WO2013099604A1 - 高周波信号線路及び電子機器 - Google Patents
高周波信号線路及び電子機器 Download PDFInfo
- Publication number
- WO2013099604A1 WO2013099604A1 PCT/JP2012/082193 JP2012082193W WO2013099604A1 WO 2013099604 A1 WO2013099604 A1 WO 2013099604A1 JP 2012082193 W JP2012082193 W JP 2012082193W WO 2013099604 A1 WO2013099604 A1 WO 2013099604A1
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- WIPO (PCT)
- Prior art keywords
- signal line
- ground conductor
- conductor
- frequency signal
- line
- Prior art date
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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
- H01P3/081—Microstriplines
- H01P3/082—Multilayer dielectric
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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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/025—Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance
- H05K1/0253—Impedance adaptations of transmission lines by special lay-out of power planes, e.g. providing openings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0224—Patterned shielding planes, ground planes or power planes
- H05K1/0225—Single or multiple openings in a shielding, ground or power plane
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09618—Via fence, i.e. one-dimensional array of vias
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09727—Varying width along a single conductor; Conductors or pads having different widths
Definitions
- the present invention relates to a high-frequency signal line and an electronic device, and more particularly to a high-frequency signal line and an electronic device in which a signal line is provided on a flexible element.
- the line width of the signal line is increased in order to reduce high-frequency transmission loss of the signal line. .
- This increases the surface area of the signal line and increases the area of the ground conductor portion facing the signal line.
- the high-frequency transmission loss is a loss mainly caused by a high-frequency signal changing to heat in a state where impedance matching is achieved.
- the line width of the signal line is increased, the area where the signal line and the ground conductor are opposed to each other is increased, and the capacitance generated between the signal line and the ground conductor is increased. Therefore, in order to make the characteristic impedance of the high-frequency signal line coincide with a predetermined characteristic impedance (for example, 50 ⁇ ), it is necessary to increase the distance between the signal line and the ground conductor and reduce the capacitance between them. is there. However, as the distance between the signal line and the ground conductor increases, the thickness of the high-frequency signal line increases.
- a predetermined characteristic impedance for example, 50 ⁇
- FIG. 12 is a plan view of the flexible substrate 600 described in Patent Document 1 from the stacking direction.
- the flexible substrate 600 includes a signal line 602 and a ground layer 604.
- the signal line 602 is a linear conductor.
- the ground layer 604 is stacked above the signal line 602 in the stacking direction via a dielectric layer. Although not shown, a ground layer is provided below the signal line 602 in the stacking direction.
- the ground layer 604 is provided with a plurality of openings 606.
- the openings 606 have a rectangular shape, and are arranged in a line on the signal line 602 in the direction in which the signal line 602 extends. Thereby, the signal line 602 partially overlaps the ground layer 604 when viewed from above in the stacking direction. As a result, the capacitance formed between the signal line 602 and the ground layer 604 is reduced. Therefore, the distance between the signal line 602 and the ground layer 604 can be reduced, and the flexible substrate 600 can be thinned.
- an object of the present invention is to provide a high-frequency signal line and an electronic device that can reduce the thickness of the high-frequency signal line.
- a high-frequency signal line includes an element body formed by laminating a plurality of insulator layers, a linear signal line provided in the element body, and the element body, A first ground conductor extending along a signal line; and the element body, the first ground conductor being provided on one side in a stacking direction with respect to the signal line and the first ground conductor, and along the signal line And arranged so as to intersect the signal line when viewed in plan from the stacking direction, so that the signal line and the first ground conductor are opposed to each other through the insulator layer.
- the size of the electrostatic capacitance is the signal line Said at least the magnitude of the capacitance formed between the floating conductors, characterized by.
- An electronic apparatus includes a housing and a high-frequency signal line housed in the housing, and the high-frequency signal line is configured by stacking a plurality of insulator layers.
- An element body, a linear signal line provided in the element body, a first ground conductor extending along the signal line in the element body, and the element body, Provided on one side in the stacking direction from the signal line and the first ground conductor, and are arranged along the signal line so as to intersect the signal line when viewed in plan from the stacking direction.
- a plurality of floating conductors, wherein the first The size of the capacitance formed between the ground conductor and the floating conductor is equal to or greater than the size of the capacitance formed between the signal line and the floating conductor.
