WO2015022923A1 - アンテナ装置、カード型デバイスおよび電子機器 - Google Patents
アンテナ装置、カード型デバイスおよび電子機器 Download PDFInfo
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- WO2015022923A1 WO2015022923A1 PCT/JP2014/071146 JP2014071146W WO2015022923A1 WO 2015022923 A1 WO2015022923 A1 WO 2015022923A1 JP 2014071146 W JP2014071146 W JP 2014071146W WO 2015022923 A1 WO2015022923 A1 WO 2015022923A1
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- conductor pattern
- antenna
- antenna device
- conductor
- insulator
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- 239000004020 conductor Substances 0.000 claims abstract description 255
- 238000004804 winding Methods 0.000 claims abstract description 30
- 230000005484 gravity Effects 0.000 claims abstract description 12
- 239000012212 insulator Substances 0.000 claims description 52
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- 238000009413 insulation Methods 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 26
- 230000004907 flux Effects 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000003071 parasitic effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
- G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
- G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
- G06K19/07783—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
- G06K19/07784—Antenna details the antenna being of the inductive type the inductive antenna consisting of a plurality of coils stacked on top of one another
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/003—Printed circuit coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
- H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/0066—Printed inductances with a magnetic layer
Definitions
- the present invention relates to an antenna device used in an RFID (Radio Frequency Identification) system, a near field communication (NFC) system, and the like, a card type device including the antenna device, and an electronic device.
- RFID Radio Frequency Identification
- NFC near field communication
- Patent Document 1 is shown as an antenna device mounted on a wireless communication device applied to an RFID system or the like.
- Japanese Patent Application Laid-Open No. 2004-228561 controls antenna directivity by inserting a magnetic material into an opening of an antenna coil formed on the same plane of a flexible substrate.
- Patent Document 1 when increasing the number of turns, if the number of turns is increased toward the inside of the winding (winding center), the area of the coil opening is reduced, so that the magnetic flux passing through the coil opening is limited. Therefore, there is a problem that communication characteristics deteriorate. On the other hand, if the number of turns is increased toward the outside of the winding while the area of the coil opening is maintained, the outer shape of the antenna coil becomes large.
- the antenna device of the present invention is an antenna device in which a plurality of insulators each having a conductor pattern formed thereon are laminated, and an antenna coil having a plurality of turns is formed by the conductor pattern in the laminate.
- the antenna coil includes a first conductor pattern that forms a first side every turn, a second conductor pattern that forms a second side, and a third conductor that forms a third side, as viewed from the stacking direction of the insulator.
- a pattern, and a fourth conductor pattern forming a fourth side;
- the first conductor pattern is formed on the first layer
- the second conductor pattern is formed on a second layer different from the first layer
- the third conductor pattern and the fourth conductor pattern are formed from the first layer to the second layer.
- the first to fourth conductor patterns are formed on each insulator so that the direction of the line connecting the center of gravity of the wound shape of the conductor pattern for one turn is inclined with respect to the stacking direction of the insulators. It is characterized by being
- the number of turns can be increased without narrowing the substantial coil opening while suppressing an increase in the outer size of the antenna coil.
- the conductor pattern for one turn is preferably substantially the same in size and shape. As a result, an effective area as an antenna coil per occupied area can be increased.
- the third conductor pattern and the fourth conductor pattern are formed in different layers for each winding and overlap in the stacking direction of the insulator.
- the occupied area of the third conductor pattern and the fourth conductor pattern in a plan view can be suppressed, and the number of turns of the antenna coil can be increased while securing the coil opening.
- the formation ranges of the plurality of first conductor patterns and the formation ranges of the plurality of second conductor patterns may partially overlap. Thereby, the occupation area per turn number of the antenna coil can be reduced.
- the first conductor pattern and the second conductor pattern are parallel when viewed in the stacking direction of the insulator.
- the conductor pattern is simplified, and an antenna coil having a predetermined number of turns can be formed in a limited area.
- the first conductor pattern and the second conductor pattern may be non-parallel when viewed in the stacking direction of the insulator. Thereby, the shape of a coil opening can be diversified.
- the first conductor pattern and the second conductor pattern are larger in line width than the third conductor pattern and the fourth conductor pattern (or the third conductor pattern and the fourth conductor pattern are the first conductor pattern and the second conductor pattern, respectively).
- the line width is preferably smaller than that of the two-conductor pattern).
