signal.
- the external conductor 110 is provided on the inner peripheral surface of the cylindrical member of the connector main body 102 and is connected to the external terminal 106.
- the outer conductor 110 is a ground terminal that is maintained at a ground potential.
- the connector 100b configured as described above is connected to the external terminal 104 with the external terminal 16b and the external terminal 106 is connected to the terminal part 22c. Mounted on the surface. Thereby, the signal line 20 is electrically connected to the central conductor 108. Further, the reference ground conductor 22 and the auxiliary ground conductor 24 are electrically connected to the external conductor 110.
- FIG. 9 is a plan view of the electronic device 200 using the high-frequency signal transmission line 10 from the y-axis direction.
- FIG. 10 is a plan view of the electronic device 200 using the high-frequency signal transmission line 10 from the z-axis direction. Note that the lengths of the sections E1 to E3 in FIGS. 9 and 10 do not match the lengths of the sections E1 to E3 in FIGS. In FIG. 2 and FIG. 3, for the sake of simplicity, the section E1 is shown short.
- the electronic device 200 includes the high-frequency signal line 10, circuit boards 202 a and 202 b, receptacles 204 a and 204 b, a battery pack (metal body) 206, and a housing 210.
- the circuit board 202a is provided with a transmission circuit or a reception circuit including an antenna, for example.
- a power supply circuit is provided on the circuit board 202b.
- the battery pack 206 is a lithium ion secondary battery, for example, and has a structure in which the surface is covered with a metal cover.
- the circuit board 202a, the battery pack 206, and the circuit board 202b are arranged in this order from the negative direction side to the positive direction side in the x-axis direction.
- the receptacles 204a and 204b are provided on the main surfaces of the circuit boards 202a and 202b on the negative side in the z-axis direction, respectively.
- Connectors 100a and 100b are connected to receptacles 204a and 204b, respectively.
- a high frequency signal having a frequency of, for example, 2 GHz transmitted between the circuit boards 202a and 202b is applied to the central conductor 108 of the connectors 100a and 100b via the receptacles 204a and 204b.
- the external conductor 110 of the connectors 100a and 100b is kept at the ground potential via the circuit boards 202a and 202b and the receptacles 204a and 204b.
- the high-frequency signal transmission line 10 connects between the circuit boards 202a and 202b.
- the surface of the dielectric body 12 in the section E ⁇ b> 1 is in contact with the battery pack 206.
- the dielectric body 12 and the battery pack 206 are fixed with an adhesive or the like. Thereby, a solid reference ground conductor 22 having no opening exists between the signal line 20 and the battery pack 206.
- the dielectric body 12 in the sections E2 and E3 is bent along the corners of the battery pack 206.
- FIG. 11 to 14 are process cross-sectional views when the high-frequency signal transmission line 10 is crimped.
- a case where one high-frequency signal line 10 is manufactured will be described as an example, but actually, a plurality of high-frequency signal lines 10 are simultaneously manufactured by laminating and cutting large-sized dielectric sheets. .
- dielectric sheets 18a to 18c made of a thermoplastic resin in which a copper foil (metal film) is formed on the entire surface of one main surface are prepared. Specifically, a copper foil is attached to one main surface of the dielectric sheets 18a to 18c. Further, the surface of the copper foil of the dielectric sheets 18a to 18c is smoothed by, for example, applying a zinc plating for rust prevention.
- the dielectric sheets 18a to 18c are liquid crystal polymers.
- the thickness of the copper foil is 10 ⁇ m to 20 ⁇ m.
- the external terminals 16a and 16b and the reference ground conductor 22 are formed on the surface of the dielectric sheet 18a as shown in FIG. .
- a resist having the same shape as the external terminals 16a and 16b and the reference ground conductor 22 shown in FIG. 2 is printed on the copper foil on the surface of the dielectric sheet 18a.
- the copper foil of the part which is not covered with the resist is removed by performing an etching process with respect to copper foil. Thereafter, the resist is removed by spraying a cleaning liquid.
- the external terminals 16a and 16b and the reference ground conductor 22 as shown in FIG. 2 are formed on the surface of the dielectric sheet 18a by a photolithography process.
- the signal line 20 is formed on the back surface of the dielectric sheet 18b. Further, as shown in FIG. 2, the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18c.
