WO2015015604A1 - Rfidタグ、及び、rfidシステム - Google Patents
Rfidタグ、及び、rfidシステム Download PDFInfo
- Publication number
- WO2015015604A1 WO2015015604A1 PCT/JP2013/070792 JP2013070792W WO2015015604A1 WO 2015015604 A1 WO2015015604 A1 WO 2015015604A1 JP 2013070792 W JP2013070792 W JP 2013070792W WO 2015015604 A1 WO2015015604 A1 WO 2015015604A1
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- WIPO (PCT)
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- rfid tag
- antenna element
- antenna
- terminal
- loop antenna
- Prior art date
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
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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
-
- 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
- G06K19/0775—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 arrangements for connecting the integrated circuit to the antenna
- G06K19/07756—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 arrangements for connecting the integrated circuit to the antenna the connection being non-galvanic, e.g. capacitive
-
- 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
- G06K19/07766—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 comprising at least a second communication arrangement in addition to a first non-contact communication arrangement
- G06K19/07767—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 comprising at least a second communication arrangement in addition to a first non-contact communication arrangement the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
-
- 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
- G06K19/07771—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 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
-
- 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
- G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
-
- 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
- G06K19/07788—Antenna details the antenna being of the capacitive type
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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
- 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
- H01Q1/36—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
Definitions
- the present invention relates to an RFID (RF identification) tag and an RFID system.
- a wireless communication circuit having a first terminal and a second terminal for connecting an antenna, and a first curved surface are formed, and the first terminal is connected to the first terminal in the first curved surface.
- a first terminal having a first region at a second end opposite to the first end in the first curved surface.
- the wireless tag further forms a second curved surface, and has a fourth terminal connected to the second terminal at a third end portion in the second curved surface, and the third tag in the second curved surface.
- a fourth region on a side opposite to the end portion has a second region, the first region and the second region overlap in parallel with each other, and the first curved surface and the second curved surface form a loop antenna;
- a second conductor is provided (see, for example, Patent Document 1).
- the resonance frequency of a conventional wireless tag differs between when it is attached to a metal member and when it is attached to a non-metal member. This is because when the antenna is attached to a metal member, the impedance of the antenna of the wireless tag changes due to the influence of the metal member.
- the distance that the wireless tag can communicate is the longest when communicating at the resonance frequency.
- the wireless tag communicates at the resonance frequency obtained when it is attached to a non-metallic member, a sufficient communication distance cannot be obtained when the wireless tag is attached to the metallic member. It may not be possible.
- an object of the present invention is to provide an RFID tag and an RFID system that can perform stable communication regardless of whether they are attached to a metal member or a non-metal member.
- An RFID tag includes a plate-shaped base portion made of a dielectric, and a first antenna element and a second antenna element formed around the base portion, and having a wavelength higher than a wavelength at a resonance frequency.
- a loop antenna having a short loop length and an IC chip disposed on the first surface side of the base portion and connected between a first terminal of the first antenna element and a second terminal of the second antenna element The loop antenna has a first end portion of the first antenna element and a second end portion of the second antenna element on a second surface side opposite to the first surface of the base portion.
- the capacitance of the overlapping portion is an inductance of the loop antenna when the second surface of the base portion is attached to a metal member.
- the first and second terminals are obtained from the inductance of the loop antenna when the second surface of the base portion is attached to a non-metallic member and the capacitance of the overlapping portion. 2
- the adjustment is made so that the difference between the imaginary number component of the combined impedance is equal to or less than a predetermined difference.
- FIG. 1 is a diagram showing an RFID tag 100 according to Embodiment 1.
- FIG. It is a figure which shows the structure which removed the IC chip 130 from the RFID tag 100 shown in FIG. 2 is a diagram showing a sticking surface (bottom surface) of the RFID tag 100.
- FIG. It is a figure which shows the pattern of the upper surface side of the antenna elements 110 and 120.
- FIG. It is a figure which shows the inlay 150.
- FIG. It is a figure which shows the base part. 2 is a diagram showing an equivalent circuit of the RFID tag 100.
- FIG. 6 is a diagram for explaining changes in characteristics of the loop antenna 140 when the RFID tag 100 according to Embodiment 1 is attached to a metal member 500.
- FIG. 6 is a diagram for explaining changes in characteristics of the loop antenna 140 when the RFID tag 100 according to Embodiment 1 is attached to a metal member 500.
- FIG. 6 is a diagram for explaining changes in characteristics of the loop antenna 140 when the RFID tag 100 according to Embodiment 1 is attached to
- FIG. 6 is a diagram showing a mirror image current flowing in the metal member 500 when the RFID tag 100 of Embodiment 1 is attached to the metal member 500.
- FIG. It is a figure which shows each resonant frequency with the case where the RFID tag 100 of Embodiment 1 is affixed on the metal member 500, and the case where it is not affixed. It is a figure which shows the method of adjusting the space
- FIG. 6 is a diagram illustrating characteristics of susceptance B with respect to a distance D of an adjustment unit 115. It is a figure which shows the characteristic of the resonant frequency with respect to the space
- FIG. 1 is a diagram illustrating an RFID system 800 using the RFID tag 100 according to Embodiment 1.
- FIG. 6 is a diagram illustrating an RFID tag 200 according to Embodiment 2.
- FIG. 6 is a diagram illustrating an inlay 250 included in the RFID tag 200 according to Embodiment 2.
- FIG. 1 is a diagram illustrating an RFID system 800 using the RFID tag 100 according to Embodiment 1.
- FIG. 6 is a diagram illustrating an RFID tag 200 according to Embodiment 2.