- the card type device of the present invention is characterized in that the antenna device having any one of the above configurations is provided in a card type package.
- the electronic apparatus is characterized in that a circuit board is provided in a casing, and the antenna device having any one of the above-described configurations is mounted on the circuit board.
- the number of turns can be earned without narrowing the substantial coil opening. Therefore, it is possible to obtain a high-gain antenna device having a predetermined inductance while being small, and a card-type device and electronic equipment including the antenna device.
- FIG. 1 is a perspective view of an antenna device 101 according to the first embodiment.
- FIG. 2 is an exploded perspective view of the antenna device 101.
- 3A is a cross-sectional view taken along the line AA in FIG. 1
- FIG. 3B is a cross-sectional view taken along the line BB in FIG. 4A
- FIG. 4B is the antenna coil.
- It is a top view which shows the coil winding axis
- FIG. 5 is a diagram showing the parasitic capacitance generated in each part of the antenna coil in the antenna device 101.
- FIG. 6A is a perspective view of the antenna device 101 of the present embodiment
- FIG. 6B is a perspective view of the antenna device of Comparative Example 1
- FIG. 6C is a perspective view of the antenna device of Comparative Example 2.
- FIG. 7 is a diagram showing a positional relationship between the antenna device 101 and the reader / writer side antenna 200.
- FIG. 8 is a diagram showing a change in the coupling coefficient with respect to the offset of each antenna apparatus shown in FIG.
- FIG. 9A is a plan view of the antenna device 102A
- FIG. 9B is a cross-sectional view thereof.
- 10A is a plan view of the antenna device 102B
- FIG. 10B is a cross-sectional view thereof.
- FIG. 11 is a plan view of the antenna device 103A.
- FIG. 12 is a plan view of the antenna device 103B.
- FIG. 13A is a plan view of the antenna device 104 of the fourth embodiment, and
- FIG. 13B is a plan view of the antenna device of the comparative example.
- FIG. 14 is a plan view of an insulator in which conductor patterns 10, 20, 30, and 40 are formed in the multilayer body.
- FIG. 15 is a perspective view of the antenna device 106 according to the sixth embodiment.
- FIG. 16 is a cross-sectional view of a main part of an electronic device 301 according to the seventh embodiment.
- FIG. 17 is a plan view of the metal socket 410 with the card-type device 401 of the eighth embodiment inserted.
- FIG. 18 is a cross-sectional view of the main part of an electronic device provided with a metal socket 410.
- FIG. 1 is a perspective view of an antenna device 101 according to the first embodiment.
- a plurality of insulators on which conductor patterns are formed are laminated, and a first conductor pattern 10, a second conductor pattern 20, a third conductor pattern 30, and a fourth conductor pattern 40 are formed in the laminate 90.
- a multi-turn antenna coil Is a multi-turn antenna coil.
- FIG. 1 is a perspective view of the inside of the laminate.
- the first conductor pattern, the second conductor pattern, the linear conductor of the third conductor pattern, and the linear conductor of the fourth conductor pattern are formed on the lower surface of the predetermined insulator among the insulators S1 to S10. These linear conductors are hereinafter simply referred to as conductor patterns. Further, via conductors 31V, 32Va, 32Vb, 33Va, 33Vb, 34Va, 34Vb, 35V of the third conductor pattern and via conductors 41V, 42Va, 42Vb, 43Va of the fourth conductor pattern are provided at predetermined locations of the insulators S1 to S10. 43Vb, 44V, and 45V are formed, respectively.
- Input / output terminals 51 and 52 and mounting terminals 53 and 54 are formed on the lower surface of the insulator S1.
- Conductor patterns 11, 12, 13, 14, 15, 35, and 44 are formed on the insulator S2.
- a conductor pattern 34 is formed on the insulator S4.
- a conductor pattern 43 is formed on the insulator S5.
- a conductor pattern 33 is formed on the insulator S6.
- a conductor pattern 42 is formed on the insulator S7.
- a conductor pattern 32 is formed on the insulator S8.
- Conductor patterns 21, 22, 23, 24, 25, 31, 41 are formed on the insulator S10.
- the antenna coil of about 5 turns is constituted by the first conductor pattern, the second conductor pattern, the third conductor pattern, and the fourth conductor pattern.
- the conductor pattern for each turn has substantially the same size and shape.
