EP2756547A1 - Rfid-antenne - Google Patents

Rfid-antenne

Info

Publication number
EP2756547A1
EP2756547A1 EP12766295.5A EP12766295A EP2756547A1 EP 2756547 A1 EP2756547 A1 EP 2756547A1 EP 12766295 A EP12766295 A EP 12766295A EP 2756547 A1 EP2756547 A1 EP 2756547A1
Authority
EP
European Patent Office
Prior art keywords
antenna
conductive layer
magnetic sheet
track
electrically conductive
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.)
Granted
Application number
EP12766295.5A
Other languages
English (en)
French (fr)
Other versions
EP2756547B1 (de
Inventor
Christophe Mathieu
Yean Wei Yeap
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.)
Linxens Holding SAS
Original Assignee
Linxens Holding SAS
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 Linxens Holding SAS filed Critical Linxens Holding SAS
Publication of EP2756547A1 publication Critical patent/EP2756547A1/de
Application granted granted Critical
Publication of EP2756547B1 publication Critical patent/EP2756547B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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

Definitions

  • the invention relates to a method for manufacturing an antenna and to an antenna obtainable by the method.
  • a tag having an RFID antenna to identify and monitor objects is well known in the art.
  • a tag comprises for instance an antenna circuit formed with conductive tracks which is electrically connected to an integrated circuit (IC) chip that includes a memory. It uses electromagnetic field produced by an RFID reader. If such a tag enters the magnetic field for a sufficient time, the RFID antenna will become energized and the electronic circuit can transmit a signal towards the reader or a separate receiving antenna.
  • IC integrated circuit
  • Such a mode for contactless communication between an IC tag and a reader/writer is expected to become more diversified in the future.
  • portable communication terminals such as mobile phones will be equipped with a tag function and a reader/writer function.
  • the mobile phone can be used to pay train fares by holding the phone up against the station gate.
  • the antenna also has to meet space consumption requirement, in particular the antenna should have a thickness as thin as possible and should be as easy as possible to manufacture and is compatible with mass production specification. Thickness issue is particularly important when the antenna is intended to be cased in a mobile phone, especially new generation of slim smart phones, where space is quite limited .
  • An object of the present invention is to provide a method for manufacturing an antenna of reduced thickness and cost and which is operative when it is mounted on a metallic device and/or placed in an environment surrounded by electromagnetic fields.
  • Fig.l shows a first embodiment of an antenna according to the invention
  • Fig.2 shows a second embodiment of an antenna according to the invention
  • Fig.3 shows a cross-sectional view of the antenna of along the arrow of Fig. 2.
  • Fig.l show a first embodiment of a planar RFID antenna which comprises a supporting substrate 2 on which an electrically conductive track 4 has been formed.
  • the substrate 2 is, in the context of the invention, made of a magnetic flexible sheet which comprises magnetic particles (such as a powder or a flake of magnetic ferrite) dispersed in a resin binder.
  • An example of such a ferrite sheet is Liqualloy (TM) Flexible Film sold by Alps Electric Co., LTD.
  • TM Liqualloy
  • Such type of ferrite sheets are also easily available by ferrite material suppliers, such as for example Japanese ferrite material suppliers.
  • the conductive track has been directly formed on a first main surface of the ferrite sheet, such that the conductive track extends in a plane parallel to the first main surface.
  • the conductive track is for instance made of copper.
  • the antenna track comprises a plurality of turns (here there are four turns) in the form of a spiral.
  • the outer turns comprises a connection end which is connected to a connection end of the inner turn via an electrical bridge.
  • the method will be advantageously chosen such that it can be carried out via a reel-to-reel process, which allows high production rate.
  • Methods particularly adapted for reel-to-reel implementation are the first three