- FIG. 6 is a diagram illustrating an inlay 250 included in the RFID tag 200 according to Embodiment 2.
- FIG. 1 shows an RFID tag 100 according to the first embodiment.
- the RFID tag 100 includes a base portion 101, a sheet portion 105, antenna elements 110 and 120, and an IC chip 130.
- the sheet part 105, the antenna elements 110 and 120, and the IC chip 130 constitute the inlay 150.
- FIGS. 2 to 6 will be used in addition to FIG. 1 to 6, a common XYZ coordinate system is defined.
- FIG. 2 is a diagram showing a configuration in which the IC chip 130 is removed from the RFID tag 100 shown in FIG.
- FIG. 3 is a diagram illustrating a sticking surface (bottom surface) of the RFID tag 100.
- FIG. 4 is a diagram showing a pattern on the upper surface side of the antenna elements 110 and 120.
- FIG. 5 is a diagram showing the inlay 150.
- FIG. 6 is a diagram showing the base unit 101.
- the surface on which the IC chip 130 of the thin RFID tag 100 is mounted is referred to as a top surface, and the surface opposite to the top surface is referred to as a bottom surface.
- the bottom surface is an affixing surface for adhering the RFID tag 100 to a metal object or a non-metal object using an adhesive or the like.
- an RFID tag 100 having a resonance frequency of 865 MHz will be described as an example. That is, in the RFID tag 100 according to the first embodiment, the dimensions, inductance, capacitance, and the like of each part are optimized so that the resonance frequency is 865 MHz. When the resonance frequency is set to a frequency other than 865 MHz, the size, inductance, capacitance, and the like of each part may be optimized in accordance with a desired resonance frequency.
- the base portion 101 is a thin plate (cuboid) member as shown in FIGS. 1 and 6.
- the base portion 101 may be made of a dielectric, and can be made of, for example, ABS resin, PET (Polyethylene terephthalate) resin, polycarbonate resin, PVC (polyvinyl chloride) resin, or the like.
- an inlay 150 (see FIG. 5) is wound around the base portion 101 in the longitudinal direction (X-axis direction).
- the base portion 101 has a length in the X-axis direction of about 52 mm, a width in the Y-axis direction of about 7 mm, and a thickness in the Z-axis direction of about 2 mm.
- both ends of the base portion 101 in the longitudinal direction are referred to as end portions 101A and 101B.
- the sheet portion 105 is a rectangular film in plan view, and the antenna elements 110 and 120 are formed on one surface.
- the sheet portion 105 is an example of a sheet member.
- the sheet portion 105 is, for example, a PET film, a PET resin, or a film-like member made of paper.
- the sheet portion 105 shown in FIG. 5 has a length in the X-axis direction of about 120 mm, a width in the Y-axis direction of about 6 mm, and a thickness in the Z-axis direction of about 0.1 mm.
- the sheet portion 105 is bonded to the base portion 101 in a state where the antenna elements 110 and 120 are formed on one surface and the IC chip 130 is mounted. That is, the sheet part 105 is wound around and adhered to the sheet part 101 in a state where the inlay 150 (see FIG. 5) is completed.
- the antenna element 110 is formed in an approximately half region in the longitudinal direction of one surface of the sheet portion 105.
- the antenna element 110 is an example of a first antenna element.
- the antenna element 110 includes an element 111, a protruding portion 112, a terminal 113, a protruding portion 114, and an adjusting portion 115 (see FIG. 5), as shown in FIGS. 1, 2, 4, and 5.
- the antenna element 110 constructs an antenna element 120 and a loop antenna 140.
- an end portion on the upper surface of the base portion 101 and connected to the IC chip 130 is referred to as an end portion 110A
- an end portion located on the lower surface of the base portion 101 is referred to as an end portion 110B.
- the end 110B is an example of a first end.
- the antenna element 110 can be manufactured, for example, by applying a silver paste by screen printing.
- the antenna element 110 may be made of metal, and may be aluminum or copper.
- the element 111 is a radiating portion that is rectangular in a plan view, and the protruding portion 112, the terminal 113, and the protruding portion 114 are connected to the end portion 110A side, and the adjusting portion 115 is connected to the end portion 110B side.
- the element 111 is provided from the end portion 110A side located on the upper surface side of the base portion 101 to the end portion 110B side located on the bottom surface side of the base portion 101, and is bent on the end portion 101A side of the base portion 101. Yes.
- the element 111 is overlapped with the element 121 on the end portion 110B side. That is, the end portion 110 ⁇ / b> B of the antenna element 110 is overlapped with the end portion 120 ⁇ / b> B of the antenna element 120. Further, the adjustment unit 115 connected to the end portion 110B is also overlapped with the end portion 120B.
- the part where the end part 110B and the adjustment part 115 overlap with the end part 120B in plan view constitutes an overlapping part 160.
- the end portion 110B, the adjustment portion 115, and the end portion 120B are insulated by the sheet portion 105.
- the protruding portions 112 and 114 extend so as to protrude in the longitudinal direction from the element 111 on the end portion 110A side.
- the protrusions 112 and 114 are formed at positions that are axially symmetric with respect to the central axis along the longitudinal direction of the RFID 100.
- the width of the projecting portions 112 and 114 is the same, and each has a uniform width (width in the Y-axis direction) from the side connected to the element 111 to the tip on the X-axis positive direction side.
- the protrusions 112 and 114 are arranged so as to be nested with the protrusions 122, 123, and 124 of the antenna element 120 in plan view.
- the projecting portions 112 and 114, the terminal 113, and the projecting portions 122, 123, and 124 constitute the interdigital unit 170.
