EP2063489A1 - Antennenelement und verfahren zu seiner herstellung - Google Patents

Antennenelement und verfahren zu seiner herstellung Download PDF

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Publication number
EP2063489A1
EP2063489A1 EP07792377A EP07792377A EP2063489A1 EP 2063489 A1 EP2063489 A1 EP 2063489A1 EP 07792377 A EP07792377 A EP 07792377A EP 07792377 A EP07792377 A EP 07792377A EP 2063489 A1 EP2063489 A1 EP 2063489A1
Authority
EP
European Patent Office
Prior art keywords
antenna
antenna device
magnetic element
laminar
wiring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07792377A
Other languages
English (en)
French (fr)
Other versions
EP2063489A4 (de
Inventor
Takashi Hasunuma
Keiichiro Nomura
Arata Tanaka
Takaki Naito
Takeshi Kimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tyco Electronics Raychem KK
Tyco Electronics Japan GK
Original Assignee
Tyco Electronics AMP KK
Tyco Electronics Raychem KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tyco Electronics AMP KK, Tyco Electronics Raychem KK filed Critical Tyco Electronics AMP KK
Publication of EP2063489A1 publication Critical patent/EP2063489A1/de
Publication of EP2063489A4 publication Critical patent/EP2063489A4/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • 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
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • the present invention relates to an antenna device, in particular an antenna device that may be used in an apparatus used in an RFID (Radio Frequency Identification) system, for example an antenna device that can be used in an IC tag or an antenna device used in a reader/writer.
  • an electronic apparatus such as a wireless tag or an IC tag (which also may be a cell-phone), having such an antenna device, as well as a reader/writer used for transmission therewith.
  • the antenna which tags, readers/writers or the like as units for forming the RFID systems include.
  • the antenna is used in signal transmission and/or power supply by utilizing the electromagnetic induction effect.
  • Such an antenna is known to be greatly influenced by the environment in which it is placed.
  • an eddy current caused by the magnetic flux generated by the antenna flows on the metal surface in the reader/writer.
  • carrier waves are significantly attenuated, and with respect to the tag, the intensity of the magnetic flux flowing through the antenna is attenuated, which may make communication impossible.
  • a member formed of a magnetic material with the antenna has been proposed.
  • a non-contact type IC card reader/writer provided with a magnetic material in the form of a flexible sheet under the antenna has been proposed in order to prevent the adverse effects to the communication caused by the metallic article as well as to reduce occupied space (see Patent Reference 1 below).
  • the antenna and the magnetic material in the form of the sheet are bonded with double-sided adhesive tape.
  • a non-contact type data transmitter having an antenna and an IC chip provided on one surface of a base substrate wherein a magnetic material layer is placed so as to cover at least one of the antenna and the IC chip, has been proposed (see Patent Reference 2 below).
  • Patent Reference 2 a non-contact type data transmitter, having an antenna and an IC chip provided on one surface of a base substrate wherein a magnetic material layer is placed so as to cover at least one of the antenna and the IC chip.
  • This data transmitter is manufactured by pasting together a metal foil on a base material, after which the conductive foil is etched to form an antenna pattern, the IC chip is mounted, and finally the magnetic material is coated, and dried to be solidified.
  • the RFID systems are expected to be more widely used in portable electronic apparatuses such as cell-phones.
  • the antenna device contained in the tag, the reader/writer, or the like provided which forms the system is made more compact; it is also desirable that the antenna may be more easily manufactured.
  • an antenna device comprising:
  • the present invention provides a method of manufacturing an antenna device having a laminar magnetic element and antenna wiring provided thereon, the method comprising:
  • the present invention also provides an electronic apparatuses having an antenna device as described above and below, in particular an IC tag, a portable electronic apparatus having the IC tag (for example a cell-phone, a notebook PC, a PDA (Personal Digital Assistants), etc.), and a reader/writer used in transmission with the IC tag.