- the high-frequency signal line can be thinned.
- FIG. 2 is an exploded view of a dielectric element body of the high-frequency signal line in FIG. 1.
- FIG. 2 is a cross-sectional structure diagram of the high-frequency signal line in FIG. 1. It is a cross-section figure of a high frequency signal track. It is the external appearance perspective view and sectional structure figure of the connector of a high frequency signal track
- 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 a cross-sectional structure diagram of the high-frequency signal transmission line 10 of FIG.
- FIG. 4 is a cross-sectional structure diagram of the high-frequency signal transmission line 10.
- FIG. 5 is an external perspective view and a cross-sectional structure diagram of the connector 100 b of the high-frequency signal transmission line 10. 1 to 5, the stacking direction of the high-frequency signal 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 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 16 (16a and 16b), signal lines 20, ground conductors 22 and 24, floating conductors 26, and via-hole conductors b1 and b2. , B1, B2 and connectors 100a, 100b.
- the dielectric body 12 extends in the x-axis direction when viewed in plan from the z-axis direction, and includes a line portion 12a and connection portions 12b and 12c.
- the dielectric body 12 is formed by laminating the protective layer 14 and the dielectric sheets (insulator layers) 18 (18a to 18c) shown in FIG. 2 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 direction side in the z-axis direction of the dielectric body 12 is referred to as a front surface (first main surface), and the main surface on the negative direction side in the z-axis direction of the dielectric body 12 is the back surface ( 2nd main 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 widths of the connecting portions 12b and 12c in the y-axis direction are wider than the width of the line portion 12a in the y-axis direction.
- the dielectric sheet 18 extends in the x-axis direction when viewed in plan from the z-axis direction, and has the same shape as the dielectric body 12.
- the dielectric sheet 18 is made of a flexible thermoplastic resin such as polyimide or liquid crystal polymer.
- the thickness T1 of the dielectric sheet 18a is thicker than the thickness T2 of the dielectric sheet 18b.
- the thickness T1 is 50 to 300 ⁇ m.
- the thickness T1 is 150 ⁇ m.
- the thickness T2 is 10 to 100 ⁇ m. In the present embodiment, the thickness T2 is 50 ⁇ m.
- the main surface on the positive side in the z-axis direction of the dielectric sheet 18 is referred to as the front surface
- the main surface on the negative direction side in the z-axis direction of the dielectric sheet 18 is referred to as the back surface.
- the dielectric sheet 18a includes a line portion 18a-a and connection portions 18a-b and 18a-c.
- the dielectric sheet 18b includes a line portion 18b-a and connection 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 external terminal 16a is a rectangular conductor provided near the center of the surface of the connecting portion 18a-b, as shown in FIGS. As shown in FIGS. 1 and 2, the external terminal 16b is a rectangular conductor provided near the center of the surface of the connecting portion 18a-c.
- the external terminals 16a and 16b are made of a metal material having a small specific resistance mainly composed of silver or copper.
- the surfaces of the external terminals 16a and 16b are gold plated.
- the signal line 20 is a linear conductor provided in the dielectric body 12, and extends on the surface of the dielectric sheet 18b in the x-axis direction. Both ends of the signal line 20 overlap the external terminals 16a and 16b when viewed in plan from the z-axis direction.
- the signal line 20 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the ground conductor 24 (first ground conductor) is provided on the surface of the dielectric sheet 18b on which the signal line 20 is provided. Thereby, the ground conductor 24 is provided between the dielectric sheets 18a and 18b as shown in FIG. Further, as shown in FIG. 2, the ground conductor 24 has an x-axis along the signal line 20 on both sides of the signal line 20 in the y-axis direction when viewed from the z-axis direction in the dielectric body 12. Extends in the direction.
- the ground conductor 24 includes line portions 24a-1 and 24a-2 and terminal portions 24b and 24c.
- the line portion 24a-1 is provided on the surface of the line portion 18b-a and extends in the x-axis direction on the positive side of the signal line 20 in the y-axis direction.
- the line portion 24a-2 is provided on the surface of the line portion 18b-a and extends in the x-axis direction on the negative direction side of the signal line 20 in the y-axis direction.
- the terminal portion 24b is provided on the surface of the line portion 18b-b and forms a rectangular ring surrounding the external terminal 16a when viewed in plan from the z-axis direction.