- the interdigital unit 170 functions as a capacitor having a predetermined capacitance.
- the interdigital unit 170 can be handled as a capacitor connected in parallel to the loop antenna 140 constructed by the antenna elements 110 and 120.
- each dimension such as the interval may be set to an optimum value in order to set the capacitance of the interdigital unit 170 to a desired value.
- the terminal 113 extends on the end portion 110A side so as to protrude in the X-axis positive direction from the element 111 along the longitudinal direction.
- the terminal 113 is an example of a first terminal.
- the width of the terminal 113 (the width in the Y-axis direction) is uniform from the side connected to the element 111 to the tip on the X-axis positive direction side.
- the width of the terminal 113 is about twice the width of the protrusions 112 and 114.
- the width of the terminal 113 is larger than that of the protruding portions 112 and 114 within a limited width in the Y-axis direction.
- the width of the terminal 113 is equal to the width of the protruding portion 123 connected via the IC chip 130.
- the terminal 113 is located between the protrusions 112 and 114.
- the IC chip 130 is connected to the terminal 113 as shown in FIG.
- the terminal 113 is formed with a space in the X-axis direction between the terminal 123A at the tip of the protruding portion 123, as shown in FIGS. .
- One of the two terminals of the IC chip 130 is connected to the terminal 113 by solder or the like.
- the adjustment unit 115 has two elongated patterns, and extends on the end 110B side so as to protrude from the element 111 in the longitudinal direction.
- the adjustment unit 115 is an example of a first protrusion.
- the adjustment unit 115 overlaps the end 120B of the antenna element 120.
- the adjustment portion 115 and the end portion 120B are insulated by the sheet portion 105.
- the adjustment unit 115 is included in the duplication unit 160.
- the adjustment unit 115 is provided to adjust the impedance of the loop antenna 140 constructed by the antenna elements 110 and 120. For example, the length of the adjustment unit 115 in the X-axis direction, the width in the Y-axis direction, or the height in the Z-axis direction, and the adjustment of the distance D between the two adjustment units 115 shown in FIG. By performing the above, the impedance of the loop antenna 140 can be adjusted.
- the edge 115A on the Y axis positive direction side of the adjustment unit 115 on the Y axis positive direction side is more than the edge 110C1 on the Y axis positive direction side of the antenna element 110. It is offset to the Y axis negative direction side (center side in the width direction of the antenna element 110).
- edge 115B on the Y axis negative direction side of the adjustment unit 115 on the Y axis negative direction side is closer to the Y axis positive direction side (the antenna element 110) than the edge 110C2 on the Y axis negative direction side of the antenna element 110. Is offset to the center side in the width direction.
- the end side 115A is offset to the Y axis negative direction side (center side in the width direction of the antenna element 110) from the end side 110C1, and the end side 115B is offset from the end side 110C2 to the Y axis positive direction side (antenna element). 110 is offset to the center side in the width direction.
- the antenna element 120 is formed in an approximately half region in the longitudinal direction of one surface of the sheet portion 105.
- the antenna element 120 is an example of a second antenna element.
- the antenna element 120 has an element 121 and projecting portions 122, 123, and 124 as shown in FIGS. 1, 2, 4, and 5.
- FIG. The antenna element 120 constructs the antenna element 120 and the loop antenna 140.
- an end portion on the upper surface of the base portion 101 and connected to the IC chip 130 is referred to as an end portion 120A
- an end portion located on the lower surface of the base portion 101 is referred to as an end portion 120B. Call it.
- the end 120B is an example of a second end.
- the antenna element 120 can be manufactured, for example, by applying a silver paste by screen printing.
- the antenna element 120 may be made of metal, and may be aluminum or copper.
- the element 121 is a rectangular radiating portion in plan view, protruding portions 122, 123, and 124 are connected to the end portion 120A side, and the end portion 120B has an end side 125 parallel to the Y-axis direction.
- the element 121 is provided from the end 120A side positioned on the upper surface side of the base portion 101 to the end portion 120B side positioned on the bottom surface side of the base portion 101, and is bent on the end portion 101B side of the base portion 101. Yes.
- the element 121 is overlapped with the element 111 on the end 120B side. That is, the end portion 120B of the antenna element 120 overlaps with the end portion 110B of the antenna element 110 and the adjustment unit 115 to construct an overlapping portion 160.
- the end portion 120B, the end portion 110B, and the adjustment portion 115 are insulated by the sheet portion 105.
- the protruding portions 122, 123, and 124 extend so as to protrude in the longitudinal direction from the element 121 on the end portion 120A side.
- the protrusions 122 and 124 are formed at positions that are axially symmetric with respect to the central axis along the longitudinal direction of the RFID 100.
- the protrusions 122 and 124 extend in the negative X-axis direction from the element 121 along the edges extending in the X-axis direction at both ends of the antenna element 120 in the width direction (Y-axis direction).
- the protrusions 122 and 124 have the same width (width in the Y-axis direction), and each has a uniform width (width in the Y-axis direction) from the side connected to the element 121 to the tip on the X-axis negative direction side.
- the protrusion 123 is located between the protrusions 122 and 124, and extends in the negative direction of the X axis on the central axis along the longitudinal direction of the RFID 100.
- a terminal 123 ⁇ / b> A (see FIGS. 2 and 4) is formed at the tip of the protruding portion 123.
- the IC chip 130 is connected to the terminal 123A as shown in FIG.
- the terminal 123A is formed with an interval in the X-axis direction between the terminal 113 and the terminal 113 as shown in FIGS.
- the terminal 123A is an example of a second terminal.
- the other of the two terminals of the IC chip 130 is connected to the terminal 123A by solder or the like.