- the process of forming the signal line 20 and the auxiliary ground conductor 24 is the same as the process of forming the external terminals 16a and 16b, the signal line 20 and the reference ground conductor 22, and thus the description thereof is omitted.
- through holes are formed by irradiating laser beams to positions where the via-hole conductors b1 to b4 and B1 to B6 of the dielectric sheets 18a to 18c are formed. Then, the through hole is filled with a conductive paste to form via-hole conductors b1 to b4 and B1 to B6.
- insulating members 60a and 60b are disposed on the surface of the dielectric sheet 18a in the regions A11 and A12 of the section E1. Further, the dielectric sheets 18a to 18c are laminated in this order from the positive direction side to the negative direction side in the z-axis direction so that the signal line 20 faces the reference ground conductor 22 and the auxiliary ground conductor 24.
- the reference ground conductor 22 is protruded toward the negative direction side in the z-axis direction in the cross section orthogonal to the x-axis direction.
- the reference ground conductor 22 is formed with streak-like (linear) grooves G1 and G2 and protrusions P1 and P2 extending along the signal line 20.
- a protective layer 14 covering the reference ground conductor 22 is formed on the surface of the dielectric sheet 18a by applying a resin (resist) paste by screen printing.
- a protective layer 15 covering the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18c by applying a resin (resist) paste by screen printing.
- a resin (resist) paste by screen printing.
- corrugation is not formed in the back surface of the protective layer 15.
- the dielectric body 12 is formed.
- the connectors 100a and 100b are mounted on the external terminals 16a and 16b on the connection parts 12b and 12c and the terminal parts 22b and 22c by using solder. Thereby, the high frequency signal track 10 shown in FIG. 1 is obtained.
- the reference ground conductor 22 in the areas A11 and A12 in the section E1 is on the negative direction side in the z-axis direction in the cross section orthogonal to the x-axis direction. It is curved to protrude toward Therefore, in the cross section orthogonal to the x-axis direction, the reference ground conductor 22 in the section E1 has a wavy shape.
- the cross-sectional secondary moment in the y-axis direction of the reference ground conductor 22 in the section E1 is greater than the cross-sectional secondary moment in the y-axis direction of the reference ground conductor 22 in the sections E2 and E3. growing.
- the high-frequency signal line 10 in the section E1 is less likely to bend than the high-frequency signal line 10 in the sections E2 and E3.
- the characteristic impedance of the high-frequency signal line 10 in the section E1 is suppressed from deviating from the predetermined characteristic impedance.
- insulating members 60a and 60b are provided in the section E1. Thereby, it is suppressed that the high frequency signal track
- the high-frequency signal line 10 in the section E1 is difficult to bend, the tensile stress applied to the signal line 20 in the section E1 is reduced. As a result, occurrence of disconnection in the signal line 20 is suppressed.
- the high-frequency signal transmission line 10 it is possible to reduce the thickness. More specifically, in the high-frequency signal transmission line 10, as shown in FIG. 2, in the section A1, the signal line 20 does not overlap with the auxiliary ground conductor 24 when viewed in plan from the z-axis direction. Therefore, it is difficult to form a capacitance between the signal line 20 and the auxiliary ground conductor 24. Therefore, even if the distance between the signal line 20 and the auxiliary ground conductor 24 in the z-axis direction is reduced, the capacitance formed between the signal line 20 and the auxiliary ground conductor 24 does not become too large. Therefore, the characteristic impedance of the signal line 20 is unlikely to deviate from a predetermined characteristic impedance (for example, 50 ⁇ ). As a result, according to the high-frequency signal transmission line 10, it is possible to reduce the thickness while maintaining the characteristic impedance of the signal line 20 at a predetermined characteristic impedance.
- a predetermined characteristic impedance for example, 50 ⁇
- the high-frequency signal line 10 when the high-frequency signal line 10 is attached to a metal body such as the battery pack 206, the characteristic impedance of the signal line 20 is suppressed from fluctuating. More specifically, the high-frequency signal line 10 is attached to the battery pack 206 so that the solid reference ground conductor 22 is located between the signal line 20 and the battery pack 206. As a result, the signal line 20 and the battery pack 206 do not face each other through the opening, and the formation of a capacity between the signal line 20 and the battery pack 206 is suppressed. As a result, the high-frequency signal line 10 is affixed to the battery pack 206, thereby suppressing the characteristic impedance of the signal line 20 from being lowered.