- the terminal portion 24b is connected to the ends of the line portions 24a-1 and 24a-2 on the negative direction side in the x-axis direction.
- the terminal portion 24c is provided on the surface of the line portion 18b-c and has an annular rectangular shape surrounding the periphery of the external terminal 16b when viewed in plan from the z-axis direction.
- the terminal portion 24c is connected to the ends of the line portions 24a-1 and 24a-2 on the positive side in the x-axis direction.
- the ground conductor 24 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the ground conductor 22 (first ground conductor) is provided on the surface of the dielectric sheet 18a.
- the ground conductor 22 is provided on the positive side in the z-axis direction with respect to the signal line 20 and the ground conductor 24 and faces the signal line 20 and the ground conductor 24 via the dielectric sheet 18a.
- the 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 in the x-axis direction.
- the terminal portion 22b is provided on the surface of the line portion 18a-b, and forms a rectangular ring surrounding the external terminal 16a when viewed in plan from the z-axis direction.
- 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 line portion 18a-c and has an annular rectangular shape surrounding the periphery of the external terminal 16b when viewed in plan from the z-axis direction.
- 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 ground conductor 22 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the floating conductor 26 is provided on the negative side in the z-axis direction with respect to the signal line 20 and the ground conductor 24 in the dielectric body 12, and more specifically, the surface of the dielectric sheet 18c. Is provided. Thereby, the floating conductor 26 is provided between the dielectric sheets 18b and 18c, as shown in FIG.
- the floating conductor 26 extends in the y-axis direction, and is orthogonal to the signal line 20 when viewed in plan from the z-axis direction.
- the floating conductors 26 are periodically arranged at equal intervals in the x-axis direction along the signal line 20 on the surface of the dielectric sheet 18c.
- the interval between the plurality of floating conductors 26 is preferably less than or equal to half the wavelength of the high-frequency signal transmitted through the signal line 20.
- the floating conductor 26 is opposed to the signal line 20 and the line portions 24a-1 and 24a-2 with the dielectric sheet 18b interposed therebetween.
- the width W1 at both ends in the y-axis direction of the floating conductor 26 is wider than the width W2 of the portion other than both ends of the floating conductor 26. That is, the width W1 of the portion where the floating conductor 26 overlaps the line portions 24a-1 and 24a-2 is wider than the width W2 of the portion where the floating conductor 26 overlaps the signal line 20.
- the electrostatic capacitance C2 formed between the line portions 24a-1 and 24a-2 of the ground conductor 22 and the floating conductor 26 is static capacitance formed between the signal line 20 and the floating conductor 26. It has a size equal to or greater than the capacitance C1.
- the floating conductor 26 is not connected to the signal line 20 and the ground conductors 22 and 24, and is not connected to any of the other conductors. Therefore, the potential of the floating conductor 26 becomes a floating potential between the potential of the signal line 20 and the potentials of the ground conductors 22 and 24 (ground potential).
- the floating conductor 26 configured as described above is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the via-hole conductor b1 passes through the connecting portion 18a-b of the dielectric sheet 18a in the z-axis direction, and connects the external terminal 16a and 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 connection portion 18a-c of the dielectric sheet 18a in the z-axis direction, and connects the external terminal 16b and the end portion of the signal line 20 on the positive direction side in the x-axis direction. Thereby, the signal line 20 is connected between the external terminals 16a and 16b.
- the via-hole conductors b1 and b2 are made of a metal material having a small specific resistance mainly composed of silver or copper.
- the plurality of via-hole conductors B1 penetrate the line portion 18a-a of the dielectric sheet 18a in the z-axis direction, and are arranged in a line at equal intervals in the line portion 18a-a.
- the via-hole conductor B1 is provided closer to the positive direction side in the y-axis direction than the signal line 20 when viewed in plan from the z-axis direction.
- the via-hole conductor B1 connects the ground conductor 22 and the line portion 24a-1 of the ground conductor 24.
- the via-hole conductor B1 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the plurality of via-hole conductors B2 pass through the line portion 18a-a of the dielectric sheet 18a in the z-axis direction, and are arranged in a line at equal intervals in the line portion 18a-a.
- the via-hole conductor B2 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.
- the via-hole conductor B2 connects the ground conductor 22 and the line portion 24a-2 of the ground conductor 24.