- the protrusion 123 has a uniform width (width in the Y-axis direction) from the side connected to the element 121 to the terminal 123A at the tip.
- the width of the protrusion 123 is about twice the width of the protrusions 122 and 124.
- the width of the protruding portion 123 is larger than the protruding portions 122 and 124 within the limited width in the Y-axis direction.
- the width of the protrusion 123 is equal to the width of the terminal 113 connected via the IC chip 130.
- the protrusions 122, 123, and 124 are arranged so as to be nested with the protrusions 112 and 114 and the terminal 113 of the antenna element 110 in a plan view.
- the protrusions 122, 123, and 124, the protrusions 112 and 114, and the terminal 113 constitute the interdigital unit 170.
- the IC chip 130 has two terminals and is mounted on the surface of the sheet portion 105.
- the two terminals of the IC chip 130 are connected to the terminals 113 and 123A by solder or the like, respectively.
- the IC chip 130 is electrically connected to the antenna elements 110 and 120, and stores data representing a unique ID in an internal memory chip.
- the IC chip 130 When the IC chip 130 receives a signal for reading in the RF (Radio Frequency) band from the reader / writer of the RFID tag 100 via the antenna elements 110 and 120, the IC chip 130 operates with the power of the received signal, and the data representing the ID is transmitted to the antenna element. 110 and 120 are transmitted. Thereby, the ID of the RFID tag 100 can be read by the reader / writer.
- RF Radio Frequency
- the overlapping portion 160 is a portion where the end portion 110B of the antenna element 110 and the end portion 120B of the antenna element 120 overlap as shown in FIG.
- the overlapping portion 160 is provided to adjust the resonance frequency of the RFID tag 100.
- the electrostatic capacity of the overlapping portion 160 is determined by the overlapping area between the end portions 110B and 120B and the interval between the end portions 110B and 120B.
- the overlapping portion 160 has a portion overlapping with the end portions 110A and 120A in plan view.
- the overlapping part 160 and the interdigital part 170 have overlapping parts. As described above, since the overlapping portion 160 and the interdigital unit 170 overlap in the Z-axis direction, it is possible to secure a capacitance between the overlapping portion 160 and the interdigital portion 170.
- the overlapping portions may be provided in any combination.
- the end 110A and the end 120B may overlap, or only the end 120A and the end 110B may overlap.
- the interdigital unit 170 is constructed by projecting portions 112 and 114, a terminal 113, and projecting portions 122, 123, and 124 that are arranged in a nested manner in parallel in a plan view.
- the interdigital unit 170 increases the capacitance generated by the protrusions 112 and 114, the terminal 113, and the protrusions 122, 123, and 124 being arranged close to each other, so that the loop antenna 140 of the RFID tag 100 can be It is provided to adjust the resonance frequency.
- the interdigital unit 170 is formed over the antenna elements 110 and 120. A portion of the interdigital unit 170 formed in the antenna element 110 is included in the end portion 110A. In addition, a portion of the interdigital unit 170 formed on the antenna element 120 is included in the end 120A.
- FIG. 7 is a diagram showing an equivalent circuit of the RFID tag 100.
- the loop antenna 140 constructed by the antenna elements 110 and 120 can be represented by a resistor Ra and an inductor L1.
- the loop antenna 140 is provided with the overlapping portion 160 and the interdigital portion 170. Therefore, in FIG. 7, a capacitor Ca is connected in parallel to the resistor Ra and the inductor L1. Capacitor Ca is obtained by combining overlapping portion 160 and interdigital portion 170 and representing it as one capacitor.
- the IC chip 130 of the RFID tag 100 can be represented by a resistor Rc and a capacitor Cc.
- the loop antenna 140 includes a resistance component, an inductance component, and a capacitance component
- the IC chip 130 can be represented by a resistance component and a capacitance component.
- the resistor Ra is a resistor having a resistance value Ra
- the inductor L1 is an inductor having an inductance L1
- the capacitor Ca is a capacitor having a capacitance Ca.
- the resistor Rc is a resistor having a resistance value Rc
- the capacitor Cc is a capacitor having a capacitance Cc.
- Rc is 2000 ⁇ and Cc is about 1.0 pF. This is an average value obtained with a general IC chip.
- the RFID tag 100 performs communication by causing resonance in the equivalent circuit shown in FIG. That is, when the RFID tag 100 receives a signal for reading and transmits data representing an ID, a current due to resonance flows through the IC chip 130 and the antenna elements 110 and 120.
- the resonance frequency of the resonance current is mainly determined by the capacitance of the IC chip 130, the inductances of the antenna elements 110 and 120, the capacitance of the overlapping portion 160, and the capacitance of the interdigital portion 170.
- the resonance frequency of the RFID tag 100 is obtained by the general formula (1).
- Expression (1) When Expression (1) is applied to the RFID tag 100, L in Expression (1) is the inductance L1 of the antenna elements 110 and 120, and C in Expression (1) is the capacitance Cc of the IC chip 130 and the overlapping portion 160. And the capacitance Ca of the interdigital unit 170.
- the resonance frequency of the RFID tag 100 is not determined only by the loop antenna 140 (antenna elements 110 and 120), but the loop antenna 140 (antenna elements 110 and 120), the overlapping part 160, the interdigital part 170, and It depends on the IC chip 130.
- the loop antenna 140 included in the RFID tag 100 is different from a so-called loop antenna that causes resonance when the loop length is set to the length of one wavelength at the resonance frequency.
- the resonance frequency of the resonance current in the RFID tag 100 of the first embodiment is a frequency (communication frequency) at which the RFID tag 100 performs communication, and is set to 865 MHz as an example.