- a nonmagnetic material layer may be further laminated on the insulators S1 and S10 in order to increase the mechanical strength.
- the thicknesses of the insulators S1 to S10 are as follows.
- the pitch in the layer direction of the conductor patterns 31, 32, 33, 34, 35 is constant at 75 ⁇ m.
- the pitch in the layer direction of the conductor patterns 41, 42, 43, 44 is 100 ⁇ m and constant.
- FIG. 4A is a cross-sectional view showing the magnetic flux passing through the antenna coil and the coil winding axis by the first conductor pattern, the second conductor pattern, the third conductor pattern, and the fourth conductor pattern
- FIG. 4B is the antenna. It is a top view which shows the coil winding axis
- FIG. 4A shows the cross-sectional view shown in FIG. 3B in which the magnetic flux ⁇ , the coil winding axis, and the like are entered. In FIG. 4A, the broken lines indicate the schematic shapes of the third conductor pattern and the fourth conductor pattern of the antenna coil.
- the antenna coil formed of the first conductor pattern, the second conductor pattern, the third conductor pattern, and the fourth conductor pattern has substantially the same shape and the same size as the conductor pattern for one turn. Then, the center of gravity of the winding shape by the conductor pattern for one turn (the center of gravity of the figure formed by closing the conductor pattern for one turn by connecting the start point and end point with a line segment) is connected for each adjacent turn.
- This line extends in a straight line. The direction of this line is inclined with respect to the stacking direction of the insulator. This line can be called the winding axis of the antenna coil.
- this line extends linearly.
- This line can be referred to as the winding axis of the antenna coil in the cross section.
- the point C1 is the center of gravity of the conductor pattern for one turn including the first conductor pattern 11 and the second conductor pattern 21.
- the point C2 is the center of gravity of the conductor pattern for one turn including the first conductor pattern 12 and the second conductor pattern 22
- the point C3 is for one turn including the first conductor pattern 13 and the second conductor pattern 23.
- the center of gravity of the conductor pattern, point C4 is the center of gravity of the conductor pattern for one turn including the first conductor pattern 14 and the second conductor pattern 24, and point C5 is one turn including the first conductor pattern 15 and the second conductor pattern 25. This is the center of gravity of the minute conductor pattern.
- a line connecting these centroids C1 to C5 extends linearly. This line can be called the winding axis of the antenna coil in a plane.
- the center of the plurality of turns (first turn, second turn, third turn,...) Is sequentially shifted in a predetermined direction (direction along the winding axis) when viewed in the stacking direction of the insulator.
- the first conductor pattern (11, 12, 13, 14, 15) and the second conductor pattern (21, 22, 23, 24, 25) of the plurality of turns are wound in the stacking direction of the insulator. They are sequentially displaced at predetermined intervals in the direction along the rotation axis.
- the first conductor pattern (11, 12, 13, 14, 15) and the second conductor pattern (21, 22, 23) of a plurality of turns When viewed from the direction orthogonal to the stacking direction of the insulators, as shown in FIG. 4, the first conductor pattern (11, 12, 13, 14, 15) and the second conductor pattern (21, 22, 23) of a plurality of turns.
- first conductor pattern 12 and the second conductor pattern 22 of the second turn are sequentially arranged adjacent to each other in a direction orthogonal to the stacking direction of the insulators. That is, the first conductor pattern 12 and the second conductor pattern 22 of the second turn are along the winding axis as viewed in the stacking direction of the insulator with respect to the first conductor pattern 11 and the second conductor pattern 21 of the first turn.
- the first conductor pattern 13 and the second conductor pattern 23 of the third turn are stacked with an insulator with respect to the first conductor pattern 12 and the second conductor pattern 22 of the second turn. As viewed in the direction, they are arranged at a predetermined interval in the direction along the winding axis.
- the magnetic flux passing through the coil opening of the antenna coil tilts in the direction of inclination of the winding axis and is linked to the antenna coil.
- the main direction through which the magnetic flux passes does not necessarily coincide with the direction along the winding axis, depending on the orientation of the antenna device in the magnetic field.
- FIG. 5 is a diagram showing the parasitic capacitance generated in each part of the antenna coil in the antenna device 101.
- the lines between the first conductor patterns 11, 12, 13, and 14 are equal, and the lines between the second conductor patterns 22, 23, 24, and 25 are equal.
- the interlayer distance of the fourth conductor patterns 41, 42, 43, 44 is equal to 100 ⁇ m.