  • an IC tag for example a cell-phone, a notebook PC, a PDA (Personal Digital Assistants), etc.
  • a reader/writer used in transmission with the IC tag.
  • the antenna device of the present invention has the antenna wiring attached directly to the laminar magnetic element. Therefore, there is nothing between the antenna wiring and the laminar magnetic element (for example, a double-sided adhesive tape or a resin layer derived from an adhesive), and further other elements such as a base substrate is not required, so that the antenna device may be formed to be thinner and therefore more compact.
  • the laminar magnetic element for example, a double-sided adhesive tape or a resin layer derived from an adhesive
  • the metal foil is bonded directly to the laminar magnetic element, after which the laminar magnetic element having the antenna wiring is obtained by etching, bonding of the metal foil to the laminar magnetic element is simplified.
  • the antenna device is manufactured more easily.
  • Figure 1 shows the antenna device of the present invention in a schematic perspective view.
  • Figure 2 shows a schematic flowchart of the manufacturing method of the antenna device according to the present invention.
  • the antenna device 10 of the present invention comprises a laminar magnetic element 20 formed of a magnetic composition containing a magnetic material(s) and a polymer material(s), and an antenna wiring 30 provided on one surface of the laminar magnetic element 20.
  • the laminar magnetic element 20 may be of any appropriate form having a planar expanse, and may for example be in a plate form, a sheet form, a film form, or the like.
  • the term "surface” in the present description is intended to mean a surface which defines such expanse, namely a main surface.
  • the laminar magnetic element 30 has two surfaces on its both sides. Therefore, the antenna device according to the present invention includes an embodiment which has the antenna wiring on one side of the laminar magnetic element as well as an embodiment which has the antenna wirings on the both sides of the laminar magnetic element.
  • Various magnetic materials which have been proposed as being able to exhibit the antenna functions in the antenna device may be used as the magnetic material which forms the laminar magnetic element.
  • the use of materials having the ability to converge magnetic flux, in other words materials with superior magnetic permeability, is desirable.
  • magnétique materials examples are: iron-silicon alloys; magnetic materials referred to as ferrites, in particular Mn-Zn ferrites, Ni-Zn ferrites; iron-nickel alloys, in particular permalloys, Sendust alloys; amorphous alloys, preferably magnetic materials referred to as iron-base amorphous alloys, in particular those having Fe as the main component with Si, B, Cu, and Nb added. More specifically, IRL (trade name of TDK Corporation) sold commercially by TDK Corporation as a composite electromagnetic shield material, Finemet commercially available from Hitachi Metals, Ltd. and the like may be used. Such magnetic materials may be in any appropriate form, and may for example be in granular form or flake form.
  • the antenna functions in the antenna device may be used as the polymer material forming the laminar magnetic element.
  • the use of polymer materials that will not adversely affect, or will favorably affect the magnetic materials having the ability to converge the magnetic flux is desirable.
  • the polymer materials preferably used may be either crystalline polymers or non-crystalline polymers, for example, thermoplastic polymers such as a polyethylene (PE), a polyethylene chloride, a polyphenylene sulfide (PPS), a polypropylene, polyvinyl chloride, a polyvinylidene fluoride, a polystyrene, a polyoxymethylene, an ethylene-vinyl acetate copolymer (EVA), an ethylene-butyl acrylate copolymer (EBA), a polyethylene terephthalate (PET), a Nylon, an acrylonitrile-butadiene-styrene terpolymer (ABS) and the like.
  • Thermoplastic elastomers may also be used as the polymer material.
  • the magnetic composition comprising the magnetic materials and polymer materials described above may comprise these materials in any appropriate ratio as long as the antenna device of the present invention is able to exhibit the antenna functions.
  • the magnetic composition comprises 60-95 parts by mass of the magnetic material and 40-5 parts by mass of the polymer materials, more preferably 75-92 parts by mass of the magnetic material and 25-8 parts by mass of the polymer material.