- the loop length of the loop antenna 140 constructed by the antenna elements 110 and 120 is about 110 mm, and is set shorter than the wavelength at the resonance frequency.
- the wavelength at the resonance frequency is about 348.6 mm, but the loop length of the loop antenna 140 of the RFID tag 100 is about 110 mm.
- the antenna element 110 that constructs the loop antenna 140. And 120 function as inductors.
- the combined length (loop length) of the antenna elements 110 and 120 is relatively short as described above, and the inductance of the antenna elements 110 and 120 is proportional to the length, so the inductance of the loop antenna 140 is relatively small. . Therefore, in the RFID tag 100, in order to compensate for the small inductance, the resonance frequency is adjusted by providing the loop antenna 140 with the overlapping portion 160 and the interdigital portion 170.
- the impedance of the antenna obtained by adding the overlapping portion 160 and the interdigital portion 170 to the loop antenna 140 constructed by the antenna elements 110 and 120 is the resistance value (Ra) of the resistor Ra and the inductance ( L1) and the capacitance (Ca) of the capacitor Ca.
- the impedance of the IC chip 130 is determined by the resistance value (Rc) of the resistor Rc and the capacitance (Cc) of the capacitor Cc.
- the resistance value Ra and the resistance value Rc may be adjusted in addition to the adjustment of the inductance L1, the capacitance Ca, and the capacitance Cc.
- FIG. 8 is a diagram for explaining a change in characteristics of the loop antenna 140 when the RFID tag 100 according to Embodiment 1 is attached to the metal member 500.
- FIG. 9 is a diagram illustrating a mirror image current that flows in the metal member 500 when the RFID tag 100 according to Embodiment 1 is attached to the metal member 500.
- FIG. 10 is a diagram showing the respective resonance frequencies when the RFID tag 100 of Embodiment 1 is attached to the metal member 500 and when it is not attached.
- the interdigital unit 170 is omitted in order to pay attention to a change in the capacitance of the loop antenna 140 on the bottom surface side of the base unit 101 (see FIG. 1).
- the capacitance Cm1 is formed between the loop antenna 140 and the metal member 500 on the bottom surface side.
- Cm2 is generated.
- Cg of the overlapping portion 160 on the bottom surface side of the loop antenna 140 is also a capacitance Cg of the overlapping portion 160 on the bottom surface side of the loop antenna 140.
- the inductances of the antenna elements 110 and 120 at this time are Lm1 and Lm2, respectively.
- FIG. 8B illustrates a state where the adhesive sheet 400 is attached to the bottom surface of the RFID tag 100.
- the capacitance Cg of the overlapping portion 160 exists on the bottom surface side of the loop antenna 140.
- the inductances of the antenna elements 110 and 120 at this time are La1 and La2, respectively.
- the loop antenna 140 in which the loop is arranged in a direction perpendicular to the surface to be attached is attached to the metal member 500, whereby a larger current loop can be obtained. Therefore, when the loop antenna 140 is attached to the metal member 500, the current distribution and the current value change compared to the case where the loop antenna 140 is not attached to the metal member 500 (see FIG. 8B).
- the inductances Lm1 and Lm2 of the antenna elements 110 and 120 shown in FIG. 8A are different from the inductances La1 and La2 of the antenna elements 110 and 120 shown in FIG. 8B.
- capacitances Cm1 and Cm2 are generated on the bottom surface side of the loop antenna 140.
- the presence of the capacitances Cm1 and Cm2 is the same as that the capacitors having the capacitances Cm1 and Cm2 are connected in parallel to the loop antenna 140.
- the loop antenna 140 is used when the RFID tag 100 is attached to the metal member 500 (see FIG. 8A) and when the RFID tag 100 is not attached to the metal member 500 (see FIG. 8B). Therefore, the resonance frequency of the RFID tag 100 is different.
- the resonance frequency when the RFID tag 100 is attached to the metal member 500 is f0
- the resonance frequency when the RFID tag 100 is not attached to the metal member 500 is f1.
- the resonance frequency of the RFID tag 100 is higher when it is attached to the metal member 500 and the capacitances Cm1 and Cm2 exist on the bottom surface side of the loop antenna 140. That is, f1 ⁇ f0 holds. This is clear from equation (1).
- the capacitances Cm1 and Cm2 are added to the loop antenna 140, so that the capacitance Cg of the overlapping portion 160 is changed.
- the capacitance of the overlapping portion 160 can be changed, for example, by changing the length in which the end portions 110B and 120B (see FIG. 3) of the antenna elements 110 and 120 overlap in the X-axis direction.
- the change in the capacitance Cg of the overlapping portion 160 on the bottom surface side of the RFID tag 100 has a relatively small influence on the resonance frequency of the RFID tag 100 when the RFID tag 100 is attached to the metal member 500.
- the change in the capacitance Cg has a relatively large influence on the resonance frequency when the RFID tag 100 is not attached to the metal member 500.
- the RFID tag 100 of Embodiment 1 by optimizing the electrostatic capacity of the overlapping portion 160, the RFID tag 100 is attached to the metal member 500, and the RFID tag 100 is attached to the metal member 500.
- the resonance frequency is matched with the state where it is not attached.
- the communicable distance of the RFID tag 100 is the longest when communication is performed at the resonance frequency.
- the RFID tag 100 allows the communicable distance in both states by matching the resonance frequencies in both the state where the RFID tag 100 is attached to the metal member 500 and the state where it is not attached. Make it as long as possible.
- an RFID tag capable of performing stable communication is provided in either a state where the RFID tag 100 is attached to the metal member 500 or a state where the RFID tag 100 is not attached.