- the interlayer distance between the linear conductors 31, 32, 33, 34, and 35 of the third conductor pattern shown in FIG. 2 is equal to 75 ⁇ m.
- first conductor pattern and the second conductor pattern are formed on the same plane (same layer), even if the width of the conductor pattern is increased, the parasitic capacitance is not easily increased.
- the insulating layer used in the laminate 90 may be a sintered body of magnetic material or non-magnetic material, or polyimide (PI) or liquid crystal polymer (LCP) in which a magnetic ferrite filler is dispersed.
- the resin sheet may be used.
- the material has a high Q value and a small magnetic loss.
- an antenna having a high antenna Q value can be configured.
- an electrode material having a low conductor loss such as Cu can be used.
- an antenna having a high antenna Q value can be configured.
- FIG. 6A is a perspective view of the antenna device 101 of the present embodiment
- FIG. 6B is a perspective view of the antenna device of Comparative Example 1
- FIG. 6C is a perspective view of the antenna device of Comparative Example 2.
- the antenna device of Comparative Example 1 includes a rectangular helical antenna coil whose coil winding axis faces the Y-axis direction
- the antenna device of Comparative Example 2 includes a rectangular spiral antenna coil whose coil winding axis faces the Z-axis direction.
- FIG. 7 is a diagram showing a positional relationship between the antenna device 101 and the reader / writer side antenna 200.
- the reader / writer side antenna 200 is a multi-turn loop antenna having a radius of 30 mm.
- the antenna device 101 or the like was placed at a position spaced apart from the center of the reader / writer side antenna 200 on the Z axis by a certain distance, and the coupling coefficient was measured when shifted from that position by dy in the Y axis direction.
- FIG. 8 shows the measurement results.
- the antenna device described above includes a laminate of a magnetic layer and a nonmagnetic layer, but may be a laminate of only a nonmagnetic layer or a laminate of only a magnetic layer. May be.
- the first conductor pattern and the second conductor pattern are formed in FIGS. 1 to 7 so that current flows along the longitudinal direction of each insulating layer.
- the third conductor pattern and the fourth conductor pattern are formed so that a current flows along the direction, but this is not restrictive.
- the first conductor pattern and the second conductor pattern are formed so that current flows along the short direction of each insulating layer, and the third conductor pattern and the fourth conductor so that current flows along the longitudinal direction of each insulating layer.
- a pattern may be formed.
- FIGS. 9 and 10 are diagrams showing the shapes of the antenna coils of the two antenna devices according to the second embodiment.
- FIG. 9A is a plan view of the antenna device 102A
- FIG. 9B is a cross-sectional view thereof.
- 10A is a plan view of the antenna device 102B
- FIG. 10B is a cross-sectional view thereof.
- the formation structure of the first conductor pattern 10 and the second conductor pattern 20 in the multilayer body is basically the same as that shown in the first embodiment, but is schematically shown in FIGS.
- the formation range of the plurality of first conductor patterns 10 and the formation range of the plurality of second conductor patterns 20 may partially overlap when viewed in the stacking direction of the insulators. Thereby, the occupation area per turn number of the antenna coil can be reduced.
- the direction in which the winding axis extends can be easily changed by adjusting the degree of overlap between the formation range of the first conductor pattern 10 and the formation range of the second conductor pattern 20, so that the direction in which the magnetic flux passes can be changed. Can be easily changed.
- FIG. 11 is a plan view of the antenna device 103A
- FIG. 12 is a plan view of the antenna device 103B.
- the first conductor pattern 10 and the second conductor pattern 20 of the antenna device 103A are non-parallel when viewed in the stacking direction of the insulator (in plan view).
- the first conductor pattern 10 of the antenna device 103B is non-linear when viewed in the stacking direction of the insulator (in plan view).
- the first conductor pattern 10 of the antenna device 103B has a portion that is not parallel (non-parallel) to the second conductor pattern 20, and is bent.
- the first conductor pattern 10 generally extends in a direction indicated by a straight broken line (a broken line connecting both ends with a straight line). Therefore, the first conductor pattern 10 and the second conductor pattern 20 are also the same for the antenna device 103B. It is non-parallel when viewed in the stacking direction of the insulator.
- the first conductor pattern 10 and the second conductor pattern 20 may be non-parallel when viewed in the stacking direction of the insulator.
