WO2022191258A1 - Rfid tag and rfid tag manufacturing method - Google Patents

Rfid tag and rfid tag manufacturing method Download PDF

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Publication number
WO2022191258A1
WO2022191258A1 PCT/JP2022/010424 JP2022010424W WO2022191258A1 WO 2022191258 A1 WO2022191258 A1 WO 2022191258A1 JP 2022010424 W JP2022010424 W JP 2022010424W WO 2022191258 A1 WO2022191258 A1 WO 2022191258A1
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WO
WIPO (PCT)
Prior art keywords
rfid tag
magnetic sheet
slot
inlay
slot antenna
Prior art date
Application number
PCT/JP2022/010424
Other languages
French (fr)
Japanese (ja)
Inventor
卓朗 嶋田
エリナ 菅
武 菅
仁 中根
Original Assignee
大王製紙株式会社
藤倉化成株式会社
大同産業株式会社
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Publication date
Application filed by 大王製紙株式会社, 藤倉化成株式会社, 大同産業株式会社 filed Critical 大王製紙株式会社
Publication of WO2022191258A1 publication Critical patent/WO2022191258A1/en

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems

Definitions

  • the present disclosure relates to RFID tags and RFID tag manufacturing methods.
  • RFID Radio Frequency Identification
  • An RFID tag includes an IC chip and an antenna electrically connected to the IC chip.
  • RFID tags are also called wireless tags, IC tags, RF-ID tags, and RF tags.
  • the object to which such an RFID tag is attached is made of metal, communication by the antenna inside the tag may not be possible, which may hinder reading of the identification information. This is because if there is metal around the RFID tag, the electromagnetic wave sent from the reader/writer that transmits and receives data to the RFID tag is lost as eddy current in the metal part, so the data is sent back from the IC chip to the antenna again. It is presumed that the cause is that the energy for this is not obtained efficiently.
  • the frequency band used for RFID tag communication is the UHF band (radio wave method), which enables long-distance communication and batch reading of multiple objects compared to the HF band (13.56 MHz, electromagnetic induction method). Needs are growing. However, there is a possibility that communication cannot be performed in the UHF band with a conventional configuration in which a magnetic sheet is sandwiched between an RFID tag and metal.
  • An object of the present disclosure is to provide an RFID tag capable of improving communication performance and a method for manufacturing the RFID tag.
  • An RFID tag is an RFID tag attached to an object to be attached, and has an IC chip on which identification information is recorded and a slot antenna connected to the IC chip.
  • the magnetic sheet is provided with a slit that separates a magnetic layer having magnetic properties, and the slit is a region that overlaps the slot of the inlay in a state in which the magnetic sheet and the inlay are laminated. placed in
  • a method for manufacturing an RFID tag includes the steps of forming a magnetic sheet provided with slits for separating a magnetic layer having magnetic properties, and an IC chip on which identification information is recorded. a slot antenna connected to the IC chip; and a step of stacking the magnetic sheets formed in the forming step, wherein the slot antenna is formed of a metal thin film, and the slot antenna is formed of a metal thin film.
  • the antenna is provided with a slot obtained by cutting out a part of the metal thin film in a long and narrow shape, and the slit is arranged in a region overlapping the slot of the inlay in a state in which the magnetic sheet and the inlay are laminated.
  • an RFID tag capable of improving communication performance and a method for manufacturing an RFID tag.
  • FIG. 2 is an exploded perspective view of the RFID tag shown in FIG.
  • FIG. 2 is a plan view of the RFID tag shown in FIG. 1 as viewed from above;
  • FIG. 4 is a diagram showing the dimensions of each part of the slot antenna and the slot used in the first embodiment;
  • FIG. 4 shows frequency characteristics of RFID tags of Examples 1 to 5 and Comparative Example 2;
  • FIG. 10 is a diagram showing frequency characteristics of RFID tags of Examples 6 to 9; The figure which shows the shape of the slot antenna used in Example 14.
  • FIG. 4 is a diagram showing the dimensions of each part of the slot antenna and the slot used in the first embodiment;
  • FIG. 4 shows frequency characteristics of RFID tags of Examples 1 to 5 and Comparative Example 2;
  • FIG. 10 is a diagram showing frequency characteristics of RFID tags of Examples 6 to 9; The figure which shows the shape of the slot antenna used in Example 14.
  • FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 14; The figure which shows the shape of the slot antenna used in Example 15.
  • FIG. 15 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 15; The figure which shows the shape of the slot antenna used in Example 16.
  • FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 16; The figure which shows the shape of the slot antenna used in Example 17.
  • FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 17; The figure which shows the shape of the slot antenna used in Example 18.
  • FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 18; The figure which shows the shape of the slot antenna used in Example 19.
  • FIG. 19 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 19; Stacked sectional view of an RFID tag according to a modified example
  • FIG. 4 is a diagram showing an example of characteristics for each metal type of the RFID
  • the x-direction, y-direction, and z-direction are directions perpendicular to each other.
  • the x-direction is the longitudinal direction of the inlay 101 and the magnetic sheet 102 and the extending direction of the parallel portion 22 of the slot 21 and the slit 30 .
  • the y direction is the lateral direction of the inlay 101 and the magnetic sheet 102 and the extending direction of the vertical portion 23 of the slot 21 .
  • the z-direction is the stacking direction of each component of the RFID tag 100 such as the inlay 101 and the magnetic sheet 102 .
  • the positive z direction side may also be referred to as the upper side
  • the negative z direction side may also be referred to as the lower side.
  • FIG. 1 is a laminated cross-sectional view of the RFID tag 100 according to the embodiment.
  • FIG. 2 is an exploded perspective view of the RFID tag 100 shown in FIG.
  • FIG. 3 is a top plan view of the RFID tag 100 shown in FIG.
  • the RFID tag 100 is a substantially planar device that is attached to an attachment target 200 .
  • the RFID tag comprises an inlay 101, a magnetic sheet 102 and a dielectric layer 103.
  • the sticking target 200 is, for example, metal.
  • Metals include metals such as iron, aluminum, and copper, as well as metal alloys such as iron alloys, aluminum alloys, and copper alloys.
  • the object 200 to be affixed includes materials other than metal, such as plastics, paper, and ceramics.
  • the main application of the RFID tag 100 according to the embodiment is to attach it to relatively large metal products such as drums and H steel, and to manage the inventory of each of these metal products. Can be used for tracking (traceability). In addition to metal products, the tag of this case may be attached and used.
  • the RFID tag of this embodiment is flexible and can be attached even if the surface of the adherend is curved. Good communication performance can be exhibited even when bent into a curved shape, and the RFID tag of the present embodiment can be used to identify articles with curved surfaces such as drums and spray cans, thus diversifying the applications. can be planned.
  • the inlay 101 is a part including elements related to the function of the RFID tag 100, and as shown in FIGS. have
  • the slot antenna 20 is made of a metal thin film.
  • the slot antenna 20 is provided with a slot 21 obtained by cutting out a part of the thin metal film.
  • the inlay 101 has a slot antenna 20 formed by dry laminating an aluminum sheet on a PET film, for example, and an IC chip 10 is mounted at a prescribed position.
  • the IC chip 10 is arranged in the center of the main surface of the inlay 101, and the slot 21 of the slot antenna 20 is a pair extending in parallel in a predetermined direction (the x direction in the examples of FIGS. 2 and 3) with the IC chip 10 interposed therebetween. and a pair of vertical portions 23 extending in a direction orthogonal to the pair of parallel portions 22 (y-direction).
  • the pair of vertical portions 23 are arranged at approximately equal intervals in the x direction with the IC chip 10 interposed therebetween.
  • the impedance frequency characteristics of the IC chip 10 are as follows. ⁇ 866MHz: 15-j265 ( ⁇ ) ⁇ 915MHz: 14-j252 ( ⁇ ) ⁇ 953MHz: 13-j242 ( ⁇ )
  • the impedance of the slot antenna 20 is designed to match the impedance of the IC chip 10 at 915-920 MHz. Such impedance matching reduces current loss, and the reduced loss increases the communicable distance.
  • the magnetic sheet 102 is a sheet material containing a magnetic material, and is laminated on the inlay 101 on the sticking object 200 side.
  • the magnetic sheet 102 is formed by, for example, kneading magnetic powder such as a stainless steel alloy into a rubber material, resin, or the like so as to uniformly and oriented and disperse the powder.
  • the magnetic sheet 102 is provided with slits 30 that separate the magnetic layers having magnetic properties.
  • the slit 30 is arranged in a region overlapping the slot 21 of the inlay 101 in a state in which the magnetic sheet 102 and the inlay 101 are laminated.
  • the slit 30 is formed at the center position of the magnetic sheet 102 in the y direction so as to extend along the x direction.
  • the slots 21 of the slot antenna 20 and the slits 30 of the magnetic sheet 102 are arranged such that at least a pair of parallel portions 22 of the slots 21 are entirely included in the area of the slits 30, as shown in FIG. placed in
  • the magnetic sheet 102 it is preferable to use a material having excellent magnetic shielding properties against radio waves in the UHF band.
  • the magnetic sheet 102 is obtained by coating a support with a magnetic paint containing components such as a magnetic filler and a binder resin and drying the paint.
  • the film thickness of the magnetic sheet 102 after drying is preferably 500 ⁇ m or less, more preferably 300 ⁇ m or less.
  • magnetic paint is applied.
  • the magnetic paint is applied so that the film thickness of the magnetic sheet 102 after drying is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or less.
  • the loss coefficient tan ⁇ ( ⁇ ′/ ⁇ ′′) is preferably 0.3 or less, more preferably 0.28 or less. Further, the loss coefficient tan ⁇ ( ⁇ ′/ ⁇ ′′) of the complex relative magnetic permeability in the frequency band of 860 to 960 MHz of the magnetic sheet is preferably 0.05 or more, more preferably 0.1 or more.
  • the thickness of the tag (excluding the release paper) in this embodiment is 200 ⁇ m to 1000 ⁇ m, preferably 300 to 400 ⁇ m.
  • the thickness of the magnetic sheet and the inlay in a state of being laminated (excluding label paper and release paper) is 150 to 250 ⁇ m, preferably 190 to 210 ⁇ m, more preferably about 200 ⁇ m.
  • the thickness of the label paper is 50 ⁇ m to 300 ⁇ m including the adhesive layer.
  • the thickness of the release paper is 50 ⁇ m to 300 ⁇ m.
  • the real part ⁇ ′ of the complex relative permeability of the magnetic sheet in the frequency band of 860 to 960 MHz is preferably is 5.0 or more, more preferably 5.2 or more. Further, the real part ⁇ ′ of the complex relative permeability of the magnetic sheet in the frequency band of 860 to 960 MHz is preferably 7.0 or less, more preferably 6.0 or less.
  • the material of the magnetic filler contained in the magnetic paint is preferably an Fe--Cr alloy.
  • the mass ratio of the solid content of the magnetic filler and the binder is preferably 70/30 or more, more preferably 75/25 or more, and 80/20. It is more preferable that it is above.
  • the mass ratio of the solid content of the magnetic filler and the binder is preferably 95/5 or less, more preferably 90/10 or less, and 85/ It is more preferably 15 or less.
  • the binder resin contained in the magnetic paint is one or more resins selected from the group consisting of epoxy resins, urethane resins, and polyester resins, preferably epoxy resins.
  • the dielectric layer 103 is further laminated on the attachment target 200 side of the magnetic sheet 102 and arranged between the magnetic sheet 102 and the attachment target 200 .
  • dielectric layer 103 is shown integrally beneath magnetic sheet 102 .
  • the dielectric layer 103 is preferably formed of an insulator such as a woven fabric or non-woven fabric made of fiber such as cardboard or synthetic resin, or a sheet of an inorganic material such as ceramic glass.
  • the dielectric layer 103 is made of foamed PET, for example.
  • the material of the dielectric layer 103 preferably has a dielectric constant of about 1.2 to 3.0, so that the communication distance of the RFID tag 100 can be increased.
  • the dielectric layer 103 also functions as a spacer that separates the inlay 101 and the magnetic sheet 102 from the attachment target 200 by the thickness thereof.
  • the dielectric layer 103 is made of a material that can be arbitrarily deformed together with the inlay 101 and the magnetic sheet 102 in response to an external force. , is preferably configured to improve versatility.
  • an adhesive layer 104 is arranged between the inlay 101 and the magnetic sheet 102 (not shown in FIG. 1). During lamination, the adhesive layer 104 can enter the gap formed by the slit 30 of the magnetic sheet 102 and the dielectric layer 103 therebelow to fill the gap.
  • a label paper (film-based tack paper) 105 is further arranged above the inlay 101 .
  • the label paper 105 can be printed on the surface in the positive z direction.
  • the material of the label paper can be appropriately selected.
  • an adhesive 106 is applied to the back surface of the label paper 105 on the negative z direction side.
  • the label paper 105 is formed larger than the inlay 101, the magnetic sheet 102, and the dielectric layer 103, and as shown in FIG. is formed to surround the outer edge portion 105A. Accordingly, as shown in FIG. 1, when the RFID tag 100 is attached to the attachment target 200, the outer sides of the inlay 101, the magnetic sheet 102, and the dielectric layer 103 are completely covered with the label paper 105. The outer edge portion 105A of the contact with the application target 200 . That is, the entire RFID tag 100 is attached to the attachment target 200 by the adhesive 106 on the outer edge portion 105A of the label paper 105 .
  • an adhesive can be used, for example, in a usage environment in which it is used for a long period of time. However, once the adhesive has cured, it may become difficult to remove.
  • the adhesive usually allows the RFID tag to be peeled off from the target article manually by an operator, etc., and depending on the type of adhesive, the RFID tag can be re-attached after peeling, and the RFID tag can be used. May be reusable.
  • the adhesive is not applied between the dielectric layer 103 and the attachment target 200, and the dielectric layer 103 does not have to be adhered (adhered) to the sticking object 200 .
  • a release paper 107 is arranged below the dielectric layer 103 on the RFID tag 100 before use.
  • the release paper 107 is, for example, formed to have a size equal to or larger than that of the label paper 105, and the label paper 105 and the release paper 107 are adhered to each other by the adhesive 106 on the outer edge portion.
  • the adhesive 106 on the outer edge portion 105A of the label paper 105 can be prevented from being exposed to the outside before being used for attachment to the attachment target 200, and the adhesive strength can be maintained.
  • the release paper 107 is peeled off from the RFID tag 100 , and the exposed adhesive 106 of the label paper 105 sticks the RFID tag 100 to the sticking object 200 .
  • the release paper 107 may be formed larger than the one illustrated in FIG. As a result, manufacturing efficiency and transport efficiency can be improved.
  • the release paper 107 is attached to an area of 50% or more of the area of the RFID tag 100 .
  • a plurality of RFID tags 100 are arranged on a release paper 107 extending in one direction, and the release paper 107 including the RFID tags 100 is rolled.
  • the roll-shaped release paper 107 is pulled out and the printing process is applied to each RFID tag 100.
  • the roll-shaped release paper 107 is re-rolled and stored. This is to prevent the RFID tag 100 from detaching from the roll-shaped release paper 107 in such a manufacturing process and a printing process.
