WO2012017921A1 - Rfタグ、磁性体アンテナ及び当該rfタグを実装した基板、通信システム - Google Patents
Rfタグ、磁性体アンテナ及び当該rfタグを実装した基板、通信システム Download PDFInfo
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- WO2012017921A1 WO2012017921A1 PCT/JP2011/067319 JP2011067319W WO2012017921A1 WO 2012017921 A1 WO2012017921 A1 WO 2012017921A1 JP 2011067319 W JP2011067319 W JP 2011067319W WO 2012017921 A1 WO2012017921 A1 WO 2012017921A1
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- 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
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- G—PHYSICS
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- 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
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- G—PHYSICS
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- 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
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- 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
- G06K19/07781—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being fabricated in a winding process
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/045—Fixed inductances of the signal type with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
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- 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
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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
- 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
- H01Q7/08—Ferrite rod or like elongated core
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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
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/165—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed inductors
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/16—Inspection; Monitoring; Aligning
- H05K2203/162—Testing a finished product, e.g. heat cycle testing of solder joints
Definitions
- the present invention relates to a magnetic antenna and an RF tag for communicating information by using a magnetic field component, and the magnetic antenna and the RF tag have a magnetic sensitivity that improves communication sensitivity compared to the prior art.
- a body antenna and an RF tag are examples of body antenna and an RF tag.
- An antenna that transmits and receives electromagnetic waves using a magnetic material is a coil formed by winding a conducting wire around a core (magnetic material) and penetrating the magnetic material from the outside through the magnetic material.
- a loop coil whose plane is parallel to the object to be identified without using a magnetic material is used as an antenna, and when the frequency becomes higher (UHF band or microwave band), the RF tag.
- Electric field antennas dipole antennas and dielectric antennas that detect electric field components are widely used rather than detecting magnetic field components including.
- Such a loop antenna or electric field antenna has a problem that when a metal object approaches, an image (mirror effect) is formed on the metal object and has an opposite phase to the antenna, so that the sensitivity of the antenna is lost.
- a magnetic antenna for transmitting and receiving a magnetic field component, and an electrode material is formed in a coil shape on a core centering on the magnetic material, and an insulating layer is formed on one or both outer surfaces formed with the coiled electrode material
- Patent Document 1 A magnetic antenna in which a conductive layer is provided on one or both outer surfaces of the insulating layer is known (Patent Document 1). The magnetic antenna maintains its characteristics as an antenna even when in contact with a metal object.
- Patent Document 2 Japanese Patent Document 2
- JP 2007-19891 A Japanese Patent Laid-Open No. 9-64634 JP 2003-332822 A JP 2004-206479 A
- Patent Document 2 is intended to prevent a decrease in coil characteristics due to an increase in the resistance of the winding wire, and therefore does not describe anything about improving communication sensitivity.
- Patent Document 3 is intended to reduce stray capacitance (parasitic capacitance) to reduce variations in characteristics or inductance due to temperature change, and does not describe anything about improving communication sensitivity. Not.
- Patent Document 4 the purpose is to improve the communication sensitivity by increasing the area of the opening by bank winding, and there is no description about connecting a plurality of coils in parallel.
- an object of the present invention is to obtain a magnetic antenna capable of increasing the inductance of the coil limited by the resonance frequency more than ever and improving the communication sensitivity.
- the present invention is an RF tag mounted with IC in magnetic antenna for transmitting and receiving information using an electromagnetic induction method, the magnetic antenna to one of the magnetic core, the inductance L 1 is equation ( 1) A plurality of coils satisfying 1) are formed, and the winding method of each coil is a bank winding. The coils are connected in parallel on the electric circuit and arranged in series with the magnetic core.
- the RF tag is characterized in that the combined inductance L 0 satisfies the relational expression (2) (Invention 1).
- the present invention is a composite RF tag in which the RF tag according to the present invention 1 is coated with a resin (Invention 2).
- the present invention is a magnetic antenna for use in RF tag of the present invention 1, wherein, when magnetic material antenna is mounted with IC, inductance L 1 is relation to one of the magnetic core (1) A plurality of satisfying coils are formed, and each coil is wound in a bank winding. Each coil is connected in parallel on the electric circuit and arranged in series with the magnetic core, and the combined inductance L of the magnetic antenna A magnetic antenna characterized in that 0 satisfies the relational expression (2) (Invention 3).
- present invention is a substrate on which the RF tag according to the present invention 1 or the composite RF tag according to the present invention 2 is mounted (present invention 4).
- the present invention is a communication system using the RF tag according to the present invention 1 or the composite RF tag according to the present invention 2 (Invention 5).
- the magnetic antenna and the RF tag according to the present invention are magnetic antennas with improved sensitivity and can communicate over a long distance, and are suitable as a magnetic antenna for use in a 13.56 MHz RFID. is there.
- the magnetic antenna or RF tag according to the present invention has high communication sensitivity, it can be used for various applications such as various portable devices, containers, metal parts, substrates, metal tools, dies, and the like.
- FIG. 1 is a schematic view of a magnetic antenna according to the present invention.