- the via-hole conductor B2 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the distance between the signal line 20 and the ground conductor 24 and the ground conductor 22 in the z-axis direction is substantially equal to the thickness T1 of the dielectric sheet 18a as shown in FIG. 50 ⁇ m to 300 ⁇ m.
- the distance between the signal line 20 and the ground conductor 24 and the ground conductor 22 in the z-axis direction is 150 ⁇ m.
- the distance between the signal line 20 and the ground conductor 24 and the floating conductor 26 in the z-axis direction is substantially equal to the thickness T2 of the dielectric sheet 18b as shown in FIG. 4, and is, for example, 10 ⁇ m to 100 ⁇ m.
- the distance between the signal line 20, the ground conductor 24, the floating conductor 26, and the z-axis direction is 50 ⁇ m. That is, the distance between the signal line 20 and the ground conductor 24 and the ground conductor 22 in the z-axis direction is designed to be larger than the distance between the signal line 20 and the ground conductor 24 and the floating conductor 26 in the z-axis direction. .
- the protective layer 14 covers substantially the entire surface of the dielectric sheet 18a. Thereby, the protective layer 14 covers the ground conductor 22.
- the protective layer 14 is made of a flexible resin such as a resist material, for example.
- 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 substantially at 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 of the opening Ha in the y-axis direction.
- the opening Hc is a rectangular opening provided on the negative direction side of the opening Ha in the x-axis direction.
- the opening Hd is a rectangular opening provided on the negative direction side of the opening Ha in the y-axis direction.
- 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 substantially at 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 side of the opening He in the y-axis direction.
- the opening Hg is a rectangular opening provided on the positive direction side of the opening He in the x-axis direction.
- the opening Hh is a rectangular opening provided on the negative side of the opening He in the y-axis direction.
- the terminal portion 22c functions as an external terminal by being exposed to the outside through the openings Hf to Hh.
- the connectors 100a and 100b are mounted on the surfaces of the connecting portions 12b and 12c, respectively. Since the configurations of the connectors 100a and 100b are the same, the configuration of the connector 100b will be described below as an example.
- 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 body 102 has a shape in which a cylinder is connected to a rectangular plate, 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 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 surface of the connector body 102 on the negative side in the z-axis direction.
- the center conductor 108 is provided at the center of the cylinder 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 cylindrical inner peripheral surface 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 mounted on the surface of the connection portion 12c such that the external terminal 104 is connected to the external terminal 16b and the external terminal 106 is connected to the terminal portion 22c. Thereby, the signal line 20 is electrically connected to the central conductor 108.
- the ground conductors 22 and 24 are electrically connected to the external conductor 110.
- FIG. 6 is a plan view of the electronic device 200 using the high-frequency signal transmission line 10 from the y-axis direction and the z-axis direction.
- 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 housing 210 contains circuit boards 202a and 202b, receptacles 204a and 204b, and a battery pack 206.
- the circuit board 202a is provided with, for example, a transmission circuit or a reception circuit including an antenna.
- 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 (more precisely, the protective layer 14) is in contact with the battery pack 206.
- the surface of the dielectric body 12 and the battery pack 206 are fixed with an adhesive or the like.
- the surface of the dielectric body 12 is a main surface located on the ground conductor 22 side with respect to the signal line 20. Therefore, the solid ground conductor 22 is located between the signal line 20 and the battery pack 206.
- a dielectric sheet 18 made of a thermoplastic resin having a copper foil formed on the entire surface is prepared.
- the surface of the copper foil of the dielectric sheet 18 is smoothed by applying, for example, zinc plating for rust prevention.
- the thickness of the copper foil is 10 ⁇ m to 20 ⁇ m.
- the external terminal 16 and the ground conductor 22 shown in FIG. 2 are formed on the surface of the dielectric sheet 18a by a photolithography process. Specifically, a resist having the same shape as the external terminals 16 (16a, 16b) and the ground conductor 22 shown in FIG. 2 is printed on the copper foil of the dielectric sheet 18a. And 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. Thereby, the external terminal 16 and the ground conductor 22 as shown in FIG. 2 are formed on the surface of the dielectric sheet 18a.