  • FIG. 21 is a lamination cross-sectional view of an RFID tag 100A according to a modification.
  • the label paper 105 may have the same size as the inlay 101, the magnetic sheet 102, and the dielectric layer 103.
  • the adhesive 106 is applied to the lower surface of the dielectric layer 103 facing the object 200 to be adhered, so that the dielectric layer 103 adheres to the object 200 to be adhered.
  • the entire RFID tag 100A is attached to the attachment target 200 by being adhered.
  • FIG. 4 is a plan view showing an example of another shaped slot 21A of the slot antenna 20. As shown in FIG.
  • the shape of the slot of the slot antenna 20 may be a shape having only a pair of parallel portions 22A and no vertical portion, such as the slot 21A shown in FIG. 4, for example.
  • the parallel portion 22A has an opening area larger than that of the parallel portion 22 in FIG. 3 toward the extending direction of the vertical portion 23 in FIG. 3 and a width in the y direction.
  • the width of the slit 30 is formed wide so that the region of the slit 30 includes the pair of parallel portions 22A of the slot 21A.
  • FIG. 5 is a flow chart showing an example of a method for manufacturing the RFID tag 100 according to the embodiment.
  • step S1 a magnetic sheet 102 (slit magnetic sheet) provided with slits 30 separating magnetic layers having magnetic properties is formed.
  • Such a slitted magnetic sheet 102 is formed on a polyester synthetic film (manufactured by Toyobo Co., Ltd., "Crisper K1211 #38 ⁇ ") at a speed of 3 m/min by, for example, a roll-to-roll method.
  • a striped pattern is formed by using a magnetic shield paint using a coater, and the magnetic shield paint is passed through a curing furnace of 30 m while raising the temperature from 40°C to 80°C.
  • step S2 the slitted magnetic sheet 102 formed in step S1 and the inlay 101 are laminated.
  • the slits 30 provided in the magnetic sheet 102 in step S1 are formed so as to be arranged in a region overlapping the slots 21 of the inlay 101 in a state in which the magnetic sheet 102 and the inlay 101 are laminated in step S2.
  • step S3 the dielectric layer 103 is laminated on the surface of the magnetic sheet 102 opposite to the inlay 101.
  • steps S2 and S3 may be reversed to laminate the inlay 101 and the magnetic sheet 102 after the magnetic sheet 102 and the dielectric layer 103 are laminated.
  • step S4 a film-based tack paper (label paper) 105 is laminated on the surface of the inlay 101 opposite to the magnetic sheet 102 .
  • the RFID tag 100 includes an inlay 101 having an IC chip 10 on which identification information is recorded, a slot antenna 20 connected to the IC chip 10, and an object 200 to which the inlay 101 is attached. and a magnetic sheet 102 laminated on the side.
  • the slot antenna 20 is formed of a metal thin film, and the slot antenna 20 is provided with a slot 21 formed by cutting out a part of the metal thin film.
  • the magnetic sheet 102 is provided with slits 30 that separate the magnetic layers having magnetic properties. This slit 30 is arranged in a region overlapping the slot 21 of the inlay 101 in a state in which the magnetic sheet 102 and the inlay 101 are laminated.
  • the slit 30 in the magnetic sheet 102 in this way, it is possible to increase the communicable distance of the RFID tag 100 in the UHF band regardless of the type of the object 200 to be attached, and improve the communication performance (Fig. 22).
  • long-distance communication and batch reading of a plurality of objects are possible, and the communicable distance of the UHF band can be increased.
  • the conventional RFID tag cannot communicate with the antenna in the tag, which may hinder the reading of the identification information.
  • the effect of being able to improve the performance is particularly remarkable when the sticking target 200 is made of metal.
  • the overall thickness of the RFID tag is 3.5 mm or more in order to secure the interval, and it is difficult to reduce the thickness of the RFID tag.
  • the thickness of the RFID tag of this embodiment is 1 mm or less, and can be made thinner than conventional RFID tags that do not use a magnetic sheet.
  • the thickness of the RFID tag including the label paper and the release paper can be about 350 ⁇ m, and the thickness can be significantly reduced as a metal-compatible RFID tag.
  • the dielectric layer 103 further laminated on the attachment target 200 side of the magnetic sheet 102 can further increase the communicable distance in the UHF band. can be further improved.
  • the RFID tag 100 can be applied to both electromagnetic induction wireless tags and radio wave wireless tags.
  • a predetermined wireless communication distance with a reader can be secured.
  • the predetermined wireless communication distance ranges, for example, from 0m to 20m.
  • the RFID tag 100 can be applied not only to radio waves in the UHF band, but also to radio waves in the VHF band, SHF band, and the like.
  • the frequency used by the RFID tag 100 is a UHF band frequency, such as 860 to 960 MHz, 915 to 925 MHz, etc.
  • the UHF band has a higher frequency than the VHF band, so the wavelength becomes shorter, which is advantageous for miniaturizing the antenna. is. Therefore, by forming the RFID tag 100 into a shape suitable for radio waves in the UHF band, the size of the IC chip 10 can be reduced, and an inexpensive wireless tag with a small memory capacity can be obtained.
  • Examples 1 to 5 and Comparative Examples 1 and 2 were set as follows, and the effect on communication performance according to the change in the width of the slit 30 of the magnetic sheet 102 was verified.
  • Example 1 An inlay 101, a magnetic sheet 102 with a thickness of 100 ⁇ m, and a dielectric layer 103 made of foamed PET with a thickness of 38 ⁇ m were laminated to produce the RFID tag 100 shown in FIG.
  • a slot antenna 20 was formed by sticking a 10 ⁇ m aluminum sheet on a 38 ⁇ m thick PET film by dry lamination, and an IC chip 10 was mounted at a prescribed position.
  • the label paper 105 was removed.
  • the antenna pattern of the slot 21 of the slot antenna 20 has the shape shown in FIG. The dimensions of each part of the slot antenna 20 and slot 21 are shown in FIG.
  • the magnetic sheet 102 was prepared by the following procedure.
  • the magnetic paint consists of 55.2 parts by mass of Fe--Cr alloy (manufactured by Sanyo Special Steel Co., Ltd., "FKTE231”) as a magnetic filler, and polyester-based polyurethane (manufactured by Arakawa Chemical Industries, Ltd., "Uriano 2456”) as a binder resin.
  • Average molecular weight 30000 9.9 parts by mass, 22.6 parts by mass of toluene as an organic solvent, 0.4 parts by mass of a phosphate polyester dispersant (manufactured by BYK Chemie Japan Co., Ltd., "BYK-111") as a dispersant, and , and 0.2 parts by mass of a non-silicone antifoaming agent (“BYK-1752” manufactured by BYK Chemie Japan Co., Ltd.) as an antifoaming agent.
  • a phosphate polyester dispersant manufactured by BYK Chemie Japan Co., Ltd.
  • BYK-111 phosphate polyester dispersant
  • BYK-1752 non-silicone antifoaming agent
  • the slit 30 of the magnetic sheet 102 was formed to have a width of 2 mm in the y direction with the center of the magnetic sheet 102 in the y direction as the center position in the width direction, as shown in FIG.
  • the frequency characteristics of the RFID tag 100 were measured using an RFID tag performance inspection device (Tagformance Pro, manufactured by Voyantic) in a state in which the RFID tag 100 thus produced was attached to the attachment target 200 of the SUS plate.
  • the measurement frequency band of radio waves for wireless communication during measurement was set to 700 to 1200 MHz, and EIRP (Equivalent Isotropically Radiated Power) was set to 3.28W.
  • Example 2 The RFID tag 100 was produced in the same manner as in Example 1 except that the width of the slit 30 of the magnetic sheet 102 was set to 5 mm, and the frequency characteristics were measured.
  • Example 3 The RFID tag 100 was produced in the same manner as in Example 1, except that the width of the slit 30 of the magnetic sheet 102 was set to 10 mm, and the frequency characteristics were measured.
  • Example 4 The RFID tag 100 was produced in the same manner as in Example 1, except that the width of the slit 30 of the magnetic sheet 102 was 18 mm, and the frequency characteristics were measured.
  • Example 5 The RFID tag 100 was produced in the same manner as in Example 1, except that the width of the slit 30 of the magnetic sheet 102 was set to 25 mm, and the frequency characteristics were measured.
  • the RFID tag 100 was produced in the same manner as in Example 1, except that the magnetic sheet 102 was not provided with the slit 30, and the frequency characteristics were measured.
  • An RFID tag 100 was produced in the same manner as in Example 1, except that the magnetic sheet 102 was omitted. That is, an RFID tag was produced by laminating an inlay 101 and a dielectric layer 103 having a thickness of 38 ⁇ m. Further, the frequency characteristics of the produced RFID tag were measured in the same manner as in the first embodiment.
  • FIG. 7 is a diagram showing frequency characteristics of RFID tags of Examples 1 to 5 and Comparative Example 2.
  • FIG. 7 (A) is Example 1, (B) is Example 2, (C) is Example 3, (D) is Example 4, (E) is Example 5, and (F) is a comparative example. 2 shows the frequency characteristics of FIG.
  • the horizontal axis represents the frequency of radio waves for wireless communication
  • the vertical axis represents the communicable distance from the RFID tag 100 to the reader.
  • wireless communication could not be performed between the RFID tag 100 and the reader.
  • wireless communication could not be performed in the frequency band of about 870 MHz or less.
  • wireless communication could not be performed in all frequency bands.
  • the communicable distance at a predetermined frequency of 920 MHz included in the UHF band is about 2.0 m in Example 1, about 3 m in Example 2, and about 4.5 m in Example 3.
  • Example 4 was about 4.5 m
  • Example 5 was about 2.5 m
  • Comparative Example 2 was about 1.5 m.
  • the communicable distance also increases.
  • the maximum communicable distance is about 4.5m.
  • the peak position of the frequency characteristics is included in the range of 860 to 960 MHz, which is the frequency of the UHF band.
  • Example 5 shown in FIG. 7(E) when the slit width was further increased, the peak position of the frequency characteristics moved to the high frequency side, and the communicable distance in the UHF band (for example, around 920 MHz) slightly decreased.
  • the communicable distance can be increased, and in particular, the communicable distance in the UHF band can be increased. shown that it can be done.
  • the communicable distance can be maximized by setting the width of the slit 30 to 10 to 18 mm.
  • the width of the slit 30 has an optimum range.
  • Examples 6 to 9 were set as follows, and the magnetic properties of the magnetic sheet 102, specifically, the influence on the communication performance according to the change in the ratio of the magnetic powder was verified.
  • Example 6 The width of the magnetic sheet 102 was set to 18 mm, which is within the optimum range among Examples 1 to 5 above.
  • the magnetic layer 102A of the magnetic sheet 102 has a magnetic powder ratio of 100% and a dielectric powder ratio of 0%.
  • the RFID tag 100 was produced under the same conditions as in Example 1 above, and the frequency characteristics were measured.
  • Example 7 An RFID tag 100 was produced in the same manner as in Example 6 except that the magnetic layer 102A of the magnetic sheet 102 had a magnetic powder ratio of 70% and a dielectric powder ratio of 30%, and the frequency characteristics were measured. did.
  • Example 8 The RFID tag 100 was produced in the same manner as in Example 6 except that the magnetic layer 102A of the magnetic sheet 102 had a magnetic powder ratio of 30% and a dielectric powder ratio of 70%, and the frequency characteristics were measured. did.
  • Example 9 An RFID tag 100 was produced in the same manner as in Example 6 except that the magnetic layer 102A of the magnetic sheet 102 had a magnetic powder ratio of 0% and a dielectric powder ratio of 100%, and the frequency characteristics were measured. did.
  • FIG. 8 is a diagram showing frequency characteristics of RFID tags of Examples 6 to 9.
  • FIG. 8 (A) shows the frequency characteristics of the sixth embodiment, (B) the seventh embodiment, (C) the eighth embodiment, and (D) the ninth embodiment. The outline of each figure is the same as that of FIG.
  • the communicable distance at a predetermined frequency of 920 MHz included in the UHF band is about 4.5 m in Example 6, about 3.5 m in Example 7, and about 2.5 m in Example 8. , and about 1.8 m in Example 9. Further, the position of the peak of the frequency characteristics is about 900 to 960 MHz in Example 6, about 940 to 1025 MHz in Example 7, about 1010 to 1060 MHz in Example 8, and about 1010 MHz in Example 9. Met.
  • Examples 10 to 13 were set as follows, and the influence on communication performance depending on the presence or absence of the dielectric layer 103 was verified.
  • Example 10 As in Example 5 above, the RFID tag 100 was produced by setting the width of the slit 30 of the magnetic sheet 102 to 25 mm and the thickness of the magnetic sheet 102 to 100 ⁇ m. The produced RFID tag 100 was attached to a steel locker, and the communicable distance was measured using an off-the-shelf handy reader (trade name: AsReaderGUN, manufactured by Asterisk, output 1 W).
  • AsReaderGUN manufactured by Asterisk
  • Example 11 The RFID tag 100 was produced in the same manner as in Example 10, except that the dielectric layer 103 was omitted, and the frequency characteristics were measured.
  • Example 12 The RFID tag 100 was produced in the same manner as in Example 10, except that the thickness of the magnetic sheet 102 was 200 ⁇ m, and the frequency characteristics were measured.
  • Example 13 The RFID tag 100 was produced in the same manner as in Example 12, except that the dielectric layer 103 was omitted, and the frequency characteristics were measured.
  • Table 1 shows the measurement results of the communication distances of the RFID tags of Examples 10-13.
  • Example 10 provided with the dielectric layer 103 can increase the communicable distance. Moreover, even in the twelfth and thirteenth embodiments in which the thickness of the magnetic sheet 102 is 200 ⁇ m, the twelfth embodiment having the dielectric layer 103 can increase the communicable distance. From the above, it was shown that the communication performance can be improved by providing the dielectric layer 103 to the RFID tag regardless of the change in the thickness of the magnetic sheet 102 .
  • Examples 14 to 19 were set as follows, and the effect on communication performance according to the change in the shape of the slot antenna 20 was verified. Specifically, the shape of the slot antenna 20 was changed using a simulator, and changes in impedance were confirmed.
  • FIG. 9 is a diagram showing the shape of the slot antenna 20-1 used in the fourteenth embodiment.
  • a model of the slot antenna 20-1 having the shape shown in FIG. 9 was created on the simulator.
  • the shape and dimensions of each part of the slot antenna 20-1 shown in FIG. 9 are the same as those of the slot antenna 20 formed in Example 1 shown in FIG.
  • the impedance was measured on a simulator.
  • FIG. 10 is a diagram showing the measurement results of the impedance characteristics of the slot antenna 20-1 of Example 14.
  • FIG. The vertical axis in FIG. 10 indicates the values of real and imaginary impedances.
  • the horizontal axis of FIG. 10 indicates frequency [MHz].
  • the dashed-dotted line graph (plotted with circles) shown in FIG. 10 plots the real number of the impedance corresponding to each frequency.
  • the solid-line graph (graph with square plots) shown in FIG. 10 plots the imaginary number of the impedance corresponding to each frequency.
  • FIG. 11 is a diagram showing the shape of the slot antenna 20-2 used in the fifteenth embodiment.