- 1 is a perspective view of a magnetic antenna according to the present invention. It is the schematic which shows the state of bank winding. It is the schematic which shows the state of the core divided
- the magnetic antenna according to the present invention will be described.
- FIGS. 1 and 2 are schematic views of a magnetic antenna according to the present invention.
- the magnetic antenna (20) according to the present invention is centered on a core (3) made of a magnetic material, and an electrode material is coiled (wound) outside the core (3).
- the basic structure is that a plurality of coils (4-1) are electrically connected in parallel, and the coils (4-1) are arranged in series on the same core (3). To do. (In FIG. 1 and FIG. 2, there are four coils. However, in the present invention, the number of coils is not limited. In addition, the coils are illustrated by solenoid windings for simplification.)
- inductance L 1 of each coil (4-1) of the magnetic antenna is the relationship (1), it is impossible to improve the communication sensitivity.
- more preferably 3 times or more inductance L 1 of each coil is more than twice the combined inductance L 0 of the magnetic antenna.
- the resonance frequency of the RF tag on which the IC is mounted cannot be adjusted to the operating frequency, so that the communication sensitivity cannot be improved.
- each coil is formed by forming an electrode material in a coil shape (winding shape) on the outside of the core, and the winding method of the coil is bank winding.
- the parasitic capacitance does not increase even if the windings are wound in an overlapping manner, which contributes to an improvement in the sensitivity of the RF tag.
- FIG. 3-1 is a plan view (xy plane)
- FIG. 3-2 is a side view (yz plane).
- the positions of through holes are shown in order from an to n.
- FIG. 3A is a plan view, where a is the upper surface of the coil and a ′ is the lower surface of the coil. The same applies to the subsequent b, b ', c, and c', and the parenthesized portions are hidden portions.
- 3-2 is a side view, where b is the front side of the coil and (a) is the rear side of the coil. The same applies to the subsequent f, e, f ', and e', and the parenthesized portion is a hidden portion.
- coils are manufactured in the same order for portions not shown.
- the positional relationship between a ', a, b, b', c ', c, d, d', ... and e ', e, f, f', ... is not limited to FIG. , E ′, e, f, f ′,...
- the core in the present invention may have a structure in which the magnetic body constituting the core is divided by a non-magnetic body.
- the cross-sectional state cut perpendicularly to the magnetic flux penetrating the magnetic antenna shows that the magnetic material is a non-magnetic material.
- Any state may be used as long as it is divided, for example, the states shown in FIGS. 4 (a) to 4 (d).
- FIG. 5 is a schematic diagram showing another aspect of the magnetic antenna according to the present invention.
- the magnetic antenna (20) according to the present invention is centered on a core (3) made of a magnetic material.
- the electrode material is formed in a coil shape (winding shape) on the outside (2), a plurality of coils (4-1) are electrically connected in parallel, and the coil (4-1) has the same core ( 3), an insulating layer (6) is formed on one or both outer surfaces on which the coiled electrode material is formed, and a conductive layer (7) is formed on one or both outer surfaces of the insulating layer (6).
- FIG. 6 is a schematic diagram showing another aspect of the magnetic antenna according to the present invention.
- the coil is shown as a solenoid winding.
- the magnetic antenna (20) according to the present invention is centered on a core (3) made of a magnetic material.
- the electrode material is formed in a coil shape (winding shape) on the outside (2), a plurality of coils (4-1) are electrically connected in parallel, and the coil (4-1) has the same core ( 3), an insulating layer (6) is formed on one or both outer surfaces on which the coiled electrode material is formed, and a conductive layer (7) is formed on one or both outer surfaces of the insulating layer (6).
- a magnetic layer (5) may be provided outside the conductive layer (7).
- the magnetic antenna according to the present invention has capacitor electrodes (11) on one or both outer surfaces of the insulating layer (6) sandwiching the upper and lower surfaces of the coil (4). You may arrange.
- the capacitor formed on the upper surface of the insulating layer may be a capacitor formed by printing parallel electrodes or comb-shaped electrodes, and the capacitor and the coil lead terminal are further connected. You may connect in parallel or in series.
- an insulating layer (6) is further provided on the outer surface on which the capacitor electrode (11) is disposed, and an electrode layer serving also as an IC chip connection terminal on the outer surface of the insulating layer (6).
- a capacitor may be formed so as to form (9) and sandwich the insulating layer (6), and may be connected in parallel or in series with the IC chip connection terminal.
- a terminal (9) to which the IC chip (10) can be connected may be formed on the upper surface of the insulating layer (6).
- the IC chip connection terminal (9) and the coil lead terminal may be connected in parallel or in series and fired integrally.
- Ni—Zn ferrite or the like can be used as the magnetic material of the core.
- Ni—Zn ferrite Fe 2 O 3 45 to 49.5 mol%, NiO 9.0 to 45.0 mol%, ZnO 0.5 to 35.0 mol%, CuO 4.5 to A composition that is 15.0 mol% is preferable, and a ferrite composition that has high magnetic permeability as a material and low magnetic loss in the frequency band to be used may be selected. If a material with a magnetic permeability higher than necessary is used, the magnetic loss increases, making it unsuitable for an antenna.