- insertion loss can be reduced. More specifically, when a current flows through the signal line 20, an electric force line is generated between the reference ground conductor 22 and the signal line 20.
- the electric field lines have a higher current density as the distance between the reference ground conductor 22 and the signal line 20 is smaller. Therefore, a region where current flows in the reference ground conductor 22 is narrowed, and current does not easily flow through the reference ground conductor 22.
- the protrusions P1 and P2 are provided on both sides of the signal line 20 in the y-axis direction when viewed in plan from the z-axis direction. As a result, a region that is substantially equidistant from the signal line 20 in the reference ground conductor 22 is widened. As a result, the current flows dispersedly over a wider area of the reference ground conductor 22, and the current easily flows through the signal line 20. As described above, the insertion loss in the high-frequency signal line 10 is reduced.
- FIG. 15 is a cross-sectional structure diagram of the bridge portion 60 of the line portion 12a of the high-frequency signal transmission line 10a according to the first modification.
- FIG. 16 is a cross-sectional structure diagram of the opening 30 of the line portion 12a of the high-frequency signal transmission line 10a according to the first modification.
- FIG. 1 is used for an external perspective view of the high-frequency signal transmission line 10a.
- the high-frequency signal line 10a is different from the high-frequency signal line 10 in that a dielectric sheet 18d is laminated on the positive side in the z-axis direction of the dielectric sheet 18a instead of the protective layer 14. Thereby, the reference ground conductor 22 is covered with the dielectric sheet 18d.
- insulating members 60a and 60b are attached to the back surface of the dielectric sheet 18d. Further, the dielectric sheets 18d, 18a to 18c are stacked in this order from the positive side in the z-axis direction to the negative side so that the signal line 20 faces the reference ground conductor 22 and the auxiliary ground conductor 24.
- the dielectric sheets 18d, 18a to 18c are subjected to a crimping process and a heating process from both sides in the z-axis direction by the crimping tools T1 and T2.
- the insulating members 60 a and 60 b are pressed against the surface of the reference ground conductor 22 when the pressure from the crimping tool T ⁇ b> 1 is transmitted through the dielectric sheet 18 d, and are recessed into the reference ground conductor 22.
- the insulating members 60a and 60b are embedded in the reference ground conductor 22, and the reference ground conductor 22 has a wavy shape in a cross section orthogonal to the x-axis direction.
- the high-frequency signal line 10a configured as described above and the method for manufacturing the same, it is possible to suppress the characteristic impedance from deviating from a predetermined characteristic impedance in the flexible high-frequency signal line 10a as with the high-frequency signal line 10.
- FIG. 19 is an exploded view of the dielectric body 12 of the high-frequency signal transmission line 10b according to the second modification.
- FIG. 20 is a cross-sectional structure diagram of the bridge portion 60 of the line portion 12a of the high-frequency signal transmission line 10b.
- FIG. 21 is a cross-sectional structure diagram in the opening 30 of the line portion 12a.
- FIG. 1 is used as an external perspective view of the high-frequency signal transmission line 10b.
- the high-frequency signal line 10b is different from the high-frequency signal line 10a in that the insulating members 60a and 60b are not provided as shown in FIGS. Therefore, in the high-frequency signal transmission line 10b, as shown in FIGS. 20 and 21, the protective layer 14 is filled in the grooves G1 and G2.
- the dielectric sheets 18a to 18c are moved from the positive side in the z-axis direction to the negative side so that the signal line 20, the reference ground conductor 22, and the auxiliary ground conductor 24 face each other. Laminate in this order.
- the dielectric sheets 18a to 18c are subjected to a crimping process and a heating process from both sides in the z-axis direction by the crimping tools T1 ′ and T2.
- the crimping tools T1 ′ and T2 will be described.
- the crimping tool T1 ′ is in contact with the surface of the dielectric sheet 18a and the surface of the reference ground conductor 22, as shown in FIGS.
- the contact surface of the crimping tool T1 ′ with respect to the surface of the dielectric sheet 18a and the surface of the reference ground conductor 22 is an uneven surface. More specifically, the contact surface of the crimping tool T1 ′ is provided with protrusions P11 and P12 that protrude toward the negative side in the z-axis direction and extend in the x-axis direction.
- the position where the protrusion P11 is provided corresponds to the position where the groove G1 is formed (that is, the region A11 of the section E1), and the position where the protrusion P12 is provided is the position where the groove G2 is formed ( This corresponds to the area A12) of the section E1.