- the RFID tag 100 As an element for changing the phase in an AC circuit, there is susceptance which is an imaginary component of admittance.
- the RFID tag 100 is an AC circuit in which an AC current at a resonance frequency flows through the loop antenna 140. For this reason, if the susceptance when the RFID tag 100 is attached to the metal member 500 and the susceptance when the RFID tag 100 is not attached to the metal member 500 are made equal, the resonance frequencies of both can be made equal.
- the capacitance of the overlapping portion 160 is set so that the susceptance when the metal member 500 is attached and the susceptance when the metal member 500 is not attached are the same. Perform optimization.
- the capacitance of the overlapping section 160 is optimized by adjusting the adjusting section 115 (see FIG. 3) of the overlapping section 160.
- the admittance of the loop antenna 140 is the admittance of the loop antenna 140 viewed from the terminal 113 and the terminal 123A.
- the susceptance of the loop antenna 140 is a susceptance included as an imaginary component in the admittance of the loop antenna 140 viewed from the terminal 113 and the terminal 123A.
- the susceptance of the loop antenna 140 when the RFID tag 100 is attached to the metal member 500 is an example of an imaginary component of the first synthetic impedance.
- the susceptance of the loop antenna 140 when the RFID tag 100 is not attached to the metal member 500 is an example of an imaginary component of the second synthetic impedance.
- the first combined impedance is the inductance of the loop antenna 140 when the RFID tag 100 is attached to the metal member 500, the electrostatic capacity between the loop antenna 140 and the metal member 500, and the electrostatic capacity of the overlapping portion 160. This is the impedance obtained from the capacitance.
- the second synthetic impedance is an impedance obtained from the inductance of the loop antenna 140 and the capacitance of the overlapping portion 160 when the RFID tag 100 is attached to a non-metallic member.
- both the first combined impedance and the second combined impedance are obtained by further adding the capacitance of the interdigital unit 170. It may be impedance.
- FIG. 11 is a diagram illustrating how to adjust the distance D between the two adjusting units 115.
- the distance D between the two adjustment units 115 is such that the Y-axis negative direction side edge 115A of the adjustment unit 115 on the Y-axis negative direction side and the Y-axis positive direction side of the adjustment unit 115 on the Y-axis positive direction side. This was done by fixing the position with the end side 115B and changing the widths of the two adjusting portions 115.
- the distance between the end sides 115A and 115B in the Y-axis direction is 3 mm.
- FIG. 12 is a diagram showing the characteristics of the susceptance B with respect to the interval D of the adjusting unit 115.
- FIG. 13 is a diagram illustrating a characteristic of the resonance frequency with respect to the interval D of the adjustment unit 115.
- FIG. 14 is a diagram illustrating a characteristic of a readable distance (Read Range) of the RFID tag 100 with respect to the frequency of the read signal. The characteristics shown in FIGS. 12 to 14 are obtained by an electromagnetic field simulator.
- the characteristics when the RFID tag 100 is attached to the metal member 500 are shown by square plots, and the characteristics when the RFID tag 100 is not attached to the metal member 500 are shown by triangular plots.
- the susceptance when the RFID tag 100 is attached to the metal member 500 and the RFID tag 100 to the metal member 500 are about 2.7 mm. Matched susceptance when not pasted.
- the resonance frequencies coincided at about 2.7 mm.
- the matched resonance frequency is about 870 MHz, and the resonance frequency can be adjusted to 865 MHz by further fine adjustment.
- the readable distance is different between when the RFID tag 100 is attached to the metal member 500 and when the RFID tag 100 is not attached to the metal member 500. This is because the apparent loop becomes larger due to the mirror image current when the film is attached to 500.
- the RFID tag 100 by optimizing the capacitance of the overlapping portion 160, the RFID tag 100 is attached to the metal member 500, and the RFID tag 100 is attached to the metal member 500. It was found that the resonance frequency can be matched with the state where it is not attached.
- the capacitance of the overlapping portion 160 is optimized by matching the susceptance when the RFID tag 100 is attached to the metal member 500 and the susceptance when the RFID tag 100 is not attached to the metal member 500. realizable.
- the communicable distance of the RFID tag 100 is the longest when communication is performed at the resonance frequency, and therefore resonance in both the state where the RFID tag 100 is attached to the metal member 500 and the state where the RFID tag 100 is not attached. By matching the frequencies, the longest communicable distance can be obtained in both states as shown in FIG.
- the susceptance when affixed to the metal member 500 and the susceptance when not affixed to the metal member 500 are made to coincide with each other, so It is possible to provide the RFID tag 100 capable of performing stable communication in any state where it is not attached.
- the distance D of the adjustment unit 115 that matches the susceptance when the metal member 500 is pasted with the susceptance when the metal member 500 is not pasted can be obtained by using an electromagnetic field simulator. This is as shown in FIGS.
- the susceptance when attached to the metal member 500 and the metal member 500 It is possible to obtain the interval D of the adjusting unit 115 that matches the susceptance when not attached to the susceptance.
- the center frequency at which both characteristics shown in FIG. May be slightly off.
- the interval of the adjustment unit 115 may be adjusted so that the center frequency at which both characteristics take peak values falls within a range of ⁇ 10%.
- the interval of the adjustment unit 115 is adjusted so that the difference between the susceptance when the metal member 500 is attached and the susceptance when the metal member 500 is not attached is within a predetermined range. become.
- the adjustment unit 115 is provided at the end 110B of the antenna element 110 .
- the adjustment unit 115 is a part of the overlapping unit 160.
- the adjusting unit 115 may not be provided.