- a ferrite composition such that the permeability at 13.56 MHz is 70 to 120 for the RFID tag application and the permeability at 10 MHz is 10 to 30 for the consumer FM broadcast reception because the magnetic loss is small.
- the magnetic antenna according to the present invention includes a nonmagnetic ferrite material such as Zn-based ferrite, a glass-based ceramic such as borosilicate glass, zinc-based glass, or lead-based glass, or nonmagnetic ferrite and glass-based material. What mixed a suitable quantity of ceramics etc. can be used.
- a Zn-based ferrite composition may be selected such that the volume resistivity of the sintered body is 10 8 ⁇ cm or more.
- a composition comprising Fe 2 O 3 45 to 49.5 mol%, ZnO 17.0 to 22.0 mol%, and CuO 4.5 to 15.0 mol% is preferable.
- the composition is such that the difference from the linear expansion coefficient of soft magnetic ferrite used as a magnetic material is within ⁇ 5 ppm / ° C.
- the RF tag according to the present invention has an IC connected to the magnetic antenna.
- the perspective view shown in FIG. 2 is a form in which an IC can be mounted on a magnetic antenna, but any form in which an IC installed separately from a magnetic antenna is connected by an electric circuit may be used.
- a terminal (9) to which an IC chip (10) can be connected is formed on the upper surface of an insulating layer (6) of a magnetic antenna, and an IC chip connection terminal, a coil lead terminal, May be fired integrally by connecting them in parallel or in series.
- the magnetic antenna having the IC chip connection terminal is provided with a through hole (1) in the insulating layer (6) on at least one surface of the coil (4) on which the electrode layer is formed. It can be obtained by pouring an electrode material into the hole (1), connecting it to both ends of the coil (4), forming a coil lead terminal and an IC chip connection terminal with the electrode material on the surface of the insulating layer, and firing them integrally.
- Inductance L 1 coil 1 connected in parallel of the RF tag according to the present invention fulfills the following equation 1, the combined inductance L 0 is satisfies the following relational expression 2.
- the RF tag according to the present invention is coated with a resin such as polystyrene, acrylonitrile styrene, acrylonitrile butadiene styrene, acrylic, polyethylene, polypropylene, polyamide, polyacetal, polycarbonate, vinyl chloride, modified polyphenylene ether, polybutylene terephthalate, polyphenylene sulfide, etc. May be.
- a resin such as polystyrene, acrylonitrile styrene, acrylonitrile butadiene styrene, acrylic, polyethylene, polypropylene, polyamide, polyacetal, polycarbonate, vinyl chloride, modified polyphenylene ether, polybutylene terephthalate, polyphenylene sulfide, etc. May be.
- a single layer or a magnetic layer (5) in which a mixture of magnetic powder and a binder is formed into a sheet is formed.
- the inner coil part the part forming through holes in e, f, i, j, m, and n in FIG. 3-2
- the outer coil part a, b, c, d in FIG. 3-2.
- G, h, k, and l to form a magnetic layer.
- an inner coil portion (a portion where through holes are formed in e, f, i, j, m, and n in FIG. 3-2) using the magnetic layer (5).
- an inner coil portion (a portion where through holes are formed in e, f, i, j, m, and n in FIG. 3-2) using the magnetic layer (5).
- a desired number of through holes (e, f, i, j, m, n) are opened in the laminated magnetic layer.
- An electrode material is poured into each of the through holes.
- the electrode layer (2) is formed on both surfaces perpendicular to the through hole so as to be connected to the through hole and have a coil shape (winding shape).
- a magnetic layer is laminated on the outer part where the inner coil is manufactured, and a through hole is formed in a part corresponding to a, b, c, d, g, h, k, l, etc. in FIG. .
- an electrode material is poured into the through holes, and electrode layers are formed so as to connect the through holes. At this time, for example, b ′ and c ′ are connected.
- a plurality of coils (4-1 in FIG. 2) are formed by the electrode material and the electrode layer poured into the through hole so that the magnetic layer becomes a rectangular core.
- a plurality of coils (4-1 in FIG. 2) are connected in parallel on the electric circuit. At this time, both ends of the magnetic layer forming the coils at both ends of the plurality of coils arranged in series are open on the magnetic circuit (4-2).
- insulating layers (6) are formed on the upper and lower surfaces of the coil on which the electrode layer (2) is formed.
- the obtained sheet is cut at the cut surface (6) along the through hole (1) and the coil open end surface (4-2) so as to have a desired shape, and is fired integrally, or the through hole after the integral firing. And can be manufactured by cutting at the coil open end face (LTCC technology).
- the magnetic antenna having the core shown in FIG. 4 according to the present invention can be manufactured, for example, by the following method.
- a magnetic layer formed by laminating a single layer or a plurality of layers in the form of a sheet obtained by mixing a mixture of magnetic powder and a binder is formed.
- a non-magnetic layer in which a mixture of non-magnetic powder and binder is formed into a sheet or a plurality of layers is formed.
- the magnetic layer (5) and the nonmagnetic layer (8) are alternately laminated so that the total thickness becomes a desired thickness.
- a desired number of through holes (1) are opened in the laminated magnetic layer and nonmagnetic layer.
- An electrode material is poured into each of the through holes.