  • the magnetic composition may, as required, contain additional components (for example, a plasticizer for the polymer material (for example, a paraffin chloride, an epoxidized soybean oil, an olefin-based wax), organic/inorganic flame retardant, etc.).
  • the antenna wiring 30 is provided on, for example, one surface of the laminar magnetic element 20 as shown in the drawing.
  • the antenna wirings may be provided on the both sides of the laminar magnetic element.
  • the antenna wiring(s) 30 is bonded directly to the laminar magnetic element 20.
  • the term "on the surface” means that the antenna wiring protrudes from the surface of the laminar magnetic element.
  • the term “directly” means that the antenna wiring and the laminar magnetic element are connected while they are in mutual contact, in other words connected directly.
  • the antenna wiring may be of any appropriate shape, for example a spiral shape (a rectangular spiral shape) as illustrated.
  • the other shape such as a loop shape, a helical shape, a monopole shape, a dipole shape, a patch shape, a slot shape or the like may be possible.
  • the antenna device of the present invention may, in addition to the antenna wiring, have a required electronic component (an IC chip, a capacitor, a chip resistor and the like) and any other wiring required to connect therewith electrically.
  • a required electronic component an IC chip, a capacitor, a chip resistor and the like
  • Such an electronic component and other wiring may be provided on any of the surfaces of the laminar magnetic element as required.
  • these electronic component(s) and other wiring(s) are present on the surface of the laminar magnetic element on which surface the antenna wiring is present.
  • At least some of the electronic component(s) and other wiring(s) may be present on the opposite surface of the laminar magnetic element, in which case a through hole(s) may be provided through the laminar magnetic element with an electrically conductive element(s) (such as an electrically conductive resin, a resin solder, or the like) embedded therein or with an electrically conductive plated metal layer formed on the inside of the through hole(s) so as to ensure the electrical connection between the antenna wirings on the both surfaces of the laminar magnetic element and the electronic component(s) and other wiring(s).
  • an electrically conductive element(s) such as an electrically conductive resin, a resin solder, or the like
  • the structure described above wherein the antenna wiring is protruded from the surface of the laminar magnetic element is intrinsically obtained by manufacturing in accordance with the antenna device manufacturing method of the present invention as described above and below.
  • the metal foil, as the precursor of the antenna wiring, on the laminar magnetic element and then etching the metal foil so that only portions corresponding to the antenna wiring remain, such a structure is obtained as a result.
  • the manufacturing method of the antenna device comprises the step of bonding (for example, thermally pressing) a metal foil directly on the laminar magnetic element so as to produce an antenna element precursor (the step (2) in Fig. 2 ) and the step of etching the metal foil to form the antenna wiring having a prescribed pattern (the step (3) in Fig. 2 ).
  • the laminar magnetic element may be obtained by forming the above magnetic composition into a layer form.
  • the laminar magnetic element may be obtained in sheet form by press molding or compression molding.
  • the laminar element having a prescribed thickness may be obtained by filling a cavity corresponding to the prescribed thickness of the laminar element with the magnetic composition and pressing/heating this.
  • the laminar magnetic element may be obtained by extruding the magnetic component under heat. In this case, an elongated (or continuous) laminar magnetic element is obtained.
  • the heated laminar magnetic element may be cooled as required.
  • the method of manufacturing the antenna device of the present invention comprises:
  • Figure 2 shows a flow sheet of the manufacturing method of the present invention as described above.
  • the step to obtain the magnetic composition is also shown.
  • the magnetic material and the polymer material are mixed using appropriate mixing/kneading means (such as Banbury Mixer, a twin screw kneader, or the like) to obtain a composition wherein these are homogeneously mixed.
  • the composition is formed (for example extruded) into the laminar magnetic element
  • the bonding of the metal foil to the laminar magnetic element is preferably performed by placing the metal foil on the laminar magnetic element and thermally pressing using, for example, a thermal press.