- the adjustment unit 115 has been described as having two elongated patterns.
- the thicknesses of the two adjustment units 115 may be changed as shown in FIG. 11B, or may be one as shown in FIG.
- FIG. 15 is a diagram illustrating an example of an RFID system 800 using the RFID tag 100 according to the first embodiment.
- the RFID system 800 includes, for example, an RFID tag 100, a personal computer 50, and a reader / writer 60.
- the RFID tag 100 is attached to the metal member 500.
- the loop antenna 140 (see FIG. 1) of the RFID tag 100 is not shown.
- the reader / writer 60 is connected to the personal computer 50.
- the reader / writer 60 emits a read signal.
- the reader / writer 60 receives a signal representing an ID emitted from the RFID tag 100. Thereby, the ID of the RFID tag 100 can be identified by the personal computer 50.
- the reader / writer 60 is connected to the personal computer 50, but the reader / writer 60 may be connected to a server.
- the RFID tag 100 by optimizing the capacitance of the overlapping portion 160, the RFID tag 100 is attached to the metal member 500, and the RFID tag 100 is not attached to the metal member 500.
- the resonance frequency is matched with the state.
- both when the RFID tag 100 is attached to the metal member 500 and when the RFID tag 100 is attached to a non-metal member instead of the metal member 500 shown in FIG. The longest communicable distance can be obtained in the state.
- the RFID system 800 capable of performing stable communication in both the state of being attached to the metal member 500 and the state of being not attached.
- FIG. 16 is a diagram illustrating the RFID tag 200 according to the second embodiment.
- FIG. 17 is a diagram illustrating an inlay 250 included in the RFID tag 200 according to the second embodiment.
- the RFID tag 200 includes a base portion 101, a sheet portion 205, antenna elements 110 and 220, and an IC chip 130.
- the sheet portion 205, the antenna elements 110 and 120, and the IC chip 130 constitute an inlay 250.
- the RFID tag 200 of the second embodiment has a configuration in which an adjustment unit 215 is connected to the end 120B (see FIG. 3) of the antenna element 120 of the RFID tag 100 of the first embodiment.
- the antenna element 220 of the RFID tag 200 of the second embodiment has a configuration in which the adjustment unit 215 is connected to the end 120B (see FIG. 3) of the antenna element 120 of the first embodiment.
- the adjustment part 215 is an example of a 2nd protrusion part.
- the adjusting unit 215 is connected to the end 220B of the antenna element 220.
- the configuration of the adjustment unit 215 is the same as that of the adjustment unit 115.
- the sheet unit 205 is longer than the sheet unit 105 of the first embodiment.
- the antenna elements 110 and 220 construct a loop antenna 240.
- the susceptance when affixed to the metal member 500 and the susceptance when not affixed to the metal member 500 are matched with each other so that the state affixed to the metal member 500 is affixed. It is possible to provide the RFID tag 200 capable of performing stable communication in any state of no state.
- the RFID tag 200 according to the second embodiment includes the adjustment unit 215, the range in which the resonance frequency can be adjusted between the state of being attached to the metal member 500 and the state of being not attached is further expanded.
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Abstract
Description
導体を備える無線タグがある。この無線タグは、さらに、第2曲面を形成し、前記第2曲面内の第3端部に、前記第2端子と接続される第4端子を有し、前記第2曲面内で前記第3端部と反対側の第4端部に、第2領域を有し、前記第1領域と前記第2領域が互いに平行に重なり、前記第1曲面と前記第2曲面がループアンテナを形成する、第2導体を備える(例えば、特許文献1参照)。
図1は、実施の形態1のRFIDタグ100を示す図である。
図16は、実施の形態2のRFIDタグ200を示す図である。図17は、実施の形態2のRFIDタグ200に含まれるインレイ250を示す図である。
101 ベース部
105、205 シート部
110、120、220 アンテナエレメント
111 エレメント
112、114 突出部
115 調整部
121 エレメント
122、123、124 突出部
130 ICチップ