- the crimping tool T2 is in contact with the back surface of the dielectric sheet 18c and the auxiliary ground conductor 24 as shown in FIGS.
- the contact surface of the crimping tool T2 with respect to the surface of the dielectric sheet 18a and the auxiliary ground conductor 24 is a flat surface.
- the above crimping tools T1 ′ and T2 have a built-in heater. Then, the dielectric sheets 18a to 18c are softened by performing heat treatment and pressure treatment on the dielectric sheets 18a to 18c by the crimping tools T1 ′ and T2. Thereby, as shown in FIGS. 13 and 14, the dielectric sheets 18a to 18c are joined. Further, the protrusions P11 and P12 are recessed with respect to the reference ground conductor 22. As a result, the reference ground conductor 22 has a wavy shape in a cross section orthogonal to the x-axis direction.
- the reference ground conductor 22 is embossed to form the line-shaped (linear) grooves G1, G2 and the protrusions P1, P2. Is forming.
- the high-frequency signal line 10b configured as described above and its manufacturing method, it is possible to suppress the characteristic impedance from deviating from a predetermined characteristic impedance in the flexible high-frequency signal line 10b, as with the high-frequency signal line 10.
- FIG. 26 is an exploded view of the high-frequency signal transmission line 10c according to the third modification.
- FIG. 1 is used for an external perspective view of the high-frequency signal transmission line 10c.
- the high-frequency signal line 10c is different from the high-frequency signal line 10b in that reinforcing ground conductors 40 and 42 are provided. More specifically, the reinforcing ground conductor 40 is formed on the back surface of the dielectric sheet 18b in the section E1, and extends in the x-axis direction. The reinforcing ground conductor 40 is provided on the positive side in the y-axis direction with respect to the signal line 20 when viewed in plan from the z-axis direction, does not overlap the opening 30 and the bridge portion 60, and is an auxiliary ground. It overlaps with the conductor 24. That is, the reinforcing ground conductor 40 does not overlap the region A11. Via hole conductors B2 and B3 are connected to the reinforcing ground conductor 40.
- the reinforcing ground conductor 42 is formed on the back surface of the dielectric sheet 18b in the section E1, and extends in the x-axis direction.
- the reinforcing ground conductor 42 is provided on the negative direction side in the y-axis direction with respect to the signal line 20 when viewed in plan from the z-axis direction, and does not overlap the opening 30 and the bridge portion 60. It overlaps with the conductor 24. That is, the reinforcing ground conductor 42 does not overlap the region A12. Via hole conductors B5 and B6 are connected to the reinforcing ground conductor 42.
- the proportion of the conductor in the region A11 overlapping the streak (linear) grooves G1 and G2 and the protrusions P1 and P2 in the z-axis direction is a streak (linear).
- the proportion of the conductor in the regions A13 to A15 that do not overlap with the protrusions P1 and P2 is smaller.
- FIG. 27 to 30 are process cross-sectional views when the high-frequency signal transmission line 10c is crimped.
- a case where one high-frequency signal line 10c is manufactured will be described as an example, but actually, a plurality of high-frequency signal lines 10c are simultaneously manufactured by laminating and cutting large-sized dielectric sheets. .
- the manufacturing method of the high frequency signal line 10c is different from the manufacturing method of the high frequency signal line 10 in the crimping process. Therefore, hereinafter, the crimping process will be described.
- the dielectric sheets 18a to 18c are moved from the positive side in the z-axis direction to the negative side so that the signal line 20, the reference ground conductor 22, and the auxiliary ground conductor 24 face each other. Laminate in this order.
- the dielectric sheets 18a to 18c are subjected to pressure bonding and heating from both sides in the z-axis direction by the pressure bonding tools T3 and T4 and the cushion material C1.
- the crimping tools T3 and T4 and the cushion material C1 will be described.
- the crimping tool T3 presses the surface of the dielectric sheet 18a and the surface of the reference ground conductor 22 through the cushion material C1.
- the contact surface of the crimping tool T3 with respect to the cushion material C1 is a flat surface.
- the cushion material C1 is a sheet made of an elastic body such as rubber.
- the crimping tool T4 presses the back surface of the dielectric sheet 18c and the auxiliary ground conductor 24.
- the contact surface of the crimping tool T4 with respect to the back surface of the dielectric sheet 18c and the auxiliary ground conductor 24 is a flat surface.