  • the slot 21 is formed such that the length of the parallel portion 22 of the slot 21 is shorter than that of the slot antenna 20-1 of the fourteenth embodiment.
  • the impedance was measured on a simulator.
  • FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-2 of the fifteenth embodiment. The outline of FIG. 12 is similar to that of FIG.
  • FIG. 13 is a diagram showing the shape of the slot antenna 20-3 used in the sixteenth embodiment.
  • the slot 21 is formed such that the length of the parallel portion 22 of the slot 21 is shorter than that of the slot antenna 20-2 of the fifteenth embodiment.
  • the impedance was measured on a simulator.
  • FIG. 14 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-3 of the sixteenth embodiment. The outline of FIG. 14 is similar to that of FIG.
  • FIG. 15 is a diagram showing the shape of the slot antenna 20-4 used in the seventeenth embodiment.
  • the slot 21 is formed so that the vertical portion 23 of the slot 21 is eliminated and only the parallel portion 22 is provided.
  • the length of the parallel portion 22 of the slot 21 is the same as that of the slot antenna 20-1 of the fourteenth embodiment.
  • the impedance was measured on a simulator.
  • FIG. 16 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-4 of the seventeenth embodiment. The outline of FIG. 16 is similar to that of FIG.
  • FIG. 17 is a diagram showing the shape of the slot antenna 20-5 used in the eighteenth embodiment.
  • the slot 21 is formed such that the width of the parallel portion 22 of the slot 21 is larger than that of the slot antenna 20-4 of the seventeenth embodiment.
  • the impedance was measured on a simulator.
  • FIG. 18 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-5 of the eighteenth embodiment. The outline of FIG. 18 is similar to that of FIG.
  • FIG. 19 is a diagram showing the shape of the slot antenna 20-6 used in the nineteenth embodiment.
  • the slot antenna 20-6 of the nineteenth embodiment is formed so that the dimension in the lateral direction (y direction) is shorter than that of the slot antenna 20-1 of the fourteenth embodiment.
  • the shape of the slot 21 is the same as that of the slot antenna 20-1 of the fourteenth embodiment.
  • FIG. 20 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-6 of Example 19. In FIG. The outline of FIG. 20 is similar to that of FIG.
  • Comparative verification of each of Examples 14 to 19 was performed based on the impedance characteristics of the slot antenna 20-1 of Example 14, which has the same shape and dimensions as the actual slot antenna 20 used in Example 1 and the like. .
  • the impedance characteristics of the slot antenna 20-1 of Example 14 which has the same shape and dimensions as the actual slot antenna 20 used in Example 1 and the like.
  • FIG. 22 is a diagram showing the results of evaluating the influence of the RFID tag of Example 1 on each kind of metal as the attachment target 200 in the present embodiment described above. However, in this evaluation, the label paper 105 was not used, and both ends of the tab were fixed to a metal plate with an adhesive tape.
  • the RFID tag of this embodiment can exhibit good communication performance for each metal type.
  • REFERENCE SIGNS LIST 100 RFID tag 101 inlay 10 IC chip 20 slot antenna 21 slot 22 pair of parallel parts 23 pair of vertical parts 102 magnetic sheet 30 slit 103 dielectric layer 200 attachment object

Abstract

An RFID tag (100) comprises: an inlay (101) having an IC chip (10) in which identification information is recorded, and a slot antenna (20) connected to the IC chip (10); and a magnetic sheet (102) layered on the inlay (101) on the adhered object side. The slot antenna (20) is formed of a metal thin film, and a slot (21), formed by cutting out a portion of the metal thin film in a long narrow shape, is provided in the slot antenna (20). The magnetic sheet (102) is provided with a slit (30) that divides a magnetic layer having magnetic characteristics. The slit (30) is disposed in a region which overlaps the slot (21) of the inlay (101) in a state in which the magnetic sheet (102) and the inlay (101) are layered.

Description

ＲＦＩＤタグ及びＲＦＩＤタグの製造方法RFID tag and RFID tag manufacturing method
　本開示は、ＲＦＩＤタグ及びＲＦＩＤタグの製造方法に関する。 The present disclosure relates to RFID tags and RFID tag manufacturing methods.
　物流管理や商品管理のため、貼付対象物に貼付されるＲＦＩＤ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ　Ｉｄｅｎｔｉｆｉｃａｔｉｏｎ）タグが普及している。ＲＦＩＤタグは、ＩＣチップとＩＣチップに電気的に接続されるアンテナとを備える。ＲＦＩＤタグは、無線タグ、ＩＣタグ、ＲＦ－ＩＤタグ、ＲＦタグと呼ばれることもある。 RFID (Radio Frequency Identification) tags that are affixed to objects to be affixed are widely used for logistics management and product management. An RFID tag includes an IC chip and an antenna electrically connected to the IC chip. RFID tags are also called wireless tags, IC tags, RF-ID tags, and RF tags.
　このようなＲＦＩＤタグが貼付される貼付対象物が金属製である場合、タグ内のアンテナによる通信ができず、識別情報の読み出しに支障をきたすことがある。これは、金属がＲＦＩＤタグの周辺にあると、データを送受信するリーダライタからＲＦＩＤタグに送られた電磁波が、金属部で渦電流として損失してしまうため、ＩＣチップからデータを再びアンテナに打ち返すためのエネルギが効率的に得られないことが原因と推測される。 If the object to which such an RFID tag is attached is made of metal, communication by the antenna inside the tag may not be possible, which may hinder reading of the identification information. This is because if there is metal around the RFID tag, the electromagnetic wave sent from the reader/writer that transmits and receives data to the RFID tag is lost as eddy current in the metal part, so the data is sent back from the IC chip to the antenna again. It is presumed that the cause is that the energy for this is not obtained efficiently.
　これらの問題を解決する手段として、磁性シートの使用が有効であることが知られている。ＲＦＩＤタグと、貼付対象物である金属との間に磁性シートを挟むことで、アンテナが受けた電磁波を磁性シート内部で循環させ、ＩＣチップに供給するエネルギを効率的に伝送することができる（例えば非特許文献１参照）。 It is known that the use of magnetic sheets is effective as a means of solving these problems. By sandwiching the magnetic sheet between the RFID tag and the metal object to be attached, the electromagnetic waves received by the antenna are circulated inside the magnetic sheet, and the energy supplied to the IC chip can be efficiently transmitted ( For example, see Non-Patent Document 1).
　ところで、ＲＦＩＤタグの通信に用いられる周波数帯は、ＨＦ帯（１３．５６ＭＨｚ、電磁誘導方式）と比較して長距離通信や複数の対象物の一括読み取りが可能となるＵＨＦ帯（電波方式）のニーズが高まっている。しかしながら、従来のＲＦＩＤタグと金属との間に磁性シートを挟む構成では、ＵＨＦ帯で通信ができない虞がある。 By the way, the frequency band used for RFID tag communication is the UHF band (radio wave method), which enables long-distance communication and batch reading of multiple objects compared to the HF band (13.56 MHz, electromagnetic induction method). Needs are growing. However, there is a possibility that communication cannot be performed in the UHF band with a conventional configuration in which a magnetic sheet is sandwiched between an RFID tag and metal.
　本開示は、通信性能を向上できるＲＦＩＤタグ及びＲＦＩＤタグの製造方法を提供することを目的とする。 An object of the present disclosure is to provide an RFID tag capable of improving communication performance and a method for manufacturing the RFID tag.
　本発明の実施形態の一観点に係るＲＦＩＤタグは、貼付対象物に貼付されるＲＦＩＤタグであって、識別情報が記録されるＩＣチップと、前記ＩＣチップに接続されるスロットアンテナと、を有するインレイと、前記インレイの前記貼付対象物側に積層される磁性シートと、を備え、前記スロットアンテナは金属薄膜で形成され、前記スロットアンテナには、前記金属薄膜の一部が細長く切り抜かれたスロットが設けられ、前記磁性シートには、磁性特性を有する磁性層を区分するスリットが設けられ、前記スリットは、前記磁性シートと前記インレイとが積層された状態で、前記インレイの前記スロットと重なる領域に配置される。 An RFID tag according to one aspect of an embodiment of the present invention is an RFID tag attached to an object to be attached, and has an IC chip on which identification information is recorded and a slot antenna connected to the IC chip. An inlay and a magnetic sheet laminated on the side of the object to be adhered to the inlay, wherein the slot antenna is formed of a metal thin film, and the slot antenna is formed by cutting out a part of the metal thin film into a long and narrow slot. The magnetic sheet is provided with a slit that separates a magnetic layer having magnetic properties, and the slit is a region that overlaps the slot of the inlay in a state in which the magnetic sheet and the inlay are laminated. placed in
　同様に、本発明の実施形態の一観点に係るＲＦＩＤタグの製造方法は、磁性特性を有する磁性層を区分するスリットが設けられる磁性シートを形成するステップと、識別情報が記録されるＩＣチップと、前記ＩＣチップに接続されるスロットアンテナと、を有するインレイと、前記形成するステップにて形成された前記磁性シートを積層するステップと、を含み、前記スロットアンテナは金属薄膜で形成され、前記スロットアンテナには、前記金属薄膜の一部が細長く切り抜かれたスロットが設けられ、前記スリットは、前記磁性シートと前記インレイとが積層された状態で、前記インレイの前記スロットと重なる領域に配置される。 Similarly, a method for manufacturing an RFID tag according to one aspect of an embodiment of the present invention includes the steps of forming a magnetic sheet provided with slits for separating a magnetic layer having magnetic properties, and an IC chip on which identification information is recorded. a slot antenna connected to the IC chip; and a step of stacking the magnetic sheets formed in the forming step, wherein the slot antenna is formed of a metal thin film, and the slot antenna is formed of a metal thin film. The antenna is provided with a slot obtained by cutting out a part of the metal thin film in a long and narrow shape, and the slit is arranged in a region overlapping the slot of the inlay in a state in which the magnetic sheet and the inlay are laminated. .
　本開示によれば、通信性能を向上できるＲＦＩＤタグ及びＲＦＩＤタグの製造方法を提供することができる。 According to the present disclosure, it is possible to provide an RFID tag capable of improving communication performance and a method for manufacturing an RFID tag.
実施形態に係るＲＦＩＤタグの積層断面図Stacked sectional view of the RFID tag according to the embodiment 図１に示すＲＦＩＤタグの分解斜視図FIG. 2 is an exploded perspective view of the RFID tag shown in FIG. 図１に示すＲＦＩＤタグの上方から視た平面図FIG. 2 is a plan view of the RFID tag shown in FIG. 1 as viewed from above; スロットアンテナの他の形状のスロットの一例を示す平面図A plan view showing an example of another shaped slot of a slot antenna 実施形態に係るＲＦＩＤタグの製造方法の一例を示すフローチャートFlowchart showing an example of a method for manufacturing an RFID tag according to an embodiment 実施例１で用いるスロットアンテナとスロットの各部の寸法を示す図FIG. 4 is a diagram showing the dimensions of each part of the slot antenna and the slot used in the first embodiment; 実施例１～５及び比較例２のＲＦＩＤタグの周波数特性を示す図FIG. 4 shows frequency characteristics of RFID tags of Examples 1 to 5 and Comparative Example 2; 実施例６～９のＲＦＩＤタグの周波数特性を示す図FIG. 10 is a diagram showing frequency characteristics of RFID tags of Examples 6 to 9; 実施例１４で用いたスロットアンテナの形状を示す図The figure which shows the shape of the slot antenna used in Example 14. 実施例１４のスロットアンテナのインピーダンス特性の計測結果を示す図FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 14; 実施例１５で用いたスロットアンテナの形状を示す図The figure which shows the shape of the slot antenna used in Example 15. 実施例１５のスロットアンテナのインピーダンス特性の計測結果を示す図FIG. 15 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 15; 実施例１６で用いたスロットアンテナの形状を示す図The figure which shows the shape of the slot antenna used in Example 16. 実施例１６のスロットアンテナのインピーダンス特性の計測結果を示す図FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 16; 実施例１７で用いたスロットアンテナの形状を示す図The figure which shows the shape of the slot antenna used in Example 17. 実施例１７のスロットアンテナのインピーダンス特性の計測結果を示す図FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 17; 実施例１８で用いたスロットアンテナの形状を示す図The figure which shows the shape of the slot antenna used in Example 18. 実施例１８のスロットアンテナのインピーダンス特性の計測結果を示す図FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 18; 実施例１９で用いたスロットアンテナの形状を示す図The figure which shows the shape of the slot antenna used in Example 19. 実施例１９のスロットアンテナのインピーダンス特性の計測結果を示す図FIG. 19 is a diagram showing measurement results of impedance characteristics of the slot antenna of Example 19; 変形例に係るＲＦＩＤタグの積層断面図Stacked sectional view of an RFID tag according to a modified example 実施形態に係るＲＦＩＤタグの各金属種に対する特性例を示す図FIG. 4 is a diagram showing an example of characteristics for each metal type of the RFID tag according to the embodiment;
　以下、添付図面を参照しながら実施形態について説明する。説明の理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の符号を付して、重複する説明は省略する。 Embodiments will be described below with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.
　なお、以下の説明において、ｘ方向、ｙ方向、ｚ方向は互いに垂直な方向である。ｘ方向はインレイ１０１や磁性シート１０２の長手方向であり、スロット２１の平行部２２及びスリット３０の延在方向である。ｙ方向は、インレイ１０１や磁性シート１０２の短手方向であり、スロット２１の垂直部２３の延在方向である。ｚ方向は、インレイ１０１や磁性シート１０２などＲＦＩＤタグ１００の各構成要素の積層方向である。また、以下では説明の便宜上、ｚ正方向側を上側、ｚ負方向側を下側とも表現する場合がある。 In the following description, the x-direction, y-direction, and z-direction are directions perpendicular to each other. The x-direction is the longitudinal direction of the inlay 101 and the magnetic sheet 102 and the extending direction of the parallel portion 22 of the slot 21 and the slit 30 . The y direction is the lateral direction of the inlay 101 and the magnetic sheet 102 and the extending direction of the vertical portion 23 of the slot 21 . The z-direction is the stacking direction of each component of the RFID tag 100 such as the inlay 101 and the magnetic sheet 102 . In the following, for convenience of explanation, the positive z direction side may also be referred to as the upper side, and the negative z direction side may also be referred to as the lower side.
　図１は、実施形態に係るＲＦＩＤタグ１００の積層断面図である。図２は、図１に示すＲＦＩＤタグ１００の分解斜視図である。図３は、図１に示すＲＦＩＤタグ１００の上方から視た平面図である。ＲＦＩＤタグ１００は、貼付対象物２００に貼付される略平面状の装置である。図１～図３に示すように、ＲＦＩＤタグは、インレイ１０１と、磁性シート１０２と、誘電層１０３とを備える。貼付対象物２００は、例えば金属である。金属としては、鉄、アルミニウム、銅などの金属の他、鉄合金、アルミ合金、銅合金等の金属の合金を含む。なお、貼付対象物２００には、金属以外の他の材料、例えばプラスチックス、紙、セラミックスなども含まれる。 FIG. 1 is a laminated cross-sectional view of the RFID tag 100 according to the embodiment. FIG. 2 is an exploded perspective view of the RFID tag 100 shown in FIG. FIG. 3 is a top plan view of the RFID tag 100 shown in FIG. The RFID tag 100 is a substantially planar device that is attached to an attachment target 200 . As shown in FIGS. 1-3, the RFID tag comprises an inlay 101, a magnetic sheet 102 and a dielectric layer 103. FIG. The sticking target 200 is, for example, metal. Metals include metals such as iron, aluminum, and copper, as well as metal alloys such as iron alloys, aluminum alloys, and copper alloys. Note that the object 200 to be affixed includes materials other than metal, such as plastics, paper, and ceramics.