- the signal line 20 and the ground conductor 24 shown in FIG. 2 are formed on the surface of the dielectric sheet 18b by a photolithography process. Further, the floating conductor 26 shown in FIG. 2 is formed on the surface of the dielectric sheet 18c by a photolithography process. Note that these photolithography processes are the same as the photolithography processes for forming the external terminals 16 and the ground conductors 22, and thus description thereof is omitted.
- a laser beam is irradiated from the back side to the position where the via-hole conductors b1, b2, B1, B2 of the dielectric sheet 18a are formed to form a through hole. Thereafter, the through-hole formed in the dielectric sheet 18a is filled with a conductive paste.
- the dielectric sheets 18a to 18c are stacked in this order from the positive direction side in the z-axis direction to the negative direction side. Then, by applying heat and pressure to the dielectric sheets 18a to 18c from the positive direction side and the negative direction side in the z-axis direction, the dielectric sheets 18a to 18c are softened to be crimped and integrated, and through holes
- the conductive paste filled in is solidified to form via-hole conductors b1, b2, B1, and B2 shown in FIG.
- Each dielectric sheet 18 may be integrated using an adhesive such as an epoxy resin instead of thermocompression bonding.
- the via-hole conductors b1, b2, B1, and B2 may be formed by forming a through hole after the dielectric sheet 18 is integrated, and filling the through hole with a conductive paste or forming a plating film. Good.
- the via-hole conductor includes not only a conductor in which the through hole is completely filled, but also a conductor in which the inner peripheral surface of the through hole is covered with a conductor without being completely filled with the conductor.
- a protective layer 14 is formed on the dielectric sheet 18a by applying a resin (resist) paste. Thereby, the high frequency signal track 10 shown in FIG. 1 is obtained.
- the high-frequency signal line 10 According to the high-frequency signal line 10 according to the present embodiment, it is possible to reduce the high-frequency transmission loss and reduce the thickness of the high-frequency signal line 10.
- the high-frequency signal line 10 By thinning the high-frequency signal line 10, the high-frequency signal line 10 is easily mechanically bent. In addition, resistance to bending is improved, and disconnection or the like hardly occurs even by bending. Therefore, the high-frequency signal line 10 that can be bent repeatedly is obtained.
- FIG. 7 is an equivalent circuit diagram of the high-frequency signal transmission line 10.
- the plurality of floating conductors 26 are provided in the dielectric element body 12 on the negative side in the z-axis direction with respect to the signal line 20 and the ground conductor 24, and are aligned along the signal line 20.
- the signal line 20 and the ground conductor 24 are opposed to each other through the dielectric sheet 18b.
- the floating conductor 26 is not connected to the signal line 20 and the ground conductor 24, and is kept at a floating potential between the potential of the signal line 20 and the potential of the ground conductor 24.
- the ground is formed in order to form the capacitance between the ground conductor and the signal line. It is necessary to place the conductors on the negative side in the z-axis direction with respect to the signal lines so as to face each other. However, if the ground conductor and the signal line face each other over a wide area, the capacitance between the ground conductor and the signal line becomes too large. Therefore, in order to suppress the capacitance between the ground conductor and the signal line to the capacitance Ct, the distance between the ground conductor and the signal line in the z-axis direction is set to z between the floating conductor, the signal line, and the ground conductor.
- the high-frequency signal line 10 it needs to be larger than the distance in the axial direction. That is, when the floating conductor 26 is not used, the high-frequency signal line becomes thick. As described above, the high-frequency signal transmission line 10 can be thinned by using the floating conductor 26. Further, when the thickness of the high-frequency signal line 10 is sufficiently thin, the line width of the signal line 20 can be widened to reduce the high-frequency transmission loss of the high-frequency signal line 10.
- the ground conductor 24 is provided on the same dielectric sheet 18 b as the signal line 20.
- the distance between the ground conductor 22 and the ground conductor 24 in the z-axis direction is shortened, and the lengths of the via-hole conductors B1 and B2 are shortened. Since the via-hole conductors B1 and B2 are less likely to be deformed than the dielectric sheet 18, the via-hole conductors B1 and B2 can be easily used by bending the high-frequency signal line 10 by being shortened.
- the high-frequency signal transmission line 10 it can be easily bent and used for the following reasons. More specifically, when the capacitance Ct is formed between the signal line and the ground conductor without using the floating conductor 26, the ground conductor is positioned on the negative side in the z-axis direction with respect to the signal line. There is a need. Here, as the ground conductor is separated from the signal line in the stacking direction, the compressive stress or tensile stress applied to the ground conductor increases when the high-frequency signal line is bent. That is, it becomes difficult to bend the high-frequency signal line.