- the above crimping tools T3 and T4 have a built-in heater.
- the dielectric sheets 18a to 18c are softened.
- the proportion of the conductor in the region A11 overlapping the streak (linear) grooves G1 and G2 and the protrusions P1 and P2 in the z-axis direction is a streak (linear). Less than the proportion of the conductor in the regions A13 to A15 that do not overlap the protrusions P1 and P2. The conductor is more easily deformed than the dielectric sheets 18a to 18c.
- the reference ground conductor 22 in the regions A11 and A12 is more easily deformed than the reference ground conductor 22 in the regions A13 to A15.
- the cushion material C1 is deformed, and the reference ground conductor 22 has a waved shape in a cross section perpendicular to the x-axis direction. .
- the high-frequency signal line 10c configured as described above and the method for manufacturing the same, it is possible to suppress the characteristic impedance from deviating from a predetermined characteristic impedance in the flexible high-frequency signal line 10c as with the high-frequency signal line 10.
- FIG. 31 is a cross-sectional structure diagram in the opening 30 of the line portion 12a of the high-frequency signal transmission line 10d.
- FIG. 1 is used as an external perspective view of the high-frequency signal line 10d.
- the high frequency signal line 10d differs from the high frequency signal line 10 in the number of grooves G3 to G6 and protrusions P3 to P6. Insulating members 60c to 60f are embedded in the grooves G3 to G6.
- the high-frequency signal line 10d configured as described above, it is possible to suppress the characteristic impedance from deviating from a predetermined characteristic impedance in the flexible high-frequency signal line 10d, similarly to the high-frequency signal line 10.
- the high-frequency signal line and the manufacturing method thereof according to the present invention are not limited to the high-frequency signal lines 10, 10a to 10d and the manufacturing method thereof, and can be changed within the scope of the gist.
- the protective layers 14 and 15 are formed by screen printing, but may be formed by a photolithography process.
- the connectors 100a and 100b may not be mounted on the high-frequency signal lines 10, 10a to 10d. In this case, the ends of the high-frequency signal lines 10, 10a to 10c and the circuit board are connected by solder. Note that the connector 100a may be mounted only on one end of the high-frequency signal transmission lines 10 and 10a.
- the connectors 100a and 100b are mounted on the front surfaces of the high-frequency signal lines 10, 10a to 10d, but may be mounted on the back surfaces of the high-frequency signal lines 10, 10a to 10d. Further, the connector 100a may be mounted on the front surface of the high-frequency signal lines 10, 10a to 10d, and the connector 100b may be mounted on the back surface of the high-frequency signal lines 10, 10a to 10d.
- the high-frequency signal lines 10, 10a to 10d may be triplate type microstrip lines.
- a ground conductor extending along the signal line 20 may be provided on the back surface of the dielectric sheet 18b instead of the reference ground conductor 22 and the auxiliary ground conductor 24.
- the high-frequency signal lines 10 and 10a to 10d may be high-frequency signal lines having a coplanar structure.
- the grooves G1 and G2 and the protrusions P1 and P2 are provided on both sides in the y-axis direction of the signal line 20, but the groove is formed in at least one of the signal lines 20 in the y-axis direction.
- channel G2 or the protrusion P2 should just be provided.
- the reference ground conductor 22 may not be provided with the grooves G1, G2, but only the protrusions P1, P2.
- the cross-sectional secondary moment of the reference ground conductor 22 is larger than the cross-sectional secondary moment of the flat reference ground conductor where the protrusions P1 and P2 are not provided. Therefore, it is possible to suppress the characteristic impedance from deviating from the predetermined characteristic impedance in the flexible high-frequency signal line.
- a conductive member such as a metal may be used instead of the insulating members 60a to 60f.
- the high-frequency signal lines 10, 10a to 10d may be used as high-frequency signal lines in an RF circuit board such as an antenna front end module.
- the present invention is useful for a high-frequency signal line and a method for manufacturing the same, and particularly excellent in that the characteristic impedance can be prevented from deviating from a predetermined characteristic impedance in a flexible high-frequency signal line. .