  • the laminar magnetic element is heated.
  • At least the surface on which the metal foil is placed is heated to at least the softening temperature of the polymer material, and preferably to the melting temperature thereof.
  • the heating of the laminar magnetic element it may be heated alone or together with the metal foil placed thereon.
  • the metal foil may also be heated, when required.
  • the metal foil is thermally compressed immediately after obtaining the laminar magnetic element by extrusion, while the laminar magnetic element is still at a relatively high temperature.
  • the metal foil is preferably thermally pressed immediately after the extrusion.
  • the extrusion and the thermal pressing are performed as a continuous process.
  • the laminar magnetic element, in particular the surface thereof may be heated as required. Heating rollers for example may be used for this purpose.
  • the metal foil to be used preferably has, on the surface that is to be in contact with the laminar magnetic element, nodular or bumpy protrusions, which ensure adequate bond strength with the laminar magnetic element.
  • a metal foil of which surface has irregularities formed by electrodepositing metal bumps and which is commercially available as an electrolytic metal foil (for example, an electrolytic copper foil) is preferred.
  • the metal foil is preferably placed so that the uneven surface is in contact with the laminar magnetic element.
  • the metal foil when bonding the metal foil and forming the antenna wiring pattern by etching, the metal foil has a sufficient area to be able to form a plurality of the antenna wirings.
  • a plurality of the antenna wirings are formed by etching. In this case, this may be divided after etching into the laminar magnetic elements each having an individual antenna wiring to obtain separate antenna devices.
  • the antenna device of the present invention may have a required electronic component(s) (for example, an IC chip, a capacitors or the like) in addition to the antenna wiring, and may have other wiring(s) to connect in a prescribed manner such an electronic component(s) with the antenna wiring.
  • a required electronic component(s) for example, an IC chip, a capacitors or the like
  • Such wiring is also preferably formed, as required, simultaneously during etching to form the antenna wiring.
  • the electronic component(s) is preferably mounted after the antenna wiring and other required wiring are formed by etching.
  • mounting is preferably performed before dividing into the separate antenna devices.
  • the antenna wiring is present on one of the surfaces of the laminar magnetic element.
  • the antenna wirings are present on the both sides of the laminar magnetic element.
  • such antenna device can be manufactured by directly bonding the metal foils to the both sides of the laminar magnetic element, and then etching the metal foils.
  • the thermally pressing is preferably used.
  • the laminar magnetic element and the metal foil are both heated, and then they are cooled. Since thermal expansion coefficient (particularly, linear expansion coefficient) of them are different, the composite of the metal foil and the laminar magnetic element having been thermally pressed together includes an inner stress due to the thermal expansion coefficient difference even though the composite apparently looks flat. When a part of the metal foil is removed by etching the metal foil thereafter, such inner stress appears so that the composite shows warpage.
  • the antenna device when the metal foils are bonded to the both surfaces of the magnetic element as in the above mentioned embodiment, the inner stress is substantially still potential even with the difference in the thermal expansion coefficients because the metal foils are present on the both sides of the laminar magnetic element, so that improved flatness is achieved.
  • the antenna wirings are present on the both sides of the laminar magnetic element.
  • the antenna wirings are formed so as to oppose to each other through the laminar magnetic element. That is, it is preferable that one antenna wiring is overlapped with the other antenna wiring through the laminar magnetic element.
  • one antenna wiring is at least partly overlapped with the other antenna wiring, and one antenna wiring is preferably substantially just overlapped with the other antenna wiring.
  • a through hole is formed through the laminar magnetic element at an end of one antenna wiring, and the through hole is filled with an electrically conductive element or a plating layer is formed on the inside of the through hole so as to surely achieve the electric conductivity between the both antenna wirings.