　実施形態に係るＲＦＩＤタグ１００の主な使用用途としては、ドラム缶、Ｈ鋼等の比較的大きな金属製品への貼り付けが対象であり、これらの金属製品個々の在庫管理等を含む流通経路上の追跡（トレサビリティ）に使用できる。その他に、金属製品以外にも、本件のタグを貼り付けて使用してもよい。 The main application of the RFID tag 100 according to the embodiment is to attach it to relatively large metal products such as drums and H steel, and to manage the inventory of each of these metal products. Can be used for tracking (traceability). In addition to metal products, the tag of this case may be attached and used.
　さらに、本実施形態のＲＦＩＤタグは、可撓性を有しており、被着体の表面が湾曲していても貼り付け可能である。湾曲状に曲げられて状態においても、良好な通信性能を発揮でき、ドラム缶やスプレー缶などの曲面を有する物品の識別にも本実施形態のＲＦＩＤタグを使用することができ、用途の多様化を図ることができる。 Furthermore, the RFID tag of this embodiment is flexible and can be attached even if the surface of the adherend is curved. Good communication performance can be exhibited even when bent into a curved shape, and the RFID tag of the present embodiment can be used to identify articles with curved surfaces such as drums and spray cans, thus diversifying the applications. can be planned.
　インレイ１０１は、ＲＦＩＤタグ１００の機能に関する要素を含む部分であり、図２、図３に示すように、識別情報が記録されるＩＣチップ１０と、ＩＣチップ１０に接続されるスロットアンテナ２０と、を有する。スロットアンテナ２０は金属薄膜で形成される。スロットアンテナ２０には、金属薄膜の一部が細長く切り抜かれたスロット２１が設けられる。インレイ１０１は、例えばＰＥＴフィルム上に、アルミシートをドライラミネートで貼り付けたスロットアンテナ２０が形成され、規定の位置にＩＣチップ１０が実装されている。 The inlay 101 is a part including elements related to the function of the RFID tag 100, and as shown in FIGS. have The slot antenna 20 is made of a metal thin film. The slot antenna 20 is provided with a slot 21 obtained by cutting out a part of the thin metal film. The inlay 101 has a slot antenna 20 formed by dry laminating an aluminum sheet on a PET film, for example, and an IC chip 10 is mounted at a prescribed position.
　インレイ１０１の主面の中央にＩＣチップ１０が配置され、スロットアンテナ２０のスロット２１は、ＩＣチップ１０を挟んで所定方向（図２、図３の例ではｘ方向）に平行に延在する一対の平行部２２と、これらの一対の平行部２２と直交する方向（ｙ方向）に延在する一対の垂直部２３とを有する。一対の垂直部２３は、ＩＣチップ１０を挟んでｘ方向に略等間隔の位置にそれぞれ配置される。 The IC chip 10 is arranged in the center of the main surface of the inlay 101, and the slot 21 of the slot antenna 20 is a pair extending in parallel in a predetermined direction (the x direction in the examples of FIGS. 2 and 3) with the IC chip 10 interposed therebetween. and a pair of vertical portions 23 extending in a direction orthogonal to the pair of parallel portions 22 (y-direction). The pair of vertical portions 23 are arranged at approximately equal intervals in the x direction with the IC chip 10 interposed therebetween.
　なお、ＩＣチップ１０のインピーダンスの周波数特性は以下のとおりである。
・８６６ＭＨｚ：１５－ｊ２６５（Ω）
・９１５ＭＨｚ：１４－ｊ２５２（Ω）
・９５３ＭＨｚ：１３－ｊ２４２（Ω） The impedance frequency characteristics of the IC chip 10 are as follows.
・866MHz: 15-j265 (Ω)
・915MHz: 14-j252 (Ω)
・953MHz: 13-j242 (Ω)
　スロットアンテナ２０のインピーダンスは、９１５～９２０ＭＨｚで上記のＩＣチップ１０のインピーダンスと整合するように設計されている。このようなインピーダンスの整合により、電流の損失が少なくなり、損失を少なくすることで通信可能距離が増大する。 The impedance of the slot antenna 20 is designed to match the impedance of the IC chip 10 at 915-920 MHz. Such impedance matching reduces current loss, and the reduced loss increases the communicable distance.
　磁性シート１０２は、磁性材料を含有するシート材であり、インレイ１０１の貼付対象物２００側に積層される。磁性シート１０２は、例えばステンレス系合金などの磁性粉末をゴム材や樹脂等に均一かつ配向して分散するように練り込んで形成される。図２、図３に示すように、磁性シート１０２には、磁性特性を有する磁性層を区分するスリット３０が設けられる。スリット３０は、磁性シート１０２とインレイ１０１とが積層された状態で、インレイ１０１のスロット２１と重なる領域に配置される。 The magnetic sheet 102 is a sheet material containing a magnetic material, and is laminated on the inlay 101 on the sticking object 200 side. The magnetic sheet 102 is formed by, for example, kneading magnetic powder such as a stainless steel alloy into a rubber material, resin, or the like so as to uniformly and oriented and disperse the powder. As shown in FIGS. 2 and 3, the magnetic sheet 102 is provided with slits 30 that separate the magnetic layers having magnetic properties. The slit 30 is arranged in a region overlapping the slot 21 of the inlay 101 in a state in which the magnetic sheet 102 and the inlay 101 are laminated.
　スリット３０は、例えば図３に示すように、磁性シート１０２のｙ方向の中央の位置に、ｘ方向に沿って延在するよう形成される。また、スロットアンテナ２０のスロット２１と、磁性シート１０２のスリット３０との配置は、例えば図３に示すように、スリット３０の領域にスロット２１のうち少なくとも一対の平行部２２の全体が含まれるように配置される。 For example, as shown in FIG. 3, the slit 30 is formed at the center position of the magnetic sheet 102 in the y direction so as to extend along the x direction. Also, the slots 21 of the slot antenna 20 and the slits 30 of the magnetic sheet 102 are arranged such that at least a pair of parallel portions 22 of the slots 21 are entirely included in the area of the slits 30, as shown in FIG. placed in
　磁性シート１０２には、ＵＨＦ帯の電波に対して優れた磁気シールド特性を有するものを用いるのが好ましい。磁性シート１０２は、磁性フィラー、バインダー樹脂等の成分が含まれる磁性塗料を、支持体上に塗布して乾燥させることで得られる。磁性シート１０２をＵＨＦ帯の電波に対して優れた磁気シールド特性を有するものにするためには、乾燥後の磁性シート１０２の膜厚が、好ましくは５００μｍ以下、より好ましくは３００μｍ以下となるように、磁性塗料が塗布される。また、乾燥後の磁性シート１０２の膜厚が、好ましくは５０μｍ以上、より好ましくは１００μｍ以下となるように、磁性塗料が塗布される。 For the magnetic sheet 102, it is preferable to use a material having excellent magnetic shielding properties against radio waves in the UHF band. The magnetic sheet 102 is obtained by coating a support with a magnetic paint containing components such as a magnetic filler and a binder resin and drying the paint. In order for the magnetic sheet 102 to have excellent magnetic shielding properties against radio waves in the UHF band, the film thickness of the magnetic sheet 102 after drying is preferably 500 μm or less, more preferably 300 μm or less. , magnetic paint is applied. In addition, the magnetic paint is applied so that the film thickness of the magnetic sheet 102 after drying is preferably 50 μm or more, more preferably 100 μm or less.
　同様に、磁性シート１０２をＵＨＦ帯の電波に対して優れた磁気シールド特性を有するものにするためには、磁性シートの８６０～９６０ＭＨｚの周波数帯域における複素比透磁率の損失係数ｔａｎδ（μ´／μ´´）は、好ましくは０．３以下、より好ましくは０．２８以下である。また、磁性シートの８６０～９６０ＭＨｚの周波数帯域における複素比透磁率の損失係数ｔａｎδ（μ´／μ´´）は、好ましくは０．０５以上、より好ましくは０．１以上である。 Similarly, in order for the magnetic sheet 102 to have excellent magnetic shielding properties against radio waves in the UHF band, the loss coefficient tan δ (μ′/ μ″) is preferably 0.3 or less, more preferably 0.28 or less. Further, the loss coefficient tan δ (μ′/μ″) of the complex relative magnetic permeability in the frequency band of 860 to 960 MHz of the magnetic sheet is preferably 0.05 or more, more preferably 0.1 or more.
　なお、本実施の形態におけるタグの厚さ（剥離紙を除く）は、２００μｍ～１０００μｍであり、好ましくは３００～４００μｍである。また、磁性シートとインレイを貼り合せた状態の厚さ（ラベル紙及び剥離紙は除く）は、１５０～２５０μｍであり、好ましくは１９０～２１０μｍであり、より好ましくは２００μｍ程度である。ラベル紙の厚さは、粘着層を含め、５０μｍ～３００μｍである。剥離紙の厚さは、５０μｍ～３００μｍである。 The thickness of the tag (excluding the release paper) in this embodiment is 200 μm to 1000 μm, preferably 300 to 400 μm. The thickness of the magnetic sheet and the inlay in a state of being laminated (excluding label paper and release paper) is 150 to 250 μm, preferably 190 to 210 μm, more preferably about 200 μm. The thickness of the label paper is 50 μm to 300 μm including the adhesive layer. The thickness of the release paper is 50 μm to 300 μm.
　同様に、磁性シート１０２をＵＨＦ帯の電波に対して優れた磁気シールド特性を有するものにするためには、磁性シートの８６０～９６０ＭＨｚの周波数帯域における複素比透磁率の実数部μ´は、好ましくは５．０以上であり、より好ましくは５．２以上である。また、磁性シートの８６０～９６０ＭＨｚの周波数帯域における複素比透磁率の実数部μ´は、好ましくは７．０以下であり、より好ましくは６．０以下である。 Similarly, in order for the magnetic sheet 102 to have excellent magnetic shielding properties against radio waves in the UHF band, the real part μ′ of the complex relative permeability of the magnetic sheet in the frequency band of 860 to 960 MHz is preferably is 5.0 or more, more preferably 5.2 or more. Further, the real part μ′ of the complex relative permeability of the magnetic sheet in the frequency band of 860 to 960 MHz is preferably 7.0 or less, more preferably 6.0 or less.
　また、上記の複素比透磁率の条件を満たすためには、磁性塗料に含まれる磁性フィラーの材質は、Ｆｅ－Ｃｒ合金であるのが好ましい。また、磁性フィラーとバインダーの固形分の質量比（磁性フィラーの質量／バインダーの固形分の質量）が７０／３０以上であるのが好ましく、７５／２５以上であるのがより好ましく、８０／２０以上であるのがさらに好ましい。さらに、磁性フィラーとバインダーの固形分の質量比（磁性フィラーの質量／バインダーの固形分の質量）は、９５／５以下であるのが好ましく、９０／１０以下であるのがより好ましく、８５／１５以下であるのがさらに好ましい。 Further, in order to satisfy the condition of the above complex relative magnetic permeability, the material of the magnetic filler contained in the magnetic paint is preferably an Fe--Cr alloy. Further, the mass ratio of the solid content of the magnetic filler and the binder (mass of the magnetic filler/mass of the solid content of the binder) is preferably 70/30 or more, more preferably 75/25 or more, and 80/20. It is more preferable that it is above. Furthermore, the mass ratio of the solid content of the magnetic filler and the binder (mass of the magnetic filler/mass of the solid content of the binder) is preferably 95/5 or less, more preferably 90/10 or less, and 85/ It is more preferably 15 or less.
　また、磁性塗料に含まれるバインダー樹脂は、エポキシ樹脂、ウレタン樹脂、またはポリエステル樹脂から成る群より選ばれる１種類以上の樹脂であり、エポキシ樹脂が好ましい。 Further, the binder resin contained in the magnetic paint is one or more resins selected from the group consisting of epoxy resins, urethane resins, and polyester resins, preferably epoxy resins.
　誘電層１０３は、磁性シート１０２の貼付対象物２００側にさらに積層され、磁性シート１０２と貼付対象物２００との間に配置される。図２では、誘電層１０３は磁性シート１０２の下方に一体的に図示されている。誘電層１０３は、例えば厚紙や合成樹脂等の繊維からなる織布や不織布、セラミックガラス等の無機材料のシートなどの絶縁体で形成されるのが好ましい。本実施形態では、誘電層１０３は、例えば発泡ＰＥＴで形成される。誘電層１０３の材料は、比誘電率が１．２～３．０程度であるのものが好ましく、これによりＲＦＩＤタグ１００の通信距離を増やすことができる。 The dielectric layer 103 is further laminated on the attachment target 200 side of the magnetic sheet 102 and arranged between the magnetic sheet 102 and the attachment target 200 . In FIG. 2, dielectric layer 103 is shown integrally beneath magnetic sheet 102 . The dielectric layer 103 is preferably formed of an insulator such as a woven fabric or non-woven fabric made of fiber such as cardboard or synthetic resin, or a sheet of an inorganic material such as ceramic glass. In this embodiment, the dielectric layer 103 is made of foamed PET, for example. The material of the dielectric layer 103 preferably has a dielectric constant of about 1.2 to 3.0, so that the communication distance of the RFID tag 100 can be increased.
　また、図１に示すように、誘電層１０３は、インレイ１０１及び磁性シート１０２を、貼付対象物２００からその厚み分だけ離間させた状態で配置させるスペーサとしても機能する。誘電層１０３は、外力に応じてインレイ１０１及び磁性シート１０２と共に任意に変形可能な材料で形成され、これにより貼付対象物２００の貼付面が湾曲している場合でもＲＦＩＤタグ１００を容易に貼付でき、汎用性を向上できるよう構成されるのが好ましい。 In addition, as shown in FIG. 1, the dielectric layer 103 also functions as a spacer that separates the inlay 101 and the magnetic sheet 102 from the attachment target 200 by the thickness thereof. The dielectric layer 103 is made of a material that can be arbitrarily deformed together with the inlay 101 and the magnetic sheet 102 in response to an external force. , is preferably configured to improve versatility.
　また、ＲＦＩＤタグ１００では、例えば図２に示すように、インレイ１０１と磁性シート１０２との間に粘着層１０４が配置される（図１では図示を省略している）。粘着層１０４は、積層時には、磁性シート１０２のスリット３０とその下方の誘電層１０３とによって形成される隙間に進入して、この隙間を埋めることができる。 Also, in the RFID tag 100, for example, as shown in FIG. 2, an adhesive layer 104 is arranged between the inlay 101 and the magnetic sheet 102 (not shown in FIG. 1). During lamination, the adhesive layer 104 can enter the gap formed by the slit 30 of the magnetic sheet 102 and the dielectric layer 103 therebelow to fill the gap.