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Abstract
Description
以下に、本発明の一実施形態に係る高周波信号線路の構成について図面を参照しながら説明する。図1は、本発明の一実施形態に係る高周波信号線路10の外観斜視図である。図2は、図1の高周波信号線路10の誘電体素体12の分解図である。図3は、高周波信号線路10の線路部12aの分解斜視図である。図4は、図2のA-Aにおける断面構造図である。図2は、図3のB-Bにおける断面構造図である。図6は、図2のC-Cにおける断面構造図である。以下では、高周波信号線路10の積層方向をz軸方向と定義する。また、高周波信号線路10の長手方向をx軸方向と定義し、x軸方向及びz軸方向に直交する方向をy軸方向と定義する。
以下に、高周波信号線路10の製造方法について図面を参照しながら説明する。図11ないし図14は、高周波信号線路10の圧着時の工程断面図である。以下では、一つの高周波信号線路10が作製される場合を例にとって説明するが、実際には、大判の誘電体シートが積層及びカットされることにより、同時に複数の高周波信号線路10が作製される。
以上のように構成された高周波信号線路10によれば、可撓性を有する高周波信号線路10において特性インピーダンスが所定の特性インピーダンスからずれることを抑制できる。より詳細には、高周波信号線路10では、図4及び図5に示すように、x軸方向に直交する断面において、区間E1の領域A11,A12における基準グランド導体22がz軸方向の負方向側に向かって突出するように湾曲している。そのため、x軸方向に直交する断面において、区間E1における基準グランド導体22が波打った形状をなすようになる。これにより、x軸方向に直交する断面において、区間E1における基準グランド導体22のy軸方向の断面二次モーメントが、区間E2,E3における基準グランド導体22のy軸方向の断面二次モーメントよりも大きくなる。その結果、区間E1における高周波信号線路10は、区間E2,E3における高周波信号線路10よりも湾曲しにくくなる。以上より、区間E1における高周波信号線路10が湾曲することによって、区間E1における高周波信号線路10の特性インピーダンスが所定の特性インピーダンスからずれることが抑制される。
以下に、第1の変形例に係る高周波信号線路について図面を参照しながら説明する。図15は、第1の変形例に係る高周波信号線路10aの線路部12aのブリッジ部60における断面構造図である。図16は、第1の変形例に係る高周波信号線路10aの線路部12aの開口30における断面構造図である。高周波信号線路10aの外観斜視図について図1を援用する。
以下に、第2の変形例に係る高周波信号線路について図面を参照しながら説明する。図19は、第2の変形例に係る高周波信号線路10bの誘電体素体12の分解図である。図20は、高周波信号線路10bの線路部12aのブリッジ部60における断面構造図である。図21は、線路部12aの開口30における断面構造図である。高周波信号線路10bの外観斜視図は図1を援用する。
以下に、第3の変形例に係る高周波信号線路10c及びその製造方法について図面を参照しながら説明する。図26は、第3の変形例に係る高周波信号線路10cの分解図である。高周波信号線路10cの外観斜視図については図1を援用する。
以下に、第4の変形例に係る高周波信号線路について図面を参照しながら説明する。図31は、高周波信号線路10dの線路部12aの開口30における断面構造図である。高周波信号線路10dの外観斜視図は図1を援用する。
本発明に係る高周波信号線路及びその製造方法は、高周波信号線路10,10a~10d及びその製造方法に限らず、その要旨の範囲内において変更可能である。
G1~G6 溝
P1~P6,P11,P12 突起
T1~T4 圧着ツール
10,10a~10d 高周波信号線路
12 誘電体素体
14 保護層
20 信号線
22 基準グランド導体
24 補助グランド導体
30 開口
40,42 補強グランド導体
60 ブリッジ部
60a~60f 絶縁部材
Claims (13)
- 可撓性を有する複数の誘電体層が積層されることにより構成されている線状の誘電体素体と、
前記誘電体素体に設けられ、かつ、該誘電体素体に沿って延在している線状の信号線と、
前記誘電体素体に設けられ、かつ、前記信号線に沿って延在している第1のグランド導体であって、積層方向に互いに対向する第1の主面及び第2の主面を有する第1のグランド導体と、
を備えており、
前記第1のグランド導体の前記第2の主面には、前記信号線に沿って延在する筋状の突起が形成されていること、
を特徴とする高周波信号線路。 - 前記第1のグランド導体は、前記信号線よりも積層方向の一方側に設けられ、かつ、該信号線と対向しており、
前記第1の主面は、積層方向の一方側の主面であり、
前記第2の主面は、積層方向の他方側の主面であり、