- the electrode layer (2) is formed on both surfaces perpendicular to the through hole so as to be connected to the through hole and have a coil shape (winding shape).
- a coil is formed by the electrode material and the electrode layer poured into the through hole so that the magnetic layer becomes a rectangular core. At this time, both ends of the magnetic layer forming the coil are open on the magnetic circuit.
- insulating layers (6) are formed on the upper and lower surfaces of the coil on which the electrode layer is formed.
- the obtained sheet can be produced by cutting at the through hole and the coil open end face and integrally firing so as to have a desired shape, or by cutting at the through hole and the coil open end face after the integral firing.
- the conductive layer (7) in the present invention may be formed by any means, but is preferably formed by a usual method such as printing or brushing. Or it can affix on the outer side of the insulating layer which formed the metal plate, and can also provide the same effect.
- an Ag paste is suitable, and other metal-based conductive pastes such as other Ag-based alloy pastes can be used.
- the thickness of the conductive layer (7) is preferably 0.001 to 0.1 mm.
- the magnetic antenna according to the present invention is provided with a through hole in the insulating layer (6) on the lower surface of the coil (4), and an electrode material is poured into the through hole, and the coil (4).
- the electrodes may be connected to both ends, and a substrate connection electrode (14) may be formed on the lower surface of the substrate with an electrode material and integrally fired. In that case, it can be easily bonded to a substrate of ceramic, resin or the like.
- a composite of the above various materials, a metal-containing one, or the like can be used as the substrate.
- the substrate on which the magnetic antenna according to the present invention is mounted is characterized in that the magnetic antenna is fixed to the surface of the substrate (15) by means such as adhesive, adhesive, or soldering.
- a magnetic antenna is replaced with another component by means generally used when mounting a component on a multilayer wiring board by providing a substrate connection electrode or a substrate connection electrode that is not electrically connected with an electrode material. It can be mounted at the same time, and mass productivity is high.
- the multilayer wiring board has a built-in wiring composed of conductors, which has the same effect on the antenna as metal.
- the magnetic antenna is not affected by the metal because the magnetic antenna is structured as described above, and the wiring constituted by the conductor inside or on the surface of the multilayer wiring board or the like is not provided. Even if the substrate is formed, the characteristics are not significantly changed under the influence.
- the IC may be connected by forming an IC chip connection terminal on the insulating layer on the upper surface as shown in FIG. 2, or the substrate connection electrode (14 on the lower surface of the magnetic antenna as shown in FIG. ) May be formed in the substrate so as to be connected to each other and connected via the in-substrate wiring. Further, it may be connected to a reader / writer via an in-substrate wiring connected to the substrate connection terminal (14) on the lower surface, and can be used as a reader / writer.
- the magnetic antenna according to the present invention can be installed in a communication device.
- the magnetic antenna according to the present invention can be installed in the packaging container.
- the magnetic antenna according to the present invention can be installed on a metal part such as a tool or a bolt.
- the magnetic antenna according to the present invention has a bank so that a parasitic capacitance is not increased when a plurality of coils formed so that an electrode material is formed in a coil shape with a single magnetic core as a center are wound in a stacked manner.
- a plurality of coils are formed by winding, and the plurality of coils are connected in parallel on the electric circuit, and the coils are arranged in series on the shared magnetic core, thereby limiting the inductance of the coil that has been limited by the resonance frequency to be used.
- L 1 is increased as much as possible, the inductance L 0 of the magnetic antenna was controlled to the resonance frequency, improvement in communication sensitivity can be expected.
- the electromotive force e induced in the coil is expressed by the following formula (3) using the amount of change dI / dt of the unit time of current.
- the resonance frequency f 0 is determined by the following equation (4).
- the induced voltage of the tag due to the coupling between the RF tag and the reader / writer is expressed by the following formula (5) using the mutual inductance M.
- the inductance of the tag antenna is increased, the voltage induced in the tag can be increased and the degree of coupling can be increased.
- the combined inductance L 0 of the magnetic antenna is expressed by the following formula (6) when the inductance L 1 of each coil is equivalent.
- the inductance L1 of one coil connected in parallel can be designed to be large.
- the present invention while increasing the inductance L 1 of the respective coils, the combined inductance L 0 of the magnetic antenna itself by adjusted by connecting each coil to match the resonance frequency, the communication of the magnetic antenna The sensitivity could be improved.
- the parasitic capacitance of a plurality of coils connected in parallel can be reduced, the parasitic capacitance of one coil can be reduced, thereby reducing the combined parasitic capacitance and improving the communication sensitivity. Is.
- Designing a large Q is desirable for the resonance circuit because the power received by the coil is multiplied by Q.
- the fluctuation in communication sensitivity due to frequency deviation increases due to fluctuation due to variations in the external environment and IC. Therefore, it may be designed so as to satisfy the following formula (7).
- Ni—Zn—Cu ferrite calcined powder Fe 2 O 3 48.5 mol%, NiO 25 mol
- magnetic permeability as a material at 13.56 MHz becomes 100 after sintering at 900 ° C. %, ZnO 16 mol%, CuO 10.5 mol%)
- butyral resin 8 parts by weight plasticizer 5 parts by weight and solvent 80 parts by weight were mixed in a ball mill to produce a slurry.