　また、本実施形態のＲＦＩＤタグ１００では、インレイ１０１の上方にさらにラベル紙（フィルム系タック紙）１０５が配置される。ラベル紙１０５は、ｚ正方向側の表面に印刷可能である。ラベル紙の素材は適宜選択可能である。 Further, in the RFID tag 100 of this embodiment, a label paper (film-based tack paper) 105 is further arranged above the inlay 101 . The label paper 105 can be printed on the surface in the positive z direction. The material of the label paper can be appropriately selected.
　また、図１に示すように、ラベル紙１０５のｚ負方向側の裏面には粘着剤１０６が塗布されている。ラベル紙１０５は、インレイ１０１、磁性シート１０２、及び誘電層１０３より大きく形成されており、図２に示すように、インレイ１０１、磁性シート１０２、及び誘電層１０３の外形の全周をラベル紙１０５の外縁部分１０５Ａが包囲するよう形成されている。これにより、図１に示すように、ＲＦＩＤタグ１００が貼付対象物２００に貼付されるときには、インレイ１０１、磁性シート１０２、及び誘電層１０３の外側がラベル紙１０５によって完全に覆われ、ラベル紙１０５の外縁部分１０５Ａが貼付対象物２００と接触する。つまり、ラベル紙１０５の外縁部分１０５Ａの粘着剤１０６によって、ＲＦＩＤタグ１００の全体が貼付対象物２００に貼付される。 Further, as shown in FIG. 1, an adhesive 106 is applied to the back surface of the label paper 105 on the negative z direction side. The label paper 105 is formed larger than the inlay 101, the magnetic sheet 102, and the dielectric layer 103, and as shown in FIG. is formed to surround the outer edge portion 105A. Accordingly, as shown in FIG. 1, when the RFID tag 100 is attached to the attachment target 200, the outer sides of the inlay 101, the magnetic sheet 102, and the dielectric layer 103 are completely covered with the label paper 105. The outer edge portion 105A of the contact with the application target 200 . That is, the entire RFID tag 100 is attached to the attachment target 200 by the adhesive 106 on the outer edge portion 105A of the label paper 105 .
　また、粘着剤１０６は、例えば長期間使用する使用環境においては接着剤を用いることができる。しかし、接着剤は硬化すると剥離が困難になる場合がある。これに対し、粘着剤は、通常、作業者の手作業等でＲＦＩＤタグを対象物品から剥離可能であり、さらに、粘着剤の種類によっては剥離後にＲＦＩＤタグを再度貼り付け可能でありＲＦＩＤタグとして再利用可能となる場合がある。 Also, for the adhesive 106, an adhesive can be used, for example, in a usage environment in which it is used for a long period of time. However, once the adhesive has cured, it may become difficult to remove. On the other hand, the adhesive usually allows the RFID tag to be peeled off from the target article manually by an operator, etc., and depending on the type of adhesive, the RFID tag can be re-attached after peeling, and the RFID tag can be used. May be reusable.
　なお、図１に示す、ラベル紙１０５の粘着剤１０６によってＲＦＩＤタグ１００を貼付する構成の場合には、誘電層１０３と貼付対象物２００との間には粘着剤を塗布せずに、誘電層１０３を貼付対象物２００に接着（粘着）しなくてよい。 In the case of the structure shown in FIG. 1, in which the RFID tag 100 is attached by the adhesive 106 of the label paper 105, the adhesive is not applied between the dielectric layer 103 and the attachment target 200, and the dielectric layer 103 does not have to be adhered (adhered) to the sticking object 200 .
　また、図２に示すように、使用前のＲＦＩＤタグ１００には、誘電層１０３より下方に剥離紙１０７が配置される。剥離紙１０７は、例えばラベル紙１０５と同一以上の大きさで形成され、ラベル紙１０５と剥離紙１０７とが、外縁部分の粘着剤１０６によって密着される。これにより、ラベル紙１０５の外縁部分１０５Ａの粘着剤１０６が貼付対象物２００への貼付に用いられる前に外部に露出することを防止でき、粘着力を保持できる。ＲＦＩＤタグ１００の使用時には、剥離紙１０７がＲＦＩＤタグ１００から剥がされて、これにより露出したラベル紙１０５の粘着剤１０６によってＲＦＩＤタグ１００が貼付対象物２００に貼付される。 In addition, as shown in FIG. 2, a release paper 107 is arranged below the dielectric layer 103 on the RFID tag 100 before use. The release paper 107 is, for example, formed to have a size equal to or larger than that of the label paper 105, and the label paper 105 and the release paper 107 are adhered to each other by the adhesive 106 on the outer edge portion. As a result, the adhesive 106 on the outer edge portion 105A of the label paper 105 can be prevented from being exposed to the outside before being used for attachment to the attachment target 200, and the adhesive strength can be maintained. When using the RFID tag 100 , the release paper 107 is peeled off from the RFID tag 100 , and the exposed adhesive 106 of the label paper 105 sticks the RFID tag 100 to the sticking object 200 .
　また、剥離紙１０７は、図２に例示するものよりも大きく形成され、一枚の剥離紙１０７の上に複数個のＲＦＩＤタグ１００が配置される構成でもよい。これにより、製造効率や搬送効率を向上できる。 Also, the release paper 107 may be formed larger than the one illustrated in FIG. As a result, manufacturing efficiency and transport efficiency can be improved.
　なお、ラベル紙１０５の下面の粘着剤１０６に関して、ＲＦＩＤタグ１００の面積の５０％以上の面積が剥離紙１０７に貼り合わせられることが好ましい。ＲＦＩＤタグ１００の製造工程では、一方向へ延びる剥離紙１０７上に複数のＲＦＩＤタグ１００が配置されて、ＲＩＤＦタグ１００を含む剥離紙１０７がロール状とされる。印刷工程では、ロール状の剥離紙１０７が引き出されて個々のＲＦＩＤタグ１００に対して印刷処理が施されて、印刷処理の終了後に再度ロール状とされて保管される。このような製造工程及び印刷工程において、ロール状とされる剥離紙１０７からのＲＦＩＤタグ１００の離脱を防ぐためである。 Regarding the adhesive 106 on the lower surface of the label paper 105 , it is preferable that the release paper 107 is attached to an area of 50% or more of the area of the RFID tag 100 . In the manufacturing process of the RFID tag 100, a plurality of RFID tags 100 are arranged on a release paper 107 extending in one direction, and the release paper 107 including the RFID tags 100 is rolled. In the printing process, the roll-shaped release paper 107 is pulled out and the printing process is applied to each RFID tag 100. After the printing process is completed, the roll-shaped release paper 107 is re-rolled and stored. This is to prevent the RFID tag 100 from detaching from the roll-shaped release paper 107 in such a manufacturing process and a printing process.
　なお、ＲＦＩＤタグ１００の積層構造は図１、図２に示すものに限られない。図２１は、変形例に係るＲＦＩＤタグ１００Ａの積層断面図である。図２１に示すように、ラベル紙１０５が、インレイ１０１、磁性シート１０２、及び誘電層１０３と同じ大きさで形成される構成でもよい。この場合、ラベル紙１０５の外縁部分が貼付対象物２００には接触できないので、貼付対象物２００と対向する誘電層１０３の下面に粘着剤１０６が塗布されて、誘電層１０３が貼付対象物２００に接着されることによって、ＲＦＩＤタグ１００Ａの全体が貼付対象物２００に貼付される。 Note that the laminated structure of the RFID tag 100 is not limited to those shown in FIGS. FIG. 21 is a lamination cross-sectional view of an RFID tag 100A according to a modification. As shown in FIG. 21, the label paper 105 may have the same size as the inlay 101, the magnetic sheet 102, and the dielectric layer 103. FIG. In this case, since the outer edge portion of the label paper 105 cannot contact the object 200 to be adhered, the adhesive 106 is applied to the lower surface of the dielectric layer 103 facing the object 200 to be adhered, so that the dielectric layer 103 adheres to the object 200 to be adhered. The entire RFID tag 100A is attached to the attachment target 200 by being adhered.
　なお、図２、図３に示したスロットアンテナ２０のスロット２１の形状は一例であり、図２、図３に示した形状には限定されない。図４は、スロットアンテナ２０の他の形状のスロット２１Ａの一例を示す平面図である。 The shape of the slot 21 of the slot antenna 20 shown in FIGS. 2 and 3 is an example, and is not limited to the shapes shown in FIGS. FIG. 4 is a plan view showing an example of another shaped slot 21A of the slot antenna 20. As shown in FIG.
　スロットアンテナ２０のスロットの形状は、例えば図４に示すスロット２１Ａのように、一対の平行部２２Ａのみを有し、垂直部が無い形状でもよい。図４の例では、平行部２２Ａは、図３の垂直部２３の延在方向に向けて、図３の平行部２２よりも開口面積が増えており、ｙ方向の幅が大きくなっている。また、図４の例では、スリット３０の領域にスロット２１Ａの一対の平行部２２Ａが含まれるように、スリット３０の幅が広く形成されている。 The shape of the slot of the slot antenna 20 may be a shape having only a pair of parallel portions 22A and no vertical portion, such as the slot 21A shown in FIG. 4, for example. In the example of FIG. 4, the parallel portion 22A has an opening area larger than that of the parallel portion 22 in FIG. 3 toward the extending direction of the vertical portion 23 in FIG. 3 and a width in the y direction. In addition, in the example of FIG. 4, the width of the slit 30 is formed wide so that the region of the slit 30 includes the pair of parallel portions 22A of the slot 21A.
　図５は、実施形態に係るＲＦＩＤタグ１００の製造方法の一例を示すフローチャートである。ステップＳ１では、磁性特性を有する磁性層を区分するスリット３０が設けられた磁性シート１０２（スリット入り磁性シート）が形成される。 FIG. 5 is a flow chart showing an example of a method for manufacturing the RFID tag 100 according to the embodiment. In step S1, a magnetic sheet 102 (slit magnetic sheet) provided with slits 30 separating magnetic layers having magnetic properties is formed.
　このようなスリット入り磁性シート１０２は、例えば、ロール・トゥ・ロール方式により、ポリエステル系合成フィルム（東洋紡株式会社製、「クリスパーＫ１２１１　＃３８μ」）を速度３ｍ／ｍｉｎで搬送しながら、該フィルム上に、コーターを用いて磁気シールド塗料によるストライプパターンを形成し、４０℃から８０℃まで温度を上げながら３０ｍの硬化炉を通過させることで、形成できる。 Such a slitted magnetic sheet 102 is formed on a polyester synthetic film (manufactured by Toyobo Co., Ltd., "Crisper K1211 #38μ") at a speed of 3 m/min by, for example, a roll-to-roll method. Second, a striped pattern is formed by using a magnetic shield paint using a coater, and the magnetic shield paint is passed through a curing furnace of 30 m while raising the temperature from 40°C to 80°C.
　ステップＳ２では、ステップＳ１にて形成されたスリット入り磁性シート１０２と、インレイ１０１とが積層される。 In step S2, the slitted magnetic sheet 102 formed in step S1 and the inlay 101 are laminated.
　なお、ステップＳ１において磁性シート１０２に設けられるスリット３０は、ステップＳ２にて磁性シート１０２とインレイ１０１とが積層された状態で、インレイ１０１のスロット２１と重なる領域に配置されるよう形成される。 Note that the slits 30 provided in the magnetic sheet 102 in step S1 are formed so as to be arranged in a region overlapping the slots 21 of the inlay 101 in a state in which the magnetic sheet 102 and the inlay 101 are laminated in step S2.
　ステップＳ３では、磁性シート１０２のインレイ１０１と反対側の面に誘電層１０３が積層される。なお、ステップＳ２とＳ３とを逆に行い、磁性シート１０２と誘電層１０３とを積層した後に、インレイ１０１と磁性シート１０２とを積層する手順でもよい。 In step S3, the dielectric layer 103 is laminated on the surface of the magnetic sheet 102 opposite to the inlay 101. Alternatively, steps S2 and S3 may be reversed to laminate the inlay 101 and the magnetic sheet 102 after the magnetic sheet 102 and the dielectric layer 103 are laminated.
　ステップＳ４では、インレイ１０１の磁性シート１０２とは反対側の面にフィルム系タック紙（ラベル紙）１０５が積層される。 In step S4, a film-based tack paper (label paper) 105 is laminated on the surface of the inlay 101 opposite to the magnetic sheet 102 .
　このように、本実施形態に係るＲＦＩＤタグ１００は、識別情報が記録されるＩＣチップ１０と、ＩＣチップ１０に接続されるスロットアンテナ２０と、を有するインレイ１０１と、インレイ１０１の貼付対象物２００側に積層される磁性シート１０２と、を備える。スロットアンテナ２０は金属薄膜で形成され、スロットアンテナ２０には、金属薄膜の一部が細長く切り抜かれたスロット２１が設けられる。磁性シート１０２には、磁性特性を有する磁性層を区分するスリット３０が設けられる。このスリット３０は、磁性シート１０２とインレイ１０１とが積層された状態で、インレイ１０１のスロット２１と重なる領域に配置される。 Thus, the RFID tag 100 according to the present embodiment includes an inlay 101 having an IC chip 10 on which identification information is recorded, a slot antenna 20 connected to the IC chip 10, and an object 200 to which the inlay 101 is attached. and a magnetic sheet 102 laminated on the side. The slot antenna 20 is formed of a metal thin film, and the slot antenna 20 is provided with a slot 21 formed by cutting out a part of the metal thin film. The magnetic sheet 102 is provided with slits 30 that separate the magnetic layers having magnetic properties. This slit 30 is arranged in a region overlapping the slot 21 of the inlay 101 in a state in which the magnetic sheet 102 and the inlay 101 are laminated.
　このように磁性シート１０２にスリット３０を設けることにより、貼付対象物２００の種類によらず、ＲＦＩＤタグ１００のＵＨＦ帯における通信可能距離を増やすことが可能となり、通信性能を向上できる（後述する図２２参照）。また、ＨＦ帯と比較して長距離通信や複数の対象物の一括読み取りが可能とＵＨＦ帯の通信可能距離を増やすことができるので、汎用性の高いＲＦＩＤタグ１００を実現できる。 By providing the slit 30 in the magnetic sheet 102 in this way, it is possible to increase the communicable distance of the RFID tag 100 in the UHF band regardless of the type of the object 200 to be attached, and improve the communication performance (Fig. 22). In addition, compared to the HF band, long-distance communication and batch reading of a plurality of objects are possible, and the communicable distance of the UHF band can be increased.
　また、貼付対象物２００が金属製であると、従来のＲＦＩＤタグではタグ内のアンテナによる通信ができず、識別情報の読み出しに支障をきたすことがあるので、本実施形態に係るＲＦＩＤタグ１００通信性能を向上できるという効果は、貼付対象物２００が金属製であるときに特に顕著となる。 In addition, if the object 200 to be affixed is made of metal, the conventional RFID tag cannot communicate with the antenna in the tag, which may hinder the reading of the identification information. The effect of being able to improve the performance is particularly remarkable when the sticking target 200 is made of metal.