- the path through which the magnetic flux passes bends as shown by the curved arrows in FIGS. 11 and 12, so that the shape of the coil opening can be diversified.
- the first conductor pattern 10 and the second conductor pattern 20 are arranged in a non-parallel state.
- the path through which the magnetic flux passes can be bent, and the magnetic flux can be designed to pass through a path that does not approach the peripheral components.
- unnecessary coupling with peripheral components can be suppressed.
- an antenna coil having a large effective size can be formed for a laminated body having a limited volume.
- the antenna device described above is an example in which the line extends linearly when the center of gravity of the winding shape of the conductor pattern for one turn is connected for each adjacent turn.
- Each conductor pattern may be formed so that when the center of gravity of the winding shape by the pattern is connected for each adjacent turn, the line has a shape along the curve.
- FIG. 13A is a plan view of the antenna device 104 of the fourth embodiment
- FIG. 13B is a plan view of the antenna device of the comparative example.
- the antenna device of this comparative example is the same as the antenna device 101 shown in the first embodiment.
- the first conductor pattern 10 and the second conductor pattern 20 have a larger line width than the third conductor pattern 30 and the fourth conductor pattern 40 (the third conductor pattern 30 and the fourth conductor pattern 30).
- the conductor pattern 40 has a smaller line width than the first conductor pattern 10 and the second conductor pattern 20).
- the width W of the coil opening becomes wide, the area of the coil opening can be secured while suppressing the DC resistance component DCR of the conductor pattern.
- the line length of the third conductor pattern 30 and the fourth conductor pattern 40 is shorter than that of the first conductor pattern 10 and the second conductor pattern 20, the direct current resistance by making the third conductor pattern 30 and the fourth conductor pattern 40 thinner.
- the increase in component DCR is suppressed.
- the opposing area of the 3rd conductor pattern 30 and the 4th conductor pattern 40 is suppressed, parasitic capacitance can be suppressed.
- FIG. 14 is a plan view of an insulator in which conductor patterns 10, 20, 30, and 40 are formed in the multilayer body.
- the second conductor pattern 20 has a larger line width and a smaller gap between the lines than the first conductor pattern 10. Therefore, compared with the formation range of a 2nd conductor pattern, a magnetic flux passes easily between the lines of the formation range of a 1st conductor pattern. Therefore, the directivity can be controlled not only by the inclination of the winding axis of the antenna coil but also by the ease with which the magnetic flux in the formation range of the first conductor pattern 10 and the second conductor pattern 20 can be removed. In addition, by determining the formation range according to not only the gap between the lines but also the line width, the easiness of the removal of the magnetic flux in the formation range of the first conductor pattern 10 and the second conductor pattern 20 is determined. You may control.
- FIG. 15 is a perspective view of the antenna device 106 according to the sixth embodiment.
- the basic structure of the laminate 90 is as shown in FIGS. 1 and 2 in the first embodiment.
- input / output terminals 51 and 52 and mounting terminals 53 to 60 are formed on the lower surface of the laminate 90.
- an insulator nonmagnetic layer
- electrodes 61 to 70 are transferred and formed on the surface.
- the electrodes 61 to 70 have the same shape as the input / output terminals 51 and 52 and the mounting terminals 53 to 60, and are formed at positions facing each other in the stacking direction.
- the terminal electrodes 61 to 70 are formed at the opposing positions of the input / output terminals 51 and 52 and the mounting terminals 53 to 60, the vertical symmetry of the stacked structure of the stacked body is high. Therefore, warpage due to a difference in shrinkage rate of each layer due to heating during formation of the laminate and mounting on the circuit board is suppressed, and flatness of the lower surface of the laminate is ensured. Thereby, surface mountability increases.
- FIG. 16 is a cross-sectional view of a main part of an electronic device 301 according to the seventh embodiment.
- the electronic device 301 is a portable tablet PC, for example, and FIG. 16 is a cross-sectional view of the electronic device 301 cut in the minor axis direction.
- the antenna device 101 is the antenna device shown in the first embodiment.
- the antenna device 101 is mounted near the edge of the long side of the circuit board 110.
- the circuit board 110 is provided in the housing 120.
- the magnetic flux passing through the antenna device 101 passes through the reader / writer side antenna 200, and both are magnetically coupled.
- FIG. 17 is a plan view of the metal socket 410 with the card-type device 401 of the eighth embodiment inserted.