- the resulting slurry was formed into a sheet by a doctor blade on a PET film so as to have a 150 mm square and a thickness of 0.1 mm upon sintering.
- Zn—Cu ferrite calcined powder (Fe 2 O 3 48.5 mol%, ZnO 41 mol%, CuO 10.5 mol%) 100 parts by weight, butyral resin 8 parts by weight Part, 5 parts by weight of plasticizer and 80 parts by weight of solvent were mixed with a ball mill to produce a slurry. The resulting slurry was formed into a sheet with the same size and thickness as the magnetic layer on a PET film with a doctor blade.
- a through hole is formed in the green sheet for the magnetic layer (5), and the Ag paste is filled therein, and the Ag paste is printed on both sides perpendicular to the through hole.
- the coils were stacked so that each coil was bank-wound, and five coils were connected in parallel.
- the insulating layer (6) green sheet was laminated on the upper and lower surfaces of the coil (4-1), and the insulating layer green sheet printed with the conductive layer (7) with Ag paste was laminated on one surface.
- the laminated green sheets are pressure-bonded together, cut at the through hole and coil open end face (4-2), and fired integrally at 900 ° C. for 2 hours.
- the number of turns of a size of 30 mm wide ⁇ 4 mm long is 23 turns.
- a magnetic antenna 1 in which five coils were connected in parallel was prepared. (In the figure, the number of coil turns is shown in a simplified manner. In addition, the number of laminated magnetic layers is simplified. The same applies to the other figures below.)
- an RF tag IC (IC capacitance: 23.5 pF) is connected to both ends of the coil of the magnetic antenna 1, and a capacitor is connected in parallel with the IC to adjust the resonance frequency to 13.56 MHz.
- IC capacitance: 23.5 pF IC capacitance: 23.5 pF
- the resonance frequency was determined by connecting a 1-turn coil to Agilent Technologies Inc. impedance analyzer E4991A, coupling this with an RF tag, and taking the peak frequency of the measured impedance as the resonance frequency.
- the combined inductance and the combined parasitic capacitance of the magnetic antenna were measured using an impedance analyzer E4991A.
- the inductance of each coil was measured for only one coil by cutting a wiring connecting a plurality of manufactured coils in parallel.
- the communication distance is determined by fixing the antenna of a reader / writer (product name: TR3-A201 / TR3-C201, manufactured by Takaya Co., Ltd.) with an output of 100 mW horizontally, and the longitudinal direction of the RF tag above it is perpendicular to the antenna.
- TR3-A201 / TR3-C201 manufactured by Takaya Co., Ltd.
- Ni—Zn—Cu ferrite calcined powder Fe 2 O 3 48.5 mol%, NiO 25 mol
- magnetic permeability as a material at 13.56 MHz becomes 100 after sintering at 900 ° C. %, ZnO 16 mol%, CuO 10.5 mol%)
- butyral resin 8 parts by weight, plasticizer 5 parts by weight and solvent 80 parts by weight were mixed in a ball mill to produce a slurry.
- the resulting slurry was formed into a sheet by a doctor blade on a PET film so as to have a 150 mm square and a thickness of 0.1 mm upon sintering.
- nonmagnetic layer (8) 100 parts by weight of borosilicate glass (SiO 2 86-89 wt%, B 2 O 3 7-10 wt%, K 2 O 0.5-7 wt%), butyral resin 8 parts by weight, plastic A slurry was prepared by mixing 5 parts by weight of the agent and 80 parts by weight of the solvent with a ball mill. The resulting slurry was formed into a sheet of 150 mm square on a PET film with a doctor blade so that the thickness upon sintering was 0.05 mm.
- borosilicate glass SiO 2 86-89 wt%, B 2 O 3 7-10 wt%, K 2 O 0.5-7 wt%
- plastic A slurry was prepared by mixing 5 parts by weight of the agent and 80 parts by weight of the solvent with a ball mill. The resulting slurry was formed into a sheet of 150 mm square on a PET film with a doctor blade so that the thickness upon sintering was 0.05 mm.
- Zn—Cu ferrite calcined powder (Fe 2 O 3 48.5 mol%, ZnO 41 mol%, CuO 10.5 mol%) 100 parts by weight, butyral resin 8 parts by weight Part, 5 parts by weight of plasticizer and 80 parts by weight of solvent were mixed with a ball mill to produce a slurry. The resulting slurry was formed into a sheet with the same size and thickness as the magnetic layer on a PET film with a doctor blade.
- a magnetic layer (5) green sheet and a non-magnetic layer (8) green sheet are laminated, one by one, and each sheet is pressure bonded.
- through-hole (1) is opened and filled with Ag paste, and 10 sheets of Ag paste are printed on both sides perpendicular to the through-hole (1), and each coil is wound in a bank.
- a coil (4) was formed.
- green sheets for insulating layer (6) are laminated on the upper and lower surfaces of coil (4), and conductive layer (7) is printed on one side with Ag paste. Sheets were laminated.
- the laminated green sheets are pressure-bonded together, cut at the through hole and coil open end face (4-2), and fired integrally at 900 ° C. for 2 hours.