　また、磁性シートを用いない既存の金属用のＲＦＩＤタグにおいては、被着体としての金属の影響による通信性能低下を抑えるために、インレイと被着体との間に比較的大きな間隔が必要となり、その間隔を確保するためにＲＦＩＤタグの全体の厚みが３．５ｍｍ以上であり薄型化が困難であった。 In addition, in existing metal RFID tags that do not use a magnetic sheet, a relatively large gap is required between the inlay and the adherend in order to suppress deterioration in communication performance due to the influence of the metal as the adherend. However, the overall thickness of the RFID tag is 3.5 mm or more in order to secure the interval, and it is difficult to reduce the thickness of the RFID tag.
　これに対して、本実施形態のＲＦＩＤタグの厚みは、１ｍｍ以下であり、磁性シートを使用しない従来のＲＦＩＤタグよりも薄くすることができる。例えば、ラベル紙及び剥離紙を含んだＲＦＩＤタグの厚さとして約３５０μｍの厚さとすることができ、金属対応のＲＦＩＤタグとして著しく薄型化ができる。 On the other hand, the thickness of the RFID tag of this embodiment is 1 mm or less, and can be made thinner than conventional RFID tags that do not use a magnetic sheet. For example, the thickness of the RFID tag including the label paper and the release paper can be about 350 μm, and the thickness can be significantly reduced as a metal-compatible RFID tag.
　また、著しく薄型化が可能となることで、通常用いられている（汎用の）ラベルプリンターを用いて、ラベルの印刷とＩＣチップへの情報の書き込みとを同時に行うことが可能で、製造効率を一層高めることができる。 In addition, by making it possible to significantly reduce the thickness, it is possible to print labels and write information to IC chips at the same time using a commonly used (general-purpose) label printer, improving manufacturing efficiency. can be further enhanced.
　また、本実施形態に係るＲＦＩＤタグ１００では、磁性シート１０２の貼付対象物２００側にさらに積層される誘電層１０３を備えることにより、ＵＨＦ帯における通信可能距離をさらに増やすことができるので、通信性能をさらに向上できる。 Further, in the RFID tag 100 according to the present embodiment, the dielectric layer 103 further laminated on the attachment target 200 side of the magnetic sheet 102 can further increase the communicable distance in the UHF band. can be further improved.
　実施形態に係るＲＦＩＤタグ１００は、電磁誘導式の無線タグ、電波式の無線タグの何れにも適用可能である。特に、ＲＦＩＤタグ１００を、電波式の無線タグに適用した場合、リーダとの所定の無線通信距離を確保できる。所定の無線通信距離は、例えば０ｍから２０ｍまでの範囲である。 The RFID tag 100 according to the embodiment can be applied to both electromagnetic induction wireless tags and radio wave wireless tags. In particular, when the RFID tag 100 is applied to a radio wave type wireless tag, a predetermined wireless communication distance with a reader can be secured. The predetermined wireless communication distance ranges, for example, from 0m to 20m.
　実施形態に係るＲＦＩＤタグ１００は、ＵＨＦ帯の電波だけでなく、ＶＨＦ帯、ＳＨＦ帯などの電波にも適用可能である。ＲＦＩＤタグ１００の使用周波数がＵＨＦ帯の周波数、例えば８６０～９６０ＭＨｚ、９１５～９２５ＭＨｚなどである場合、ＵＨＦ帯はＶＨＦ帯に比べて、周波数が高いため、波長が短くなり、アンテナの小型化に有利である。従って、ＲＦＩＤタグ１００をＵＨＦ帯の電波に好適な形状にすることで、ＩＣチップ１０の小型化を図ることができると共に、メモリ容量も小さく安価な無線タグを得ることができる。 The RFID tag 100 according to the embodiment can be applied not only to radio waves in the UHF band, but also to radio waves in the VHF band, SHF band, and the like. When the frequency used by the RFID tag 100 is a UHF band frequency, such as 860 to 960 MHz, 915 to 925 MHz, etc., the UHF band has a higher frequency than the VHF band, so the wavelength becomes shorter, which is advantageous for miniaturizing the antenna. is. Therefore, by forming the RFID tag 100 into a shape suitable for radio waves in the UHF band, the size of the IC chip 10 can be reduced, and an inexpensive wireless tag with a small memory capacity can be obtained.
　次に、本発明の実施例について具体的に説明する。 Next, an embodiment of the present invention will be specifically described.
　＜スリット幅の影響＞
　下記のように実施例１～５、比較例１～２を設定し、磁性シート１０２のスリット３０の幅の変化に応じた通信性能への影響を検証した。 <Influence of slit width>
Examples 1 to 5 and Comparative Examples 1 and 2 were set as follows, and the effect on communication performance according to the change in the width of the slit 30 of the magnetic sheet 102 was verified.
　［実施例１］
　インレイ１０１、厚さ１００μｍの磁性シート１０２、厚さ３８μｍの発泡ＰＥＴ製の誘電層１０３を積層して図１に示すＲＦＩＤタグ１００を作成した。インレイ１０１は、厚さ３８μｍのＰＥＴフィルム上に、１０μｍのアルミシートをドライラミネートで貼り付けたスロットアンテナ２０を形成し、規定の位置にＩＣチップ１０を実装した。ただし、ラベル紙１０５は外した。スロットアンテナ２０のスロット２１のアンテナパターンは、図２に示す形状とした。スロットアンテナ２０とスロット２１の各部の寸法を図６に示す。 [Example 1]
An inlay 101, a magnetic sheet 102 with a thickness of 100 μm, and a dielectric layer 103 made of foamed PET with a thickness of 38 μm were laminated to produce the RFID tag 100 shown in FIG. For the inlay 101, a slot antenna 20 was formed by sticking a 10 μm aluminum sheet on a 38 μm thick PET film by dry lamination, and an IC chip 10 was mounted at a prescribed position. However, the label paper 105 was removed. The antenna pattern of the slot 21 of the slot antenna 20 has the shape shown in FIG. The dimensions of each part of the slot antenna 20 and slot 21 are shown in FIG.
　磁性シート１０２は、次の手順で作成したものを用いた。まず磁性塗料は、磁性フィラーとしてＦｅ－Ｃｒ合金（山陽特殊製鋼株式会社製、「ＦＫＴＥ２３１」）５５．２質量部、バインダー樹脂としてポリエステル系ポリウレタン（荒川化学工業株式会社製、「ユリアーノ２４５６」、重量平均分子量３００００）９．９質量部、有機溶剤としてトルエン２２．６質量部、分散剤としてリン酸ポリエステル系分散剤（ビックケミージャパン株式会社製、「ＢＹＫ－１１１」）０．４質量部、及び、消泡剤として非シリコーン系消泡剤（ビックケミージャパン株式会社製、「ＢＹＫ－１７５２」）０．２質量部を混合して得た。次に、ロール・トゥ・ロール方式により、ポリエステル系合成フィルム（東洋紡株式会社製、「クリスパーＫ１２１１　＃３８μ」）を速度３ｍ／ｍｉｎで搬送しながら、該フィルム上に、コーターを用いて磁気シールド塗料（上記で得られた磁性塗料）によるストライプパターンを形成し、４０℃から８０℃まで温度を上げながら３０ｍの硬化炉を通過させた。これにより、スリット３０入りの磁性シート１０２を作成した。 The magnetic sheet 102 was prepared by the following procedure. First, the magnetic paint consists of 55.2 parts by mass of Fe--Cr alloy (manufactured by Sanyo Special Steel Co., Ltd., "FKTE231") as a magnetic filler, and polyester-based polyurethane (manufactured by Arakawa Chemical Industries, Ltd., "Uriano 2456") as a binder resin. Average molecular weight 30000) 9.9 parts by mass, 22.6 parts by mass of toluene as an organic solvent, 0.4 parts by mass of a phosphate polyester dispersant (manufactured by BYK Chemie Japan Co., Ltd., "BYK-111") as a dispersant, and , and 0.2 parts by mass of a non-silicone antifoaming agent (“BYK-1752” manufactured by BYK Chemie Japan Co., Ltd.) as an antifoaming agent. Next, while conveying a polyester synthetic film (manufactured by Toyobo Co., Ltd., "Crisper K1211 #38μ") at a speed of 3 m/min by a roll-to-roll method, magnetic shielding paint is applied onto the film using a coater. A striped pattern was formed by (the magnetic paint obtained above), and passed through a curing furnace of 30 m while raising the temperature from 40°C to 80°C. Thus, a magnetic sheet 102 with slits 30 was produced.
　磁性シート１０２のスリット３０は、図３に示したように磁性シート１０２のｙ方向の中央を幅方向の中心位置として、ｙ方向の幅が２ｍｍとなるように形成した。 The slit 30 of the magnetic sheet 102 was formed to have a width of 2 mm in the y direction with the center of the magnetic sheet 102 in the y direction as the center position in the width direction, as shown in FIG.
　このように作成したＲＦＩＤタグ１００を、ＳＵＳ板の貼付対象物２００に貼付した状態で、ＲＦＩＤタグ性能検査装置（Ｔａｇｆｏｒｍａｎｃｅ　Ｐｒｏ、Ｖｏｙａｎｔｉｃ社製）を用いて、ＲＦＩＤタグ１００の周波数特性を計測した。計測時の無線通信用電波の測定周波数帯は７００～１２００ＭＨｚとし、ＥＩＲＰ（Ｅｑｕｉｖａｌｅｎｔ　Ｉｓｏｔｒｏｐｉｃａｌｌｙ　Ｒａｄｉａｔｅｄ　Ｐｏｗｅｒ：等価等方輻射電力）は３．２８Ｗとした。 The frequency characteristics of the RFID tag 100 were measured using an RFID tag performance inspection device (Tagformance Pro, manufactured by Voyantic) in a state in which the RFID tag 100 thus produced was attached to the attachment target 200 of the SUS plate. The measurement frequency band of radio waves for wireless communication during measurement was set to 700 to 1200 MHz, and EIRP (Equivalent Isotropically Radiated Power) was set to 3.28W.
　［実施例２］
　磁性シート１０２のスリット３０の幅を５ｍｍとしたこと以外は、実施例１と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 2]
The RFID tag 100 was produced in the same manner as in Example 1 except that the width of the slit 30 of the magnetic sheet 102 was set to 5 mm, and the frequency characteristics were measured.
　［実施例３］
　磁性シート１０２のスリット３０の幅を１０ｍｍとしたこと以外は、実施例１と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 3]
The RFID tag 100 was produced in the same manner as in Example 1, except that the width of the slit 30 of the magnetic sheet 102 was set to 10 mm, and the frequency characteristics were measured.
　［実施例４］
　磁性シート１０２のスリット３０の幅を１８ｍｍとしたこと以外は、実施例１と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 4]
The RFID tag 100 was produced in the same manner as in Example 1, except that the width of the slit 30 of the magnetic sheet 102 was 18 mm, and the frequency characteristics were measured.
　［実施例５］
　磁性シート１０２のスリット３０の幅を２５ｍｍとしたこと以外は、実施例１と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 5]
The RFID tag 100 was produced in the same manner as in Example 1, except that the width of the slit 30 of the magnetic sheet 102 was set to 25 mm, and the frequency characteristics were measured.
　［比較例１］
　磁性シート１０２にスリット３０を設けないこと以外は、実施例１と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Comparative Example 1]
The RFID tag 100 was produced in the same manner as in Example 1, except that the magnetic sheet 102 was not provided with the slit 30, and the frequency characteristics were measured.
　［比較例２］
　磁性シート１０２を除外したこと以外は、実施例１と同様にＲＦＩＤタグ１００を作成した。すなわち、インレイ１０１、厚さ３８μｍの誘電層１０３を積層してＲＦＩＤタグを作成した。また、作成したＲＦＩＤタグについて、実施例１と同様の手法で周波数特性を計測した。 [Comparative Example 2]
An RFID tag 100 was produced in the same manner as in Example 1, except that the magnetic sheet 102 was omitted. That is, an RFID tag was produced by laminating an inlay 101 and a dielectric layer 103 having a thickness of 38 μm. Further, the frequency characteristics of the produced RFID tag were measured in the same manner as in the first embodiment.
　図７は、実施例１～５及び比較例２のＲＦＩＤタグの周波数特性を示す図である。図７中の（Ａ）は実施例１、（Ｂ）は実施例２、（Ｃ）は実施例３、（Ｄ）は実施例４、（Ｅ）は実施例５、（Ｆ）は比較例２の周波数特性を示す。各図の横軸は無線通信用電波の周波数を表し、縦軸はＲＦＩＤタグ１００からリーダまでの通信可能距離を表す。 FIG. 7 is a diagram showing frequency characteristics of RFID tags of Examples 1 to 5 and Comparative Example 2. FIG. In FIG. 7, (A) is Example 1, (B) is Example 2, (C) is Example 3, (D) is Example 4, (E) is Example 5, and (F) is a comparative example. 2 shows the frequency characteristics of FIG. In each figure, the horizontal axis represents the frequency of radio waves for wireless communication, and the vertical axis represents the communicable distance from the RFID tag 100 to the reader.
　図７で特性のグラフが図示されていない周波数帯では、ＲＦＩＤタグ１００とリーダとの間で無線通信を行うことができなかったことを表す。図７（Ｆ）に示すように、磁性シート１０２が無い比較例２では、約８７０ＭＨｚ以下の周波数帯では無線通信を行うことができなかった。なお、図７には図示されていないが、磁性シート１０２にスリット３０を設けない比較例１では、すべての周波数帯において無線通信を行うことができなかった。 　In the frequency band for which the characteristic graph is not shown in FIG. 7, wireless communication could not be performed between the RFID tag 100 and the reader. As shown in FIG. 7F, in Comparative Example 2 without the magnetic sheet 102, wireless communication could not be performed in the frequency band of about 870 MHz or less. Although not shown in FIG. 7, in Comparative Example 1 in which the magnetic sheet 102 is not provided with the slits 30, wireless communication could not be performed in all frequency bands.
　図７に示すように、ＵＨＦ帯に含まれる所定の周波数９２０ＭＨｚのときの通信可能距離は、実施例１では約２．０ｍ、実施例２では約３ｍ、実施例３では約４．５ｍ、実施例４では約４．５ｍ、実施例５では約２．５ｍ、比較例２では約１．５ｍであった。 As shown in FIG. 7, the communicable distance at a predetermined frequency of 920 MHz included in the UHF band is about 2.0 m in Example 1, about 3 m in Example 2, and about 4.5 m in Example 3. Example 4 was about 4.5 m, Example 5 was about 2.5 m, and Comparative Example 2 was about 1.5 m.