- This card type device is, for example, a memory card such as an SD card or an authentication card such as a SIM card.
- An antenna device 101 is built in the card type device 401.
- the antenna device 101 is the antenna device shown in the first embodiment. In a state where the card-type device 401 is inserted into the metal socket 410, the antenna device 101 is arranged such that about half of the antenna coil (the first conductor pattern or the second conductor pattern) of the antenna device 101 comes out of the metal socket.
- the card type device 401 is arranged near the edge of the long side (along one short side).
- the card-type device If the antenna coil built in the card-type device has the shape shown in FIG. 6C (a rectangular spiral shape in which the coil winding axis faces the Z-axis direction), the card-type device is inserted into the card slot. When communicating with an external device, the magnetic flux is blocked by the metal socket 410 and communication is not possible. Further, assuming that the antenna coil built in the card-type device has the shape shown in FIG. 6B (a rectangular helical shape in which the coil winding axis faces the Y-axis direction), the normal direction of the main surface of the metal socket 410 Because it does not radiate, it is inconvenient. On the other hand, if the card-type device 401 incorporating the antenna device 101 shown in FIG. 17 is used, directivity is also obtained in the normal direction of the main surface of the metal socket 410 while reducing the influence of shielding by the metal socket 410. It can be secured.
- FIG. 6C a rectangular spiral shape in which the coil winding axis faces the Z-axis direction
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Abstract
Description
前記アンテナコイルは、前記絶縁体の積層方向から視て、1ターン毎に第1辺を形成する第1導体パターン、第2辺を形成する第2導体パターン、第3辺を形成する第3導体パターン、および第4辺を形成する第4導体パターンで構成され、
第1導体パターンは第1層に形成され、第2導体パターンは第1層とは異なる第2層に形成され、第3導体パターンおよび第4導体パターンは、第1層から第2層にかけて形成され、
前記第1~第4の導体パターンは、1ターン分の導体パターンによる巻回形状の重心を1ターン毎に結ぶ線の方向が前記絶縁体の積層方向に対して傾くように、各絶縁体に配置されることを特徴とする。
図1は第1の実施形態に係るアンテナ装置101の斜視図である。このアンテナ装置101は、導体パターンが形成された複数の絶縁体が積層されて、積層体90内に、第1導体パターン10、第2導体パターン20、第3導体パターン30、第4導体パターン40による複数ターンのアンテナコイルが構成されたものである。図1は積層体の内部を透視した図である。
12→32Va→32→32Vb→22→42Va→42→42Vbの経路、
13→33Va→33→33Vb→23→43Va→43→43Vbの経路、
14→34Va→34→34Vb→24→44V→44の経路、
で、それぞれ1ターン分のコイルが構成される。
S2:50μm
S3:25μm
S4:25μm
S5:50μm
S6:50μm
S7:25μm
S8:25μm
S9:50μm
S10:25μm
したがって、導体パターン31,32,33,34,35の層方向のピッチは75μmで一定である。また、導体パターン41,42,43,44の層方向のピッチはそれぞれ100μmで一定である。