- the ground conductor 24 is provided on the dielectric sheet 18 b on which the signal line 20 is provided by providing the floating conductor 26.
- the distance in the z-axis direction between the signal line 20 and the ground conductor 24 can be reduced.
- the signal line 20 and the ground conductor 24 do not overlap in plan view. Therefore, it becomes easy to bend and use the high frequency signal transmission line 10.
- the floating conductors 26 are not solid conductor layers but linear conductors extending in the y-axis direction, and are arranged at equal intervals in the x-axis direction. As a result, the high-frequency signal line 10 is further easily used by being bent at a portion where the floating conductor 26 is not provided.
- the high-frequency signal transmission line 10 can suppress the generation of unnecessary radiation as will be described below. More specifically, in the high-frequency signal line 10, the electrostatic capacitance C ⁇ b> 1 formed between the signal line 20 and the floating conductor 26 is an electrostatic capacitance formed between the ground conductor 24 and the floating conductor 26. Smaller than C2. As a result, the number of electric lines of force generated between the signal line 20 and the floating conductor 26 is smaller than the number of electric lines of force generated between the ground conductor 24 and the floating conductor 26. Therefore, noise radiated from the signal line 20 flows to the ground conductor 24 via the floating conductor 26 and is less likely to be radiated out of the high-frequency signal line 10 from the floating conductor 26. From the above, in the high-frequency signal transmission line 10, generation of unnecessary radiation is suppressed.
- the high-frequency signal transmission line 10 can suppress generation of unnecessary radiation for the following reasons. More specifically, in the high-frequency signal line in which the floating conductor 26 is not provided, the characteristic impedance of the signal line is substantially constant throughout. In this case, a standing wave having a relatively long wavelength is generated with nodes at both ends of the signal line where the characteristic impedance is high. The standing wave having a relatively long wavelength has a frequency lower than the frequency of the high-frequency signal transmitted through the signal line. For this reason, when a high-frequency signal is transmitted to the signal line, a standing wave having a relatively long wavelength is generated in the signal line due to the signal included in the high-frequency signal. As a result, unnecessary radiation is generated by the standing wave.
- the interval between the floating conductors 26 is set to half or less of the wavelength of the high-frequency signal transmitted through the signal line 20.
- the characteristic impedance of the signal line 20 at the position where the floating conductor 26 is provided is lower than the characteristic impedance of the signal line 20 at the position where the floating conductor 26 is not provided. Therefore, the position where the floating conductor 26 is provided becomes a node of the standing wave, and the position where the floating conductor 26 is not provided becomes the antinode of the standing wave. Therefore, when the interval between the floating conductors 26 is set to be half or less of the wavelength of the high frequency signal, the high frequency signal does not include a signal having a wavelength that generates a standing wave. As a result, in the high-frequency signal transmission line 10, generation of a stationary wave in the signal line 20 is suppressed, and generation of unnecessary radiation is suppressed.
- FIG. 8 is an exploded view of the dielectric element body of the high-frequency signal transmission line 10a according to the first modification.
- the difference between the high-frequency signal line 10a and the high-frequency signal line 10 is that the arrangement of the floating conductors 26 is different. More specifically, in the high-frequency signal transmission line 10, the floating conductors 26 are arranged so as to be arranged at equal intervals. On the other hand, in the high-frequency signal transmission line 10a, two floating conductors 26 arranged close to each other are periodically arranged so as to be arranged at equal intervals. Thereby, the characteristic impedance of the signal line 20 is relatively low in the region A2 where the two floating conductors 26 are provided, and the characteristic impedance of the signal line 20 is relatively low in the region A1 where the floating conductor 26 is not provided. To be high. As a result, the characteristic impedance of the signal line 20 varies periodically.
- FIG. 9 is an exploded view of the dielectric element body of the high-frequency signal transmission line 10b according to the second modification.