　図７（Ａ）～（Ｄ）に示すように、磁性シート１０２にスリット３０を設ける実施例１～４の構成では、スリット３０の幅が増えるにつれて通信可能距離も増大し、スリット幅が１０～１８ｍｍで通信可能距離が最大の約４．５ｍとなる。また、周波数特性のピーク位置は、ＵＨＦ帯の周波数である８６０～９６０ＭＨｚの範囲に含まれる。なお、図７（Ｅ）に示す実施例５では、スリット幅をさらに増やすと、周波数特性のピーク位置が高周波側に移動し、ＵＨＦ帯（例えば９２０ＭＨｚあたり）の通信可能距離が若干低下した。　 As shown in FIGS. 7A to 7D, in the configurations of Examples 1 to 4 in which the slits 30 are provided in the magnetic sheet 102, as the width of the slits 30 increases, the communicable distance also increases. At 18mm, the maximum communicable distance is about 4.5m. Also, the peak position of the frequency characteristics is included in the range of 860 to 960 MHz, which is the frequency of the UHF band. In Example 5 shown in FIG. 7(E), when the slit width was further increased, the peak position of the frequency characteristics moved to the high frequency side, and the communicable distance in the UHF band (for example, around 920 MHz) slightly decreased.　
　また、図７（Ｆ）に示すように、磁性シート１０２が無い比較例２では、周波数特性のピーク位置が、図７（Ｅ）に示す実施例５の場合よりもさらに高周波側に大きく移動していた。比較例２では、ＵＨＦ帯で使用するためにはアンテナサイズを大きくする必要がある。 Further, as shown in FIG. 7(F), in Comparative Example 2 without the magnetic sheet 102, the peak position of the frequency characteristics moves further to the high frequency side than in the case of Example 5 shown in FIG. 7(E). was In Comparative Example 2, it is necessary to increase the size of the antenna for use in the UHF band.
　図７に示した試験結果より、ＲＦＩＤタグ１００に磁性シート１０２を設け、さらに磁性シートにスリット３０を設けることにより、通信可能距離を増やすことができ、特にＵＨＦ帯の通信可能距離を増やすことができることが示された。 From the test results shown in FIG. 7, by providing the magnetic sheet 102 in the RFID tag 100 and further providing the slit 30 in the magnetic sheet, the communicable distance can be increased, and in particular, the communicable distance in the UHF band can be increased. shown that it can be done.
　さらに、図６に示した各部寸法のスロットアンテナ２０に対しては、スリット３０の幅を１０～１８ｍｍとすると、通信可能距離を最大にできることが示された。つまり、スリット３０の幅には最適な範囲があることが示された。この条件をスロットアンテナ２０のスロット２１との関係で表現すると、スリット３０の範囲内にスロット２１の平行部２２が完全に包含される場合から、スリット３０にスロット２１の平行部２２及び垂直部２３の全体が完全に包含され、スリット３０の幅が垂直部２３の長さをほぼ一致する場合まで、とも表現できる。 Furthermore, it has been shown that for the slot antenna 20 having the dimensions of each part shown in FIG. 6, the communicable distance can be maximized by setting the width of the slit 30 to 10 to 18 mm. In other words, it was shown that the width of the slit 30 has an optimum range. Expressing this condition in relation to the slot 21 of the slot antenna 20 , since the parallel portion 22 of the slot 21 is completely included in the range of the slit 30 , the parallel portion 22 and the vertical portion 23 of the slot 21 are in the slit 30 . is completely included and the width of the slit 30 substantially matches the length of the vertical portion 23.
　＜磁性シートの磁性特性の影響＞
　下記のように実施例６～９を設定し、磁性シート１０２の磁性特性、具体的には磁性粉の割合の変化に応じた通信性能への影響を検証した。 <Influence of Magnetic Properties of Magnetic Sheet>
Examples 6 to 9 were set as follows, and the magnetic properties of the magnetic sheet 102, specifically, the influence on the communication performance according to the change in the ratio of the magnetic powder was verified.
　［実施例６］
　磁性シート１０２の幅は、上記の実施例１～５のうち最適な範囲に含まれる１８ｍｍとした。磁性シート１０２の磁性層１０２Ａは、磁性粉の割合が１００％、誘電粉の割合が０％のものとした。その他の条件は上記の実施例１と同様としてＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 6]
The width of the magnetic sheet 102 was set to 18 mm, which is within the optimum range among Examples 1 to 5 above. The magnetic layer 102A of the magnetic sheet 102 has a magnetic powder ratio of 100% and a dielectric powder ratio of 0%. The RFID tag 100 was produced under the same conditions as in Example 1 above, and the frequency characteristics were measured.
　［実施例７］
　磁性シート１０２の磁性層１０２Ａを、磁性粉の割合が７０％、誘電粉の割合が３０％のものとしたこと以外は、実施例６と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 7]
An RFID tag 100 was produced in the same manner as in Example 6 except that the magnetic layer 102A of the magnetic sheet 102 had a magnetic powder ratio of 70% and a dielectric powder ratio of 30%, and the frequency characteristics were measured. did.
　［実施例８］
　磁性シート１０２の磁性層１０２Ａを、磁性粉の割合が３０％、誘電粉の割合が７０％のものとしたこと以外は、実施例６と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 8]
The RFID tag 100 was produced in the same manner as in Example 6 except that the magnetic layer 102A of the magnetic sheet 102 had a magnetic powder ratio of 30% and a dielectric powder ratio of 70%, and the frequency characteristics were measured. did.
　［実施例９］
　磁性シート１０２の磁性層１０２Ａを、磁性粉の割合が０％、誘電粉の割合が１００％のものとしたこと以外は、実施例６と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 9]
An RFID tag 100 was produced in the same manner as in Example 6 except that the magnetic layer 102A of the magnetic sheet 102 had a magnetic powder ratio of 0% and a dielectric powder ratio of 100%, and the frequency characteristics were measured. did.
　図８は、実施例６～９のＲＦＩＤタグの周波数特性を示す図である。図８中の（Ａ）は実施例６、（Ｂ）は実施例７、（Ｃ）は実施例８、（Ｄ）は実施例９の周波数特性を示す
。各図の概要は、図７と同様である。 FIG. 8 is a diagram showing frequency characteristics of RFID tags of Examples 6 to 9. FIG. In FIG. 8, (A) shows the frequency characteristics of the sixth embodiment, (B) the seventh embodiment, (C) the eighth embodiment, and (D) the ninth embodiment. The outline of each figure is the same as that of FIG.
　図８に示すように、ＵＨＦ帯に含まれる所定の周波数９２０ＭＨｚのときの通信可能距離は、実施例６では約４．５ｍ、実施例７では約３．５ｍ、実施例８では約２．５ｍ、実施例９では約１．８ｍであった。また、周波数特性のピークの位置は、実施例６では約９００～９６０ＭＨｚであり、実施例７では約９４０～１０２５ＭＨｚであり、実施例８では約１０１０～１０６０ＭＨｚであり、実施例９では約１０１０ＭＨｚ付近であった。 As shown in FIG. 8, the communicable distance at a predetermined frequency of 920 MHz included in the UHF band is about 4.5 m in Example 6, about 3.5 m in Example 7, and about 2.5 m in Example 8. , and about 1.8 m in Example 9. Further, the position of the peak of the frequency characteristics is about 900 to 960 MHz in Example 6, about 940 to 1025 MHz in Example 7, about 1010 to 1060 MHz in Example 8, and about 1010 MHz in Example 9. Met.
　図８に示した試験結果より、磁性シート１０２の磁性層１０２Ａの組成において、磁性粉の割合が多いほど、共振周波数を低周波数側に移動させることができると考えられる。共振周波数を低周波数側に移動させることができるということは、アンテナの小型化が図れるということである。磁性シートの組成において磁性粉の割合を増やすことにより、より小さく、薄いＲＦＩＤタグ１００を実現できると考えられる。また、図８に示した試験結果より、磁性粉の割合を増やすほど、周波数特性のピークとＵＨＦ帯とが重なる範囲が増えるので、ＵＨＦ帯における通信可能距離を改善でき、ＲＦＩＤタグ１００の通信性能を向上できることが示された。 From the test results shown in FIG. 8, it is considered that the higher the ratio of the magnetic powder in the composition of the magnetic layer 102A of the magnetic sheet 102, the more the resonance frequency can be shifted to the lower frequency side. The fact that the resonance frequency can be moved to the low frequency side means that the size of the antenna can be reduced. It is believed that a smaller and thinner RFID tag 100 can be realized by increasing the proportion of magnetic powder in the composition of the magnetic sheet. In addition, from the test results shown in FIG. 8, as the ratio of the magnetic powder is increased, the range where the peak of the frequency characteristics and the UHF band overlap increases, so the communicable distance in the UHF band can be improved, and the communication performance of the RFID tag 100 can be improved.
　＜誘電層の影響＞
　下記のように実施例１０～１３を設定し、誘電層１０３の有無に応じた通信性能への影響を検証した。 <Influence of dielectric layer>
Examples 10 to 13 were set as follows, and the influence on communication performance depending on the presence or absence of the dielectric layer 103 was verified.
　［実施例１０］
　上記の実施例５と同様に、磁性シート１０２のスリット３０の幅を２５ｍｍとし、磁性シート１０２の厚さを１００μｍとして、ＲＦＩＤタグ１００を作成した。作成したＲＦＩＤタグ１００をスチール製ロッカーに貼付して、既製品のハンディリーダ（商品名：ＡｓＲｅａｄｅｒＧＵＮ、アスタリスク社製、出力１Ｗ）を用い、通信可能距離を計測した。 [Example 10]
As in Example 5 above, the RFID tag 100 was produced by setting the width of the slit 30 of the magnetic sheet 102 to 25 mm and the thickness of the magnetic sheet 102 to 100 μm. The produced RFID tag 100 was attached to a steel locker, and the communicable distance was measured using an off-the-shelf handy reader (trade name: AsReaderGUN, manufactured by Asterisk, output 1 W).
　［実施例１１］
　誘電層１０３を除外したこと以外は、実施例１０と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 11]
The RFID tag 100 was produced in the same manner as in Example 10, except that the dielectric layer 103 was omitted, and the frequency characteristics were measured.
　［実施例１２］
　磁性シート１０２の厚さを２００μｍとしたこと以外は、実施例１０と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 12]
The RFID tag 100 was produced in the same manner as in Example 10, except that the thickness of the magnetic sheet 102 was 200 μm, and the frequency characteristics were measured.
　［実施例１３］
　誘電層１０３を除外したこと以外は、実施例１２と同様にＲＦＩＤタグ１００を作成して、周波数特性を計測した。 [Example 13]
The RFID tag 100 was produced in the same manner as in Example 12, except that the dielectric layer 103 was omitted, and the frequency characteristics were measured.
　表１に、実施例１０～１３のＲＦＩＤタグの通信距離の計測結果を示す。 Table 1 shows the measurement results of the communication distances of the RFID tags of Examples 10-13.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、磁性シート１０２の厚さが１００μｍで共通する実施例１０、１１では、誘電層１０３を備える実施例１０のほうが通信可能距離を増大できる。また、磁性シート１０２の厚さが２００μｍで共通する実施例１２、１３でも、誘電層１０３を備える実施例１２のほうが通信可能距離を増大できる。以上より、磁性シート１０２の厚さの変化によらず、ＲＦＩＤタグに誘電層１０３を設けるほうが通信性能を向上できることが示された。 As shown in Table 1, in Examples 10 and 11 in which the thickness of the magnetic sheet 102 is 100 μm, Example 10 provided with the dielectric layer 103 can increase the communicable distance. Moreover, even in the twelfth and thirteenth embodiments in which the thickness of the magnetic sheet 102 is 200 μm, the twelfth embodiment having the dielectric layer 103 can increase the communicable distance. From the above, it was shown that the communication performance can be improved by providing the dielectric layer 103 to the RFID tag regardless of the change in the thickness of the magnetic sheet 102 .
　＜スロットアンテナの形状の影響＞
　下記のように実施例１４～１９を設定し、スロットアンテナ２０の形状の変化に応じた通信性能への影響を検証した。具体的には、スロットアンテナ２０の形状をシミュレータで変化させて、インピーダンスの変化を確認した。 <Influence of shape of slot antenna>
Examples 14 to 19 were set as follows, and the effect on communication performance according to the change in the shape of the slot antenna 20 was verified. Specifically, the shape of the slot antenna 20 was changed using a simulator, and changes in impedance were confirmed.
　［実施例１４］
　図９は、実施例１４で用いたスロットアンテナ２０－１の形状を示す図である。シミュレータ上で図９に示す形状のスロットアンテナ２０－１のモデルを作成した。なお、図９に示すスロットアンテナ２０－１の形状や各部寸法は、図６に示した実施例１などで形成したスロットアンテナ２０のものと同一である。このように作成したスロットアンテナ２０－１のモデルを用いて、シミュレータ上でインピーダンスの計測を行った。 [Example 14]
FIG. 9 is a diagram showing the shape of the slot antenna 20-1 used in the fourteenth embodiment. A model of the slot antenna 20-1 having the shape shown in FIG. 9 was created on the simulator. The shape and dimensions of each part of the slot antenna 20-1 shown in FIG. 9 are the same as those of the slot antenna 20 formed in Example 1 shown in FIG. Using the model of the slot antenna 20-1 created in this way, the impedance was measured on a simulator.
　図１０は、実施例１４のスロットアンテナ２０－１のインピーダンス特性の計測結果を示す図である。図１０の縦軸は、インピーダンスの実数と虚数の値を示す。図１０の横軸は周波数［ＭＨｚ］を示す。図１０に示す一点鎖線のグラフ（プロットが丸のグラフ）は各周波数に対応するインピーダンスの実数をプロットしたものである。図１０に示す実線のグラフ（プロットが四角のグラフ）は各周波数に対応するインピーダンスの虚数をプロットしたものである。 FIG. 10 is a diagram showing the measurement results of the impedance characteristics of the slot antenna 20-1 of Example 14. FIG. The vertical axis in FIG. 10 indicates the values of real and imaginary impedances. The horizontal axis of FIG. 10 indicates frequency [MHz]. The dashed-dotted line graph (plotted with circles) shown in FIG. 10 plots the real number of the impedance corresponding to each frequency. The solid-line graph (graph with square plots) shown in FIG. 10 plots the imaginary number of the impedance corresponding to each frequency.
　［実施例１５］
　図１１は、実施例１５で用いたスロットアンテナ２０－２の形状を示す図である。実施例１５のスロットアンテナ２０－２では、スロット２１の平行部２２の長さが実施例１４のスロットアンテナ２０－１のものより短くなるよう、スロット２１が形成されている。このように作成したスロットアンテナ２０－２のモデルを用いて、シミュレータ上でインピーダンスの計測を行った。図１２は、実施例１５のスロットアンテナ２０－２のインピーダンス特性の計測結果を示す図である。図１２の概要は図１０と同様である。 [Example 15]
FIG. 11 is a diagram showing the shape of the slot antenna 20-2 used in the fifteenth embodiment. In the slot antenna 20-2 of the fifteenth embodiment, the slot 21 is formed such that the length of the parallel portion 22 of the slot 21 is shorter than that of the slot antenna 20-1 of the fourteenth embodiment. Using the model of the slot antenna 20-2 created in this way, the impedance was measured on a simulator. FIG. 12 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-2 of the fifteenth embodiment. The outline of FIG. 12 is similar to that of FIG.