- the number of turns of a size of 30 mm wide ⁇ 4 mm long is 23 turns.
- a magnetic antenna 2 in which five coils were connected in parallel was prepared.
- an RF tag IC was connected, a capacitor was connected in parallel with the IC, and the resonance frequency was adjusted to 13.56 MHz to produce an RF tag.
- the distance which communicates with the reader / writer of 100 mW output was measured.
- Magnetic antenna 3 A glass ceramic paste was printed at a thickness of 0.02 mm on a green sheet for a magnetic layer (5) produced in the same manner as the magnetic antenna 1, and 10 layers were laminated.
- a coil (4) was formed by winding.
- a green sheet for the insulating layer (6) formed by printing the conductive layer (7) with Ag paste on one surface of the coil (4) was laminated.
- a through hole is formed so as to connect to both ends of the coil, an Ag paste is filled therein, and an IC chip connection for connecting the coil lead terminal and the IC to the surface layer perpendicular to the through hole (1)
- the shape to be the terminal (9) was printed with Ag paste, and a green sheet for the insulating layer (6) was laminated.
- the above green sheets are pressure-bonded together, cut at the through hole (1) and the coil open end face (4-2), and integrally fired at 900 ° C. for 2 hours to wind a coil with a size of 10 mm wide ⁇ 3 mm long
- a magnetic antenna 3 having several 23 turns was prepared.
- An RF tag IC is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel with the IC to adjust the resonance frequency to 13.56 MHz.
- An RF tag is created, and communication is performed using a reader / writer with an output of 100 mW. The distance to be measured.
- the magnetic antenna 3 had a communication distance of 12.7 cm.
- the communication distance when attaching the metal plate was 10.5 cm.
- Magnetic antenna 4 A green sheet for the magnetic layer (5) and a glass ceramic green sheet for the nonmagnetic layer (8) produced in the same manner as the magnetic antenna 1 were formed in the same thickness of 0.1 mm, respectively. The obtained sheets were each cut to a width of 0.1 mm using a ceramic green sheet laminate cutting machine (G-CUT manufactured by UHT Corporation). Next, as shown in FIG. 4B, the magnetic layer and the nonmagnetic layer were arranged in a single sheet so as to be in order, and were pressure-bonded. 10 sheets of the obtained sheet are stacked in the vertical direction so that the magnetic layer and the nonmagnetic layer are in order, and prepared to be pressure-bonded. Through holes (1) are opened in each sheet, and an Ag paste is formed therein. 10 and Ag paste was printed on both sides perpendicular to the through-hole (1) and laminated, and each coil was turned into a bank to form a coil (4).
- G-CUT ceramic green sheet laminate cutting machine
- An insulating layer was formed on the obtained coil in the same manner as the magnetic antenna 1 to obtain a magnetic antenna 4.
- Magnetic antenna 5 A green sheet for the magnetic layer (5) and a glass ceramic green sheet for the nonmagnetic layer (8) produced in the same manner as the magnetic antenna 1 were formed in the same thickness of 0.1 mm, respectively.
- the obtained sheets were each cut at a width of 0.1 mm using a ceramic green sheet laminate cutting machine (G-CUT / UHT).
- G-CUT / UHT ceramic green sheet laminate cutting machine
- the magnetic layer and the nonmagnetic layer were arranged in a single sheet so as to be in order, and were pressure-bonded.
- the obtained sheets and 10 glass-ceramic ceramic green sheets are alternately stacked and prepared so that they can be pressure-bonded.
- Through holes (1) are opened in each sheet, and Ag paste is filled therein.
- 10 sheets of Ag paste were printed on both surfaces perpendicular to the through hole (1) and laminated, and each coil was wound in a bank to form a coil (4).
- An insulating layer was formed on the obtained coil in the same manner as the magnetic antenna 1 to obtain a magnetic antenna 5.
- a rod-like magnetic material for the magnetic layer (5) was produced using the slurry produced in the same manner as the magnetic antenna 1.
- the rod-shaped magnetic bodies prepared as shown in FIG. 4D were arranged in a container, and a nonmagnetic glass ceramic slurry was poured into a sheet having a thickness of 1 mm.
- the obtained sheet and 10 glass ceramic green sheets were stacked and prepared for pressure bonding.
- through holes (1) were opened in each sheet, and Ag paste was filled therein.
- Ten sheets of Ag paste were printed on both surfaces perpendicular to the through hole (1) and laminated, and each coil was bank-wound to form a coil (4).
- An insulating layer was formed on the obtained coil in the same manner as the magnetic antenna 1 to obtain a magnetic antenna 6.
- Magnetic antenna 7 comparative example Manufactured in the same manner as the magnetic antenna 1 except that one coil having 23 turns can be formed.
- the communication distance with a 100 mW reader / writer was 6.0 cm.
- Magnetic antenna 8 reference example It was manufactured in the same manner as the magnetic antenna 1 except that the coil was wound by solenoid winding.
- the parasitic capacitance of one coil was 4.5 pF.
- Table 1 shows the characteristics of the obtained magnetic antenna.