第2の実施形態では、積層体内における第1導体パターンおよび第2導体パターンの別の配置について示す。図9、図10は第2の実施形態の2つのアンテナ装置のアンテナコイルの形状を示す図である。図9(A)はアンテナ装置102Aの平面図、図9(B)はその断面図である。図10(A)はアンテナ装置102Bの平面図、図10(B)はその断面図である。積層体内における第1導体パターン10および第2導体パターン20の形成構造は基本的に第1の実施形態で示したものと同じであるが、図9、図10では概略的に示している。
第3の実施形態では、積層体内における第1導体パターンおよび第2導体パターンの別の形状について示す。図11、図12は第3の実施形態の2つのアンテナ装置のアンテナコイルの形状を示す図である。図11はアンテナ装置103Aの平面図、図12はアンテナ装置103Bの平面図である。アンテナ装置103Aの第1導体パターン10と第2導体パターン20とは絶縁体の積層方向に視て(平面視で)非平行である。アンテナ装置103Bの第1導体パターン10は、絶縁体の積層方向に視て(平面視で)非直線状である。具体的には、アンテナ装置103Bの第1導体パターン10は、第2導体パターン20に対して平行でない(非平行である)部分を有し、屈曲する。第1導体パターン10は概略的には直線の破線(両端部を直線で結んだ破線)で示す方向に延びるので、このアンテナ装置103Bについても、第1導体パターン10と第2導体パターン20とは絶縁体の積層方向に視て非平行である。
第4の実施形態では、第3導体パターンおよび第4導体パターンの線幅について示す。
第5の実施形態では、第1導体パターンおよび第2導体パターンの線幅が互いに異なる例について示す。
図15は第6の実施形態のアンテナ装置106の斜視図である。このアンテナ装置106において積層体90の基本的な構造は、第1の実施形態で図1および図2に示したとおりである。但し、積層体90の下面に入出力端子51,52、実装用端子53~60が形成される。また、積層体90の上面には絶縁体(非磁性体層)がさらに積層され、その表面に電極61~70が転写形成される。電極61~70は入出力端子51,52および実装用端子53~60と同一形状であり、積層方向において互いに対向する位置に形成される。
図16は第7の実施形態である電子機器301の主要部の断面図である。この電子機器301は例えば携帯タブレットPC等であり、図16は電子機器301の短軸方向に切断した断面図である。アンテナ装置101は第1の実施形態で示したアンテナ装置である。このアンテナ装置101は回路基板110の長辺の縁付近に実装される。回路基板110は筐体120内に設けられる。アンテナ装置101を通る磁束は、リーダライター側アンテナ200を通って、両者は磁界結合する。
第8の実施形態ではカード型デバイスについて示す。
10(11,12,13,14,15)…第1導体パターン
20(21,22,23,24,25)…第2導体パターン
30…第3導体パターン
31,32,33,34,35…第3導体パターンの線状導体
31V,32Va,32Vb,33Va,33Vb,34Va,34Vb,35V…第3導体パターンのビア導体
40…第4導体パターン
41,42,43,44…第4導体パターンの線状導体
41V,42Va,42Vb,43Va,43Vb,44V,45V…第4導体パターンのビア導体
51V…ビア導体
51,52…入出力端子
53~60…実装用端子
61~70…電極
90…積層体
101,104,106…アンテナ装置
102A,102B,103A,103B…アンテナ装置
110…回路基板
120…筐体
200…リーダライター側アンテナ
301…電子機器
401…カード型デバイス
410…金属ソケット
Claims (9)
- 導体パターンが形成された複数の絶縁体が積層されて、積層体内に前記導体パターンによる複数ターンのアンテナコイルが構成されたアンテナ装置において、
前記アンテナコイルは、前記絶縁体の積層方向から視て、1ターン毎に第1辺を形成する第1導体パターン、第2辺を形成する第2導体パターン、第3辺を形成する第3導体パターン、および第4辺を形成する第4導体パターンで構成され、
第1導体パターンは第1層に形成され、第2導体パターンは第1層とは異なる第2層に形成され、第3導体パターンおよび第4導体パターンは、第1層から第2層にかけて形成され、
前記第1~第4の導体パターンは、1ターン分の導体パターンによる巻回形状の重心を1ターン毎に結ぶ線の方向が前記絶縁体の積層方向に対して傾くように、各絶縁体に配置される、アンテナ装置。 - 前記1ターン分の導体パターンは大きさおよび形状が実質的に同じである、請求項1に記載のアンテナ装置。
- 前記第3導体パターンおよび前記第4導体パターンは、巻回毎に異なる層に形成され、前記絶縁体の積層方向に視て重なる、請求項1または2に記載のアンテナ装置。
- 前記絶縁体の積層方向に視て、複数の前記第1導体パターンの形成範囲と複数の前記第2導体パターンの形成範囲とは部分的に重なる、請求項1~3のいずれかに記載のアンテナ装置。
- 前記絶縁体の積層方向に視て、前記第1導体パターンと前記第2導体パターンとは平行である、請求項1~4のいずれかに記載のアンテナ装置。
- 前記絶縁体の積層方向に視て、前記第1導体パターンと前記第2導体パターンとは非平行である、請求項1~4のいずれかに記載のアンテナ装置。
- 前記第1導体パターンおよび前記第2導体パターンは、前記第3導体パターンおよび前記第4導体パターンよりも線幅が大きい、請求項1~6のいずれかに記載のアンテナ装置。
- 請求項1~7のいずれかに記載のアンテナ装置をカード型のパッケージ内に設けたカード型デバイス。
- 筐体内に回路基板を備えた電子機器において、前記回路基板に請求項1~7のいずれかに記載のアンテナ装置が実装された電子機器。
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