- the difference between the high-frequency signal line 10b and the high-frequency signal line 10 is that the shapes of the floating conductor 26 and the floating conductor 28 are different. More specifically, in the high-frequency signal transmission line 10, the floating conductor 26 is a linear conductor extending in the y-axis direction. On the other hand, in the high-frequency signal line 10b, the floating conductor 28 has a frame-like rectangle. The area of the portion where the floating conductor 28 overlaps the ground conductor 24 as described above is larger than the area of the portion where the floating conductor 26 of the high-frequency signal line 10 overlaps the ground conductor 24. Therefore, the capacitance C2 increases. As described above, the characteristic impedance of the signal line 20 may be adjusted by changing the shape of the floating conductor 28 and adjusting the size of the capacitance C2.
- FIG. 10 is an exploded view of the dielectric body of the high-frequency signal transmission line 10c according to the third modification.
- the difference between the high-frequency signal line 10 c and the high-frequency signal line 10 b is that the shapes of the floating conductor 28 and the floating conductor 29 are different. More specifically, in the high-frequency signal transmission line 10b, the floating conductor 28 has a frame-like rectangle. On the other hand, in the high-frequency signal line 10c, the floating conductor 29 is U-shaped. The area of the portion where the floating conductor 29 overlaps the signal line 20 as described above is smaller than the area of the portion where the floating conductor 28 overlaps the signal line 20. Accordingly, the capacitance C1 is reduced. As described above, the characteristic impedance of the signal line 20 may be adjusted by changing the shape of the floating conductor 29 and adjusting the size of the capacitance C1.
- FIG. 11 is an exploded view of the dielectric element body of the high-frequency signal transmission line 10d according to the fourth modification.
- the difference between the high-frequency signal line 10d and the high-frequency signal line 10 is the presence or absence of the ground conductor 24 and the presence or absence of the via-hole conductors B1 and B2. More specifically, the ground conductor 24 is not provided in the high-frequency signal transmission line 10d. Therefore, the ground conductor 22 is provided on the positive side in the z-axis direction with respect to the signal line 20 and faces the floating conductor 26 via the dielectric sheets 18a and 18b. Thereby, the signal line 20 is directly capacitively coupled to the ground conductor 22 and capacitively coupled via the ground conductor 22 and the floating conductor 26.
- the via-hole conductors B1 and B2 are not provided in the dielectric sheet 18a. Even with such a configuration, the equivalent circuit of the high-frequency signal line 10d is the equivalent circuit shown in FIG. At this time, unnecessary radiation can be reduced by designing the capacitance C2 between the floating conductor 26 and the ground conductor 22 and the capacitance C1 between the signal line 20 and the floating conductor 26 so that C1 ⁇ C2. Occurrence is suppressed.
- the high-frequency signal line 10d having the above-described configuration, similarly to the high-frequency signal line 10, it is possible to reduce the high-frequency transmission loss and to reduce the thickness of the high-frequency signal line 10d. Further, since the via-hole conductors B1 and B2 are not formed in the dielectric sheet 18a, it is further easy to bend and use the high-frequency signal line 10d.
- the high-frequency signal line according to the present invention is not limited to the high-frequency signal lines 10 and 10a to 10d according to the above embodiment, and can be changed within the scope of the gist thereof.
- the floating conductor 26 is arranged so as to be orthogonal to the signal line 20 in a plan view from the z-axis direction.
- the floating conductor 26 is not necessarily orthogonal. That is, the floating conductor 26 only needs to intersect the signal line 20 when viewed in plan from the z-axis direction.
- 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 high-frequency signal lines and electronic devices, and is particularly excellent in that the high-frequency signal line 10 can be thinned.