- any of the magnetic antennas according to the present invention can adjust the resonance frequency even if the inductance of the coil is designed to be large, and when the core is divided by a non-magnetic material, the effective magnetic permeability is high, and the miniaturization and communication are possible. It was confirmed that the antenna has both improved sensitivity.
- the parasitic capacitance of one coil can be reduced, and communication sensitivity can be improved.
- the length of the winding can be shortened, which is advantageous for downsizing.
- the magnetic antenna or RF tag according to the present invention has high communication sensitivity, it can be used for various applications such as various portable devices, containers, metal parts, substrates, metal tools, dies, and the like.
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Abstract
Description
L1 ≧ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L1:コイル1個のインダクタンス)
L0 ≦ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L0:磁性体アンテナの合成インダクタンス)
L1 ≧ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L1:コイル1個のインダクタンス)
L0 ≦ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L0:磁性体アンテナの合成インダクタンス)
L1 ≧ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
L0≦1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
L1 ≧ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
L0 ≦ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
本発明に係る磁性体アンテナは、一つの磁性体コアを中心として電極材料がコイル状となるように形成された複数のコイルを、巻線を重ねて巻く際に寄生容量が大きくならないようにバンク巻きでコイルを複数個形成し、その複数個のコイルを電気回路上並列に接続し、コイルは共有する磁性体コアに直列配置することで、使用する共振周波数に制限を受けていたコイルのインダクタンスL1を可能な限り大きくし、磁性体アンテナのインダクタンスL0は共振周波数に制御したので、通信感度の向上が期待できる。
e=―L(dI/dt)
f0=1/2π(L×C)
e=-M(dI/dt)=k((L1L2)^(1/2))×(dI/dt)
L1:リーダ/ライタのアンテナのインダクタンス
L2:タグのアンテナのインダクタンス
L0=L1(コイル1個分)/コイルの個数
C0=C1(コイル1個分)×コイルの個数
Q=13.56MHz/(利用する帯域)
磁性層(5)用として、900℃焼結後に13.56MHzでの材料としての透磁率が100になるNi-Zn-Cuフェライト仮焼粉(Fe2O3 48.5モル%、NiO 25モル%、ZnO 16モル%、CuO 10.5モル%)100重量部、ブチラール樹脂8重量部、可塑剤5重量部、溶剤80重量部をボールミルで混合しスラリーを製造した。出来たスラリーをドクターブレードでPETフィルム上に150mm角で、焼結時の厚みが0.1mmになるようにシート成型した。
共振周波数は、アジレントテクノロジー株式会社インピーダンスアナライザーE4991Aに1ターンコイルを接続し、これとRFタグを結合させ、測定されるインピーダンスのピーク周波数をもって共振周波数とした。
交信距離は、出力100mWのリーダ/ライタ(株式会社タカヤ製、製品名TR3-A201/TR3-C201)のアンテナを水平に固定し、その上方にRFタグの長手方向をアンテナに対して垂直に位置させて、13.56MHzで交信が可能な限り高い位置の時のアンテナとRFタグの垂直方向の距離を交信距離とした。
磁性層(5)用として、900℃焼結後に13.56MHzでの材料としての透磁率が100になるNi-Zn-Cuフェライト仮焼粉(Fe2O3 48.5モル%、NiO 25モル%、ZnO 16モル%、CuO 10.5モル%)100重量部、ブチラール樹脂8重量部、可塑剤5重量部、溶剤80重量部をボールミルで混合しスラリーを製造した。出来たスラリーをドクターブレードでPETフィルム上に150mm角で、焼結時の厚みが0.1mmになるようにシート成型した。
磁性体アンテナ1と同様に製造した磁性層(5)用グリーンシートにガラスセラミックのペーストを0.02mmの厚みで印刷し、10層積層した。
磁性体アンテナ1と同様に製造した磁性層(5)用グリーンシートと非磁性層(8)用のガラスセラミックのグリーンシートを、それぞれ同様の厚み0.1mmで成膜した。得られたシートをそれぞれ0.1mm幅でセラミックグリーンシート積層体切断機(UHT株式会社製G-CUT)を用いて切断した。次いで、図4(b)に示すように磁性層と非磁性層が順番になるように1枚のシート状に並べて加圧接着した。得られたシートを縦方向にも磁性層と非磁性層が順番になるよう10枚積み重ねて加圧接着できるよう準備し、一つ一つのシートにスルーホール(1)を開けその中にAgペーストを充填して、かつスルーホール(1)と直角になる両面にAgペーストを印刷して10枚積層し、各コイルをバンク巻きとし、コイル(4)を形成した。