  • the presence of the antenna wirings on the both sides of the laminar magnetic element allows the absolute length of the antenna wiring to be longer than the presence of the antenna wiring on one side of the laminar magnetic element when the both elements are of the same size. This means the size of the antenna device can be smaller. Since the absolute length of the antenna wiring becomes longer, it is able to give a more margin to the inductance/capacitance adjustment, and also a more freedom to the antenna wiring design, so that it becomes possible that the geometric limitations upon the formation of the antenna wiring becomes more relaxed compared with the formation of the single antenna wiring on one side of the laminar magnetic element.
  • Example 1 Magnetic material 88.0 % by mass 80.0 % by mass Polymer material 12.0 % by mass 20.0 % by mass
  • the kneaded lump obtained as described above was made into a sandwich construction of iron plate/Teflon sheet/thickness adjusting spacer (SUS, thickness 0.5mm) + kneaded lump/Teflon sheet/iron plate, and pre-pressed form 3 minutes using a thermal pressure pressing machine (manufactured by Toho Press Seisakusho, hydraulic molding machine: Model T-1) at a set temperature of 100 °C and a set pressure of 1 MPa, after which actual pressing was performed at 15 MPa for 4 minutes.
  • a thermal pressure pressing machine manufactured by Toho Press Seisakusho, hydraulic molding machine: Model T-1
  • cold pressing was performed at 1 MPa for 4 minutes using a cold pressing machine (manufactured by Toho Press Seisakusho, hydraulic molding machine: Model T-1) with circulation of water set at a temperature of 22 °C by a chiller, thereby obtaining a 12 cm x 12 cm magnetic sheet (thickness: 0.4-0.6 mm) as the laminar magnetic element.
  • a cold pressing machine manufactured by Toho Press Seisakusho, hydraulic molding machine: Model T-1
  • circulation of water set at a temperature of 22 °C by a chiller, thereby obtaining a 12 cm x 12 cm magnetic sheet (thickness: 0.4-0.6 mm) as the laminar magnetic element.
  • Example 1 Magnetic permeability (@14 MHz) 30.70 43.00 Saturation magnetic flux density (G) 2986 2674
  • test samples were measured in the same way as before in the above, for the magnetic permeability and the saturation magnetic flux density. Table 3 below shows the results of the measurements.
  • Example 1 Magnetic permeability (@14 MHz) 36.80 51.30 Saturation magnetic flux density (G) 3495 3265
  • the antenna device of the present invention having the spiral antenna pattern, shows sufficient inductance L and Q values, and thus performs the functions as an antenna device.
  • the present invention provides the antenna device which can be manufactured more conveniently as well as the method for manufacturing such device.

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  • Manufacturing & Machinery (AREA)
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EP07792377A 2006-08-14 2007-08-10 Antennenelement und verfahren zu seiner herstellung Withdrawn EP2063489A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006221037 2006-08-14
PCT/JP2007/065732 WO2008020574A1 (fr) 2006-08-14 2007-08-10 Élément d'antenne et procédé de fabrication de celui-ci

Publications (2)

Publication Number Publication Date
EP2063489A1 true EP2063489A1 (de) 2009-05-27
EP2063489A4 EP2063489A4 (de) 2009-08-12

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EP (1) EP2063489A4 (de)
JP (1) JPWO2008020574A1 (de)
KR (1) KR20090051096A (de)
CN (1) CN101501930A (de)
TW (1) TW200828679A (de)
WO (1) WO2008020574A1 (de)

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WO2011135153A1 (en) * 2010-04-29 2011-11-03 Upm Raflatac Oy Method for manufacturing an antenna component by etching
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US11354558B2 (en) 2013-01-18 2022-06-07 Amatech Group Limited Contactless smartcards with coupling frames
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JPWO2008020574A1 (ja) 2010-01-07
WO2008020574A1 (fr) 2008-02-21
EP2063489A4 (de) 2009-08-12
CN101501930A (zh) 2009-08-05
TW200828679A (en) 2008-07-01

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