- B1, B2, b1, b2 Via-hole conductors 10, 10a to 10d High-frequency signal line 12 Dielectric body 18a to 18c Dielectric sheet 20 Signal lines 22, 24 Ground conductors 26, 28, 29 Floating conductor
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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、図1の高周波信号線路10の断面構造図である。図4は、高周波信号線路10の断面構造図である。図5は、高周波信号線路10のコネクタ100bの外観斜視図及び断面構造図である。図1ないし図5において、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2を参照しながら説明する。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。
本実施形態に係る高周波信号線路10によれば、高周波伝送ロスの低減を図ることができると共に、高周波信号線路10の薄型化を図ることができる。この高周波信号線路10の薄型化により、高周波信号線路10を機械的に曲げやすくなる。また、曲げに対する耐性も向上し、曲げによっても断線などが起こりにくくなる。したがって、繰り返し曲げることが可能な高周波信号線路10が得られる。
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8は、第1の変形例に係る高周波信号線路10aの誘電素体の分解図である。
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9は、第2の変形例に係る高周波信号線路10bの誘電素体の分解図である。
以下に第3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10は、第3の変形例に係る高周波信号線路10cの誘電素体の分解図である。
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11は、第4の変形例に係る高周波信号線路10dの誘電素体の分解図である。
本発明に係る高周波信号線路は、前記実施形態に係る高周波信号線路10,10a~10dに限らず、その要旨の範囲内において変更可能である。
10,10a~10d 高周波信号線路
12 誘電体素体
18a~18c 誘電体シート
20 信号線
22,24 グランド導体
26,28,29 浮遊導体
Claims (8)
- 複数の絶縁体層が積層されて構成されている素体と、
前記素体に設けられている線状の信号線と、
前記素体において、前記信号線に沿って延在している第1のグランド導体と、
前記素体において、前記信号線及び前記第1のグランド導体よりも積層方向の一方側に設けられ、かつ、該信号線に沿って並んでいると共に、積層方向から平面視したときに、該信号線と交差するように配置されていることによって該信号線及び該第1のグランド導体に前記絶縁体層を介して対向している複数の浮遊導体であって、該信号線及び該第1のグランド導体に接続されていない複数の浮遊導体と、
を備えており、
前記第1のグランド導体と前記浮遊導体との間に形成されている静電容量の大きさは、前記信号線と前記浮遊導体との間に形成されている静電容量の大きさ以上であること、
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、積層方向から平面視したときに、前記信号線の両側において該信号線に沿って延在していること、
を特徴とする請求項1に記載の高周波信号線路。 - 前記信号線及び前記第1のグランド導体よりも積層方向の他方側に設けられ、かつ、該信号線に前記絶縁体層を介して対向している第2のグランド導体を、
更に備えていること、
を特徴とする請求項1又は請求項2のいずれかに記載の高周波信号線路。 - 前記第1のグランド導体と前記第2のグランド導体とは、ビアホール導体を介して接続されていること、
を特徴とする請求項3に記載の高周波信号線路。 - 前記第1のグランド導体は、前記信号線が設けられている前記絶縁体層に設けられており、
前記信号線と前記第2のグランド導体との積層方向における距離は、前記信号線と前記浮遊導体との積層方向における距離よりも大きいこと、
を特徴とする請求項3又は請求項4のいずれかに記載の高周波信号線路。 - 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他方側に設けられ、かつ、該信号線に前記絶縁体層を介して対向していること、
を特徴とする請求項1に記載の高周波信号線路。 - 前記絶縁体層は、可撓性を有していること、
を特徴とする請求項1ないし請求項6のいずれかに記載の高周波信号線路。 - 筐体と、
前記筐体に収容されている高周波信号線路と、
を備えており、
前記高周波信号線路は、
複数の絶縁体層が積層されて構成されている素体と、
前記素体に設けられている線状の信号線と、
前記素体において、前記信号線に沿って延在している第1のグランド導体と、
前記素体において、前記信号線及び前記第1のグランド導体よりも積層方向の一方側に設けられ、かつ、該信号線に沿って並んでいると共に、積層方向から平面視したときに、該信号線と交差するように配置されていることによって該信号線及び該第1のグランド導体に前記絶縁体層を介して対向している複数の浮遊導体であって、該信号線及び該第1のグランド導体に接続されていない複数の浮遊導体と、
を備えており、
前記第1のグランド導体と前記浮遊導体との間に形成されている静電容量の大きさは、前記信号線と前記浮遊導体との間に形成されている静電容量の大きさ以上であること、
を特徴とする電子機器。
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CN201290000726.XU CN203968484U (zh) | 2011-12-29 | 2012-12-12 | 高频信号线路及电子设备 |
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JP2010187141A (ja) * | 2009-02-10 | 2010-08-26 | Okayama Prefecture Industrial Promotion Foundation | 疑似導波管型伝送線路及びそれを用いたアンテナ |
WO2011007660A1 (ja) * | 2009-07-13 | 2011-01-20 | 株式会社村田製作所 | 信号線路及び回路基板 |
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JP2010187141A (ja) * | 2009-02-10 | 2010-08-26 | Okayama Prefecture Industrial Promotion Foundation | 疑似導波管型伝送線路及びそれを用いたアンテナ |
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