磁性体アンテナ1と同様に製造した磁性層(5)用グリーンシートと非磁性層(8)用のガラスセラミックのグリーンシートを、それぞれ同様の厚み0.1mmで成膜した。得られたシートをそれぞれ0.1mm幅でセラミックグリーンシート積層体切断機(G-CUT/UHT)を用いて切断した。次いで、図4(c)に示すように磁性層と非磁性層が順番になるように1枚のシート状に並べて加圧接着した。得られたシートとガラスセラセラミックのグリーンシートを交互に10枚ずつ積み重ねて加圧接着できるよう準備し、一つ一つのシートにスルーホール(1)を開けその中にAgペーストを充填して、かつスルーホール(1)と直角になる両面にAgペーストを印刷して10枚積層し、各コイルをバンク巻きとし、コイル(4)を形成した。
磁性体アンテナ1と同様に製造したスラリーを用いて、磁性層(5)用の棒状の磁性体を作製した。図4(d)に示すように作成した棒状の磁性体を容器内に並べ、非磁性ガラスセラミックのスラリーを流し込み厚み1mmのシートを作製した。得られたシートとガラスセラミックのグリーンシート10枚積み重ねて加圧接着できるよう準備し、図4に示すように、一つ一つのシートにスルーホール(1)を開けその中にAgペーストを充填して、かつスルーホール(1)と直角になる両面にAgペーストを印刷して10枚積層し、各コイルをバンク巻きとし、コイル(4)を形成した。
巻き数が23ターンのコイルが1個形成できるようにした以外は、前記磁性体アンテナ1と同様に製造した。100mWのリーダ/ライタで交信する距離は6.0cmであった。
コイルの巻き方をソレノイド巻きで作製した以外は前記磁性体アンテナ1と同様に製造した。1個のコイルの寄生容量は4.5pFであった。
2:電極層(コイル電極)
3:コア
4:コイル
4-1:コイルの最小単位
4-2:コイル開放端面
5:磁性層
6:絶縁層
7:導電層
8:非磁性層
9:IC接続用電極層(端子)
10:IC
11:コンデンサー電極
12:コンデンサー
14:基板接続用電極層
15:基板
20:磁性体アンテナ
Claims (5)
- 電磁誘導方式を利用し情報を送受信するための磁性体アンテナにICを実装したRFタグであり、前記磁性体アンテナは一つの磁性体コアに、インダクタンスL1が関係式(1)を満たすコイルを複数個形成するとともに各コイルの巻き方をバンク巻きとし、前記各コイルは電気回路上並列に接続し、且つ、磁性体コアに直列に配置しており、磁性体アンテナの合成インダクタンスL0が関係式(2)を満たすことを特徴とするRFタグ。
<関係式(1)>
L1 ≧ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L1:コイル1個のインダクタンス)
<関係式(2)>
L0 ≦ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L0:磁性体アンテナの合成インダクタンス) - 請求項1記載のRFタグを樹脂で被覆した複合RFタグ。
- 請求項1記載のRFタグに用いる磁性体アンテナであって、該磁性体アンテナはICを実装した際に、一つの磁性体コアにインダクタンスL1が関係式(1)を満たすコイルを複数個形成するとともに各コイルの巻き方をバンク巻きとし、前記各コイルは電気回路上並列に接続し、且つ、磁性体コアに直列に配置しており、磁性体アンテナの合成インダクタンスL0が関係式(2)を満たすことを特徴とする磁性体アンテナ。
<関係式(1)>
L1 ≧ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L1:コイル1個のインダクタンス)
<関係式(2)>
L0 ≦ 1/(4π2×(動作周波数)2×(IC容量+アンテナの寄生容量))
(L0:磁性体アンテナの合成インダクタンス) - 請求項1記載のRFタグ又は請求項2記載の複合RFタグを実装した基板。
- 請求項1記載のRFタグ又は請求項2記載の複合RFタグを用いた通信システム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180037745.XA CN103053075B (zh) | 2010-08-04 | 2011-07-28 | Rf标签、磁性体天线和安装有该rf标签的基板、通信系统 |
KR1020137002573A KR101898741B1 (ko) | 2010-08-04 | 2011-07-28 | Rf 태그, 자성체 안테나 및 그 rf 태그를 실장한 기판, 통신 시스템 |
US13/813,990 US9311590B2 (en) | 2010-08-04 | 2011-07-28 | RF tag, magnetic antenna, board mounted with the RF tag, and communication system |
EP11814547.3A EP2602868B1 (en) | 2010-08-04 | 2011-07-28 | Rf tag, magnetic antenna, substrate with the rf tag mounted thereon, and communication system |
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JP2010175468A JP5403279B2 (ja) | 2010-08-04 | 2010-08-04 | Rfタグの製造方法、磁性体アンテナの製造方法及び当該rfタグを実装した基板、通信システム |
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EP (1) | EP2602868B1 (ja) |
JP (1) | JP5403279B2 (ja) |
KR (1) | KR101898741B1 (ja) |
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WO2011118379A1 (ja) * | 2010-03-24 | 2011-09-29 | 株式会社村田製作所 | Rfidシステム |
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US20130206845A1 (en) | 2013-08-15 |
JP5403279B2 (ja) | 2014-01-29 |
EP2602868A4 (en) | 2014-08-06 |
JP2012039242A (ja) | 2012-02-23 |
CN103053075B (zh) | 2015-02-25 |
EP2602868B1 (en) | 2020-09-02 |
CN103053075A (zh) | 2013-04-17 |
US9311590B2 (en) | 2016-04-12 |
TWI539382B (zh) | 2016-06-21 |
TW201229919A (en) | 2012-07-16 |
KR101898741B1 (ko) | 2018-09-13 |
EP2602868A1 (en) | 2013-06-12 |
KR20130142991A (ko) | 2013-12-30 |
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