前記第2の主面には、前記信号線に沿って延在する筋状の突起が設けられていること、
を特徴とする請求項1に記載の高周波信号線路。 - 前記第2の主面に設けられている前記筋状の突起は、前記信号線に直交する断面において前記第1のグランド導体の一部が積層方向の他方側に向かって突出するように湾曲していることによって形成されていること、
を特徴とする請求項2に記載の高周波信号線路。 - 前記信号線に直交する断面において前記第1のグランド導体の一部が積層方向の他方側に向かって突出するように湾曲していることによって、前記第1の主面には筋状の溝が形成されており、
前記第1のグランド導体の積層方向の一方側には、絶縁体層が積層されており、
前記筋状の溝内には、前記絶縁体層とは異なる部材が埋め込まれていること、
を特徴とする請求項3に記載の高周波信号線路。 - 前記第2の主面に設けられている前記筋状の突起は、積層方向から平面視したときに、前記信号線よりも該信号線の線幅方向の少なくともいずれか一方に設けられていること、
を特徴とする請求項2ないし請求項4のいずれかに記載の高周波信号線路。 - 前記第2の主面に設けられている前記筋状の突起は、積層方向から平面視したときに、前記信号線に対して該信号線の線幅方向の両側に設けられていること、
を特徴とする請求項5に記載の高周波信号線路。 - 前記信号線に沿って延在しているグランド導体であって、該信号線よりも積層方向の他方側に設けられ、かつ、該信号線と対向する第2のグランド導体を、
を更に備えていること、
を特徴とする請求項2ないし請求項6のいずれかに記載の高周波信号線路。 - 前記誘電体素体の一部の区間において、前記第1の主面及び/又は前記第2の主面には、前記信号線に沿って延在する筋状の突起が形成されていること、
を特徴とする請求項1ないし請求項7のいずれかに記載の高周波信号線路。 - 第1の誘電体層上に線状の信号線を形成する工程と、
第2の誘電体層上に第1のグランド導体を形成する工程と、
前記第1のグランド導体が前記信号線と対向するように前記第1の誘電体層と前記第2の誘電体層とを積層及び圧着することによって、誘電体素体を形成する工程と、
を備えており、
前記積層及び圧着する工程では、前記信号線に直交する断面において前記第1のグランド導体の一部が積層方向の他方側に向けて突出するように該第1のグランド導体の一部を湾曲させて、該信号線に向かって突出し、かつ、該信号線に沿って延在する筋状の突起を該第1のグランド導体に形成すること、
を特徴とする高周波信号線路の製造方法。 - 前記信号線に直交する断面において、前記筋状の突起と積層方向に重なる領域に占める導体の割合は、該筋状の突起と積層方向に重ならない領域に占める導体の割合よりも少ないこと、
を特徴とする請求項9に記載の高周波信号線路の製造方法。 - 前記積層及び圧着する工程では、前記第1のグランド導体を弾性体で押圧することにより圧着処理を施すこと、
を特徴とする請求項10に記載の高周波信号線路の製造方法。 - 前記積層及び圧着する工程では、前記第1のグランド導体上に前記信号線に沿って延在する部材を配置した状態で圧着処理を施すこと、
を特徴とする請求項9又は請求項10のいずれかに記載の高周波信号線路の製造方法。 - 前記積層及び圧着する工程では、前記第1のグランド導体に型押しを行うことにより、前記筋状の突起を形成すること、
を特徴とする請求項9又は請求項10のいずれかに記載の高周波信号線路の製造方法。
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WO2017065094A1 (ja) * | 2015-10-13 | 2017-04-20 | 株式会社村田製作所 | 多層基板 |
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US20180288889A1 (en) * | 2017-03-30 | 2018-10-04 | Google Inc. | Circuit board and battery architecture of an electronic device |
JPWO2019131647A1 (ja) * | 2017-12-28 | 2020-10-22 | 株式会社村田製作所 | 基板接合構造 |
KR101938104B1 (ko) * | 2018-01-25 | 2019-01-14 | 주식회사 기가레인 | 접합 평탄도가 개선된 연성회로기판 |
JP6919731B2 (ja) * | 2018-01-30 | 2021-08-18 | 株式会社村田製作所 | 多層基板およびアンテナ素子 |
TWI815544B (zh) * | 2022-07-08 | 2023-09-11 | 美律實業股份有限公司 | 天線模組 |
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