　［実施例１６］
　図１３は、実施例１６で用いたスロットアンテナ２０－３の形状を示す図である。実施例１６のスロットアンテナ２０－３では、スロット２１の平行部２２の長さが実施例１５のスロットアンテナ２０－２のものよりさらに短くなるよう、スロット２１が形成されている。このように作成したスロットアンテナ２０－３のモデルを用いて、シミュレータ上でインピーダンスの計測を行った。図１４は、実施例１６のスロットアンテナ２０－３のインピーダンス特性の計測結果を示す図である。図１４の概要は図１０と同様である。 [Example 16]
FIG. 13 is a diagram showing the shape of the slot antenna 20-3 used in the sixteenth embodiment. In the slot antenna 20-3 of the sixteenth embodiment, the slot 21 is formed such that the length of the parallel portion 22 of the slot 21 is shorter than that of the slot antenna 20-2 of the fifteenth embodiment. Using the model of the slot antenna 20-3 created in this way, the impedance was measured on a simulator. FIG. 14 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-3 of the sixteenth embodiment. The outline of FIG. 14 is similar to that of FIG.
　［実施例１７］
　図１５は、実施例１７で用いたスロットアンテナ２０－４の形状を示す図である。実施例１７のスロットアンテナ２０－４では、スロット２１の垂直部２３を無くし、平行部２２のみとなるよう、スロット２１が形成されている。スロット２１の平行部２２の長さは、実施例１４のスロットアンテナ２０－１のものと同一である。このように作成したスロットアンテナ２０－４のモデルを用いて、シミュレータ上でインピーダンスの計測を行った。図１６は、実施例１７のスロットアンテナ２０－４のインピーダンス特性の計測結果を示す図である。図１６の概要は図１０と同様である。 [Example 17]
FIG. 15 is a diagram showing the shape of the slot antenna 20-4 used in the seventeenth embodiment. In the slot antenna 20-4 of Example 17, the slot 21 is formed so that the vertical portion 23 of the slot 21 is eliminated and only the parallel portion 22 is provided. The length of the parallel portion 22 of the slot 21 is the same as that of the slot antenna 20-1 of the fourteenth embodiment. Using the model of the slot antenna 20-4 created in this way, the impedance was measured on a simulator. FIG. 16 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-4 of the seventeenth embodiment. The outline of FIG. 16 is similar to that of FIG.
　［実施例１８］
　図１７は、実施例１８で用いたスロットアンテナ２０－５の形状を示す図である。実施例１８のスロットアンテナ２０－５では、スロット２１の平行部２２の幅が実施例１７のスロットアンテナ２０－４のものより大きくなるようスロット２１が形成されている。このように作成したスロットアンテナ２０－５のモデルを用いて、シミュレータ上でインピーダンスの計測を行った。図１８は、実施例１８のスロットアンテナ２０－５のインピーダンス特性の計測結果を示す図である。図１８の概要は図１０と同様である。 [Example 18]
FIG. 17 is a diagram showing the shape of the slot antenna 20-5 used in the eighteenth embodiment. In the slot antenna 20-5 of the eighteenth embodiment, the slot 21 is formed such that the width of the parallel portion 22 of the slot 21 is larger than that of the slot antenna 20-4 of the seventeenth embodiment. Using the model of the slot antenna 20-5 created in this way, the impedance was measured on a simulator. FIG. 18 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-5 of the eighteenth embodiment. The outline of FIG. 18 is similar to that of FIG.
　［実施例１９］
　図１９は、実施例１９で用いたスロットアンテナ２０－６の形状を示す図である。実施例１９のスロットアンテナ２０－６は、短手方向（ｙ方向）の寸法が実施例１４のスロットアンテナ２０－１のものより短くなるよう形成されている。スロット２１の形状は実施例１４のスロットアンテナ２０－１のものと同一である。このように作成したスロットアンテナ２０－６モデルを用いて、シミュレータ上でインピーダンスの計測を行った。図２０は、実施例１９のスロットアンテナ２０－６のインピーダンス特性の計測結果を示す図である。図２０の概要は図１０と同様である。 [Example 19]
FIG. 19 is a diagram showing the shape of the slot antenna 20-6 used in the nineteenth embodiment. The slot antenna 20-6 of the nineteenth embodiment is formed so that the dimension in the lateral direction (y direction) is shorter than that of the slot antenna 20-1 of the fourteenth embodiment. The shape of the slot 21 is the same as that of the slot antenna 20-1 of the fourteenth embodiment. Using the slot antenna 20-6 model created in this way, the impedance was measured on a simulator. FIG. 20 is a diagram showing measurement results of impedance characteristics of the slot antenna 20-6 of Example 19. In FIG. The outline of FIG. 20 is similar to that of FIG.
　各実施例１４～１９の比較検証は、上記実施例１などで用いた実物のスロットアンテナ２０の形状や各部寸法と同一である実施例１４のスロットアンテナ２０－１のインピーダンス特性を基準として行った。例えば、実施例１４と同様のインピーダンス特性の実施例では、当該実施例の形状で実際にアンテナを製造したものでも、実施例１などの実物のスロットアンテナ２０と同様の性能が得られると仮定した。 Comparative verification of each of Examples 14 to 19 was performed based on the impedance characteristics of the slot antenna 20-1 of Example 14, which has the same shape and dimensions as the actual slot antenna 20 used in Example 1 and the like. . For example, in the example having the same impedance characteristics as in Example 14, it was assumed that even if the antenna was actually manufactured in the shape of the example, the performance similar to that of the actual slot antenna 20 such as Example 1 could be obtained. .
　実施例１４～１６を比較すると、図１０、図１２、図１４に示すように、スリット３０の平行部２２の長さ、つまりスリット３０の長手方向（ｘ方向）の長さを変更すると、スロットアンテナのインピーダンス特性が大きく変化していることがわかる。一方、実施例１４と、実施例１７、１８とを比較すると、図１０、図１６、図１８に示すように、スリットの垂直部２３を無くしたり、平行部２２の幅を増やすなど、スリット３０の短手方向（ｙ方向）の長さを変更しても、シミュレーション上ではスロットアンテナのインピーダンス特性にはほとんど変化が見られなかった。同様に、実施例１４と実施例１９を比較すると、図１０、図２０に示すように、スリットアンテナの短手方向（ｙ方向）の寸法を変更しても、スロットアンテナのインピーダンス特性にはほとんど変化が見られなかった。　 Comparing Examples 14 to 16, as shown in FIGS. 10, 12, and 14, when the length of the parallel portion 22 of the slit 30, that is, the length of the slit 30 in the longitudinal direction (x direction) is changed, the slot It can be seen that the impedance characteristics of the antenna change greatly. On the other hand, when comparing Example 14 with Examples 17 and 18, as shown in FIGS. Even if the length in the lateral direction (y direction) of the slot antenna was changed, almost no change was observed in the impedance characteristics of the slot antenna on the simulation. Similarly, comparing Example 14 and Example 19, as shown in FIGS. No change was seen.　
　以上より、シミュレーション上で、スリット３０の長手方向（ｘ方向）の長さがスロットアンテナのアンテナ特性に重要であることが示された。 From the above, it was shown in the simulation that the length of the slit 30 in the longitudinal direction (x direction) is important for the antenna characteristics of the slot antenna.
　図２２は、上述した本実施の形態における、実施例１のＲＦＩＤタグについて、貼付対象物２００としての各金属種への影響について評価した結果を示す図である。ただし、本評価に当たっては、ラベル紙１０５は使用せず、タブの両端を金属板に粘着テープで固定して、評価した。 FIG. 22 is a diagram showing the results of evaluating the influence of the RFID tag of Example 1 on each kind of metal as the attachment target 200 in the present embodiment described above. However, in this evaluation, the label paper 105 was not used, and both ends of the tab were fixed to a metal plate with an adhesive tape.
　図２２の評価結果から明らかなように、本実施の形態のＲＦＩＤタグは各金属種に対し良好な通信性能を発揮できる。 As is clear from the evaluation results in FIG. 22, the RFID tag of this embodiment can exhibit good communication performance for each metal type.
　以上、具体例を参照しつつ本実施形態について説明した。しかし、本開示はこれらの具体例に限定されるものではない。これら具体例に、当業者が適宜設計変更を加えたものも、本開示の特徴を備えている限り、本開示の範囲に包含される。前述した各具体例が備える各要素およびその配置、条件、形状などは、例示したものに限定されるわけではなく適宜変更することができる。前述した各具体例が備える各要素は、技術的な矛盾が生じない限り、適宜組み合わせを変えることができる。 The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above and its arrangement, conditions, shape, etc. are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.
　本国際出願は２０２１年３月１２日に出願された日本国特許出願２０２１－０４０６６４号に基づく優先権を主張するものであり、２０２１－０４０６６４号の全内容をここに本国際出願に援用する。 This international application claims priority based on Japanese Patent Application No. 2021-040664 filed on March 12, 2021, and the entire contents of No. 2021-040664 are hereby incorporated into this international application.
　１００　　ＲＦＩＤタグ
　１０１　　インレイ
　　１０　　ＩＣチップ
　　２０　　スロットアンテナ
　　２１　　スロット
　　２２　　一対の平行部
　　２３　　一対の垂直部
　１０２　　磁性シート
　　３０　　スリット
　１０３　　誘電層
　２００　　貼付対象物 REFERENCE SIGNS LIST 100 RFID tag 101 inlay 10 IC chip 20 slot antenna 21 slot 22 pair of parallel parts 23 pair of vertical parts 102 magnetic sheet 30 slit 103 dielectric layer 200 attachment object

Claims (9)

  1. 　貼付対象物に貼付されるＲＦＩＤタグであって、
    　識別情報が記録されるＩＣチップと、前記ＩＣチップに接続されるスロットアンテナと、を有するインレイと、
    　前記インレイの前記貼付対象物側に積層される磁性シートと、
    を備え、
    　前記スロットアンテナは金属薄膜で形成され、
    　前記スロットアンテナには、前記金属薄膜の一部が細長く切り抜かれたスロットが設けられ、
    　前記磁性シートには、磁性特性を有する磁性層を区分するスリットが設けられ、
    　前記スリットは、前記磁性シートと前記インレイとが積層された状態で、前記インレイの前記スロットと重なる領域に配置される、
    ＲＦＩＤタグ。     An RFID tag affixed to an affixed object,
    an inlay having an IC chip on which identification information is recorded and a slot antenna connected to the IC chip;
    a magnetic sheet laminated on the inlay on the side of the object to be adhered;
    with
    The slot antenna is formed of a metal thin film,
    The slot antenna is provided with a slot obtained by cutting a part of the metal thin film into an elongated shape,
    The magnetic sheet is provided with slits that separate the magnetic layers having magnetic properties,
    The slit is arranged in a region where the magnetic sheet and the inlay are stacked and overlaps the slot of the inlay.
    RFID tag.
  2. 　前記磁性シートの前記貼付対象物側にさらに積層される誘電層を備える、
    請求項１に記載のＲＦＩＤタグ。     A dielectric layer further laminated on the side of the object to be adhered of the magnetic sheet,
    The RFID tag according to claim 1.
  3. 　前記貼付対象物は金属である、
    請求項１に記載のＲＦＩＤタグ。     The object to be attached is metal,
    The RFID tag according to claim 1.
  4. 　前記インレイの主面の中央に前記ＩＣチップが配置され、
    　前記スロットアンテナの前記スロットは、前記ＩＣチップを挟んで所定方向に平行に延在する一対の平行部を有する、
    請求項１に記載のＲＦＩＤタグ。     The IC chip is arranged in the center of the main surface of the inlay,
    The slot of the slot antenna has a pair of parallel portions extending in parallel in a predetermined direction with the IC chip sandwiched therebetween,
    The RFID tag according to claim 1.
  5. 　前記スロットは、前記一対の平行部と直交する方向に延在する垂直部を有する、
    請求項４に記載のＲＦＩＤタグ。     The slot has a vertical portion extending in a direction orthogonal to the pair of parallel portions,
    The RFID tag according to claim 4.
  6. 　前記スリットは、前記磁性シートと前記インレイとが積層された状態で、前記インレイの前記スロットの前記一対の平行部の全体が前記スリットの領域に含まれるように形成される、
    請求項４に記載のＲＦＩＤタグ。     The slit is formed such that the entire pair of parallel portions of the slot of the inlay is included in the region of the slit in a state in which the magnetic sheet and the inlay are laminated.
    The RFID tag according to claim 4.
  7. 　使用周波数がＵＨＦ帯の周波数である請求項１～５のいずれか１項に記載のＲＦＩＤタグ。 The RFID tag according to any one of claims 1 to 5, wherein the frequency used is a UHF band frequency.
  8. 　電波式の無線タグである請求項１に記載のＲＦＩＤタグ。 The RFID tag according to claim 1, which is a radio wave type wireless tag.
  9. 　磁性特性を有する磁性層を区分するスリットが設けられた磁性シートを形成するステップと、
    　識別情報が記録されるＩＣチップと、前記ＩＣチップに接続されるスロットアンテナと、を有するインレイと、前記形成するステップにて形成された前記磁性シートを積層するステップと、
    を含み、
    　前記スロットアンテナは金属薄膜で形成され、
    　前記スロットアンテナには、前記金属薄膜の一部が細長く切り抜かれたスロットが設けられ、
    　前記スリットは、前記磁性シートと前記インレイとが積層された状態で、前記インレイの前記スロットと重なる領域に配置される、
    ＲＦＩＤタグの製造方法。     forming a magnetic sheet with slits separating magnetic layers having magnetic properties;
    laminating an inlay having an IC chip on which identification information is recorded and a slot antenna connected to the IC chip, and the magnetic sheet formed in the forming step;
    including
    The slot antenna is formed of a metal thin film,
    The slot antenna is provided with a slot obtained by cutting a part of the metal thin film into an elongated shape,
    The slit is arranged in a region where the magnetic sheet and the inlay are stacked and overlaps the slot of the inlay.
    A method for manufacturing an RFID tag.
PCT/JP2022/010424 2021-03-12 2022-03-09 Rfid tag and rfid tag manufacturing method WO2022191258A1 (en)

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JP3120051U (en) * 2005-12-27 2006-03-23 タック化成株式会社 RFID label with magnetic sheet
JP2007195153A (en) * 2006-01-16 2007-08-02 Samsung Electro-Mechanics Co Ltd Wideband chip antenna
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JP2010056683A (en) * 2008-08-26 2010-03-11 Nitta Ind Corp Wireless ic tag and wireless communication system
JP2013026860A (en) * 2011-07-21 2013-02-04 Smart:Kk Universal ic tag, its manufacturing method, and communication management system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01170202A (en) * 1987-12-25 1989-07-05 Sumitomo Electric Ind Ltd Slot antenna for twisted pair type leakage cable
JP2005210676A (en) * 2003-12-25 2005-08-04 Hitachi Ltd Wireless ic tag, and method and apparatus for manufacturing the same
JP2008523768A (en) * 2004-12-14 2008-07-03 インテル コーポレイション Slot antenna with MEMS varactor for resonant frequency tuning
JP3120051U (en) * 2005-12-27 2006-03-23 タック化成株式会社 RFID label with magnetic sheet
JP2007195153A (en) * 2006-01-16 2007-08-02 Samsung Electro-Mechanics Co Ltd Wideband chip antenna
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JP2014127751A (en) * 2012-12-25 2014-07-07 Smart:Kk Antenna, communication management system and communication system

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