140、240 ループアンテナ
150、250 インレイ
160 重複部
170 インターデジタル部
Claims (13)
- 誘電体製で板状のベース部と、
前記ベース部の周囲に形成される、第1アンテナエレメント及び第2アンテナエレメントを備え、共振周波数における波長よりも短いループ長を有するループアンテナと、
前記ベース部の第1面側に配設され、前記第1アンテナエレメントの一端側に設けられる第1端子と、前記第2アンテナエレメントの一端側に設けられる第2端子との間に接続されるICチップと
を含み、
前記ループアンテナは、前記ベース部の前記第1面とは反対側の第2面側に、第1アンテナエレメントの他端側の第1端部と、前記第2アンテナエレメントの他端側の第2端部とが互いに絶縁された状態で重なり合う重複部を有し、
前記重複部の静電容量は、
前記ベース部の前記第2面側を金属部材に貼り付ける場合の前記ループアンテナのインダクタンスと、前記ループアンテナと前記金属部材との間の静電容量と、前記重複部の静電容量とで得られる、前記第1端子及び前記第2端子から見た第1合成インピーダンスの虚数成分と、
前記ベース部の前記第2面側を非金属部材に貼り付ける場合の前記ループアンテナのインダクタンスと、前記重複部の静電容量とで得られる、前記第1端子及び前記第2端子から見た第2合成インピーダンスの虚数成分と
の差が所定差以下になるように調整される、RFIDタグ。 - 前記重複部の静電容量は、前記第1合成インピーダンスの虚数成分と、前記第2合成インピーダンスの虚数成分とが一致するように調整される、請求項1記載のRFIDタグ。
- 前記ループアンテナの第1アンテナエレメント及び第2アンテナエレメントが形成されるシート部材をさらに含み、
前記ループアンテナは、前記シート部材が前記ベース部の周囲に巻回されることにより、前記ベース部の周囲に形成される、請求項1又は2記載のRFIDタグ。 - 前記第1アンテナエレメント及び第2アンテナエレメントと、前記シート部材とは、インレイを構築する、請求項3記載のRFIDタグ。
- 前記第1アンテナエレメントは、前記第1端部の幅より狭く、前記第1端部から前記ループアンテナの長手方向に突出する第1突出部を有する、請求項1乃至4のいずれか一項記載のRFIDタグ。
- 前記第1突出部は、前記第1端部の幅方向において、前記第1端部よりも当該幅方向の中央部にオフセットしている、請求項5記載のRFIDタグ。
- 前記第1アンテナエレメントは、前記第1突出部を2本有する、請求項5又は6記載のRFIDタグ。
- 前記第2アンテナエレメントは、前記第2端部の幅より狭く、前記第2端部から前記ループアンテナの長手方向に突出する第2突出部を有する、請求項1乃至7のいずれか一項記載のRFIDタグ。
- 前記第2突出部は、前記第2端部の幅方向において、前記第2端部よりも当該幅方向の中央部にオフセットしている、請求項8記載のRFIDタグ。
- 前記第2アンテナエレメントは、前記第2突出部を2本有する、請求項8又は9記載のRFIDタグ。
- 前記第1アンテナエレメントの前記一端、又は、前記第2アンテナエレメントの前記一端と、前記第1端部又は前記第2端部とは、平面視で重複する、請求項1乃至10のいずれか一項記載のRFIDタグ。
- 前記ループアンテナは、前記第1アンテナエレメントの前記一端側と、前記第2アンテナエレメントの前記一端側とに配設される、インターデジタル部を有する、請求項1乃至11のいずれか一項記載のRFIDタグ。
- RFIDタグと、前記RFIDタグとの間で通信を行うリーダライタとを含むRFIDシステムであって、
前記RFIDタグは、
誘電体製で板状のベース部と、
前記ベース部の周囲に形成される、第1アンテナエレメント及び第2アンテナエレメントを備え、共振周波数における波長よりも短いループ長を有するループアンテナと、
前記ベース部の第1面側に配設され、前記第1アンテナエレメントの一端側に設けられる第1端子と、前記第2アンテナエレメントの一端側に設けられる第2端子との間に接続されるICチップと
を含み、
前記ループアンテナは、前記ベース部の前記第1面とは反対側の第2面側に、第1アンテナエレメントの他端側の第1端部と、前記第2アンテナエレメントの他端側の第2端部とが互いに絶縁された状態で重なり合う重複部を有し、
前記重複部の静電容量は、
前記ベース部の前記第2面側を金属部材に貼り付ける場合の前記ループアンテナのインダクタンスと、前記ループアンテナと前記金属部材との間の静電容量と、前記重複部の静電容量とで得られる、前記第1端子及び前記第2端子から見た第1合成インピーダンスの虚数成分と、
前記ベース部の前記第2面側を非金属部材に貼り付ける場合の前記ループアンテナのインダクタンスと、前記重複部の静電容量とで得られる、前記第1端子及び前記第2端子から見た第2合成インピーダンスの虚数成分と
の差が所定差以下になるように調整される、RFIDシステム。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN201380078534.XA CN105408918B (zh) | 2013-07-31 | 2013-07-31 | Rfid标签、以及rfid系统 |
JP2015529278A JP6061035B2 (ja) | 2013-07-31 | 2013-07-31 | Rfidタグ、及び、rfidシステム |
EP13890425.5A EP3029610B1 (en) | 2013-07-31 | 2013-07-31 | Rfid tag and rfid system |
PCT/JP2013/070792 WO2015015604A1 (ja) | 2013-07-31 | 2013-07-31 | Rfidタグ、及び、rfidシステム |
US15/003,425 US9703997B2 (en) | 2013-07-31 | 2016-01-21 | RFID tag and RFID system |
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PCT/JP2013/070792 WO2015015604A1 (ja) | 2013-07-31 | 2013-07-31 | Rfidタグ、及び、rfidシステム |
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US15/003,425 Continuation US9703997B2 (en) | 2013-07-31 | 2016-01-21 | RFID tag and RFID system |
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WO2015015604A1 true WO2015015604A1 (ja) | 2015-02-05 |
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US (1) | US9703997B2 (ja) |
EP (1) | EP3029610B1 (ja) |
JP (1) | JP6061035B2 (ja) |
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CN109820569A (zh) * | 2019-03-19 | 2019-05-31 | 成都信息工程大学 | 一种具有电子标签的手术剪 |
WO2024075325A1 (ja) * | 2022-10-03 | 2024-04-11 | 株式会社フェニックスソリューション | Rfタグ用アンテナ及びrfタグ |
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CN106602218B (zh) * | 2017-01-24 | 2024-05-10 | 国网冀北电力有限公司电力科学研究院 | 一种抗金属表面的有源射频识别标签天线 |
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EP3029610B1 (en) | 2017-07-12 |
US20160140368A1 (en) | 2016-05-19 |
EP3029610A4 (en) | 2016-07-20 |
JP6061035B2 (ja) | 2017-01-18 |
CN105408918B (zh) | 2018-07-10 |
US9703997B2 (en) | 2017-07-11 |
EP3029610A1 (en) | 2016-06-08 |
CN105408918A (zh) | 2016-03-16 |
JPWO2015015604A1 (ja) | 2017-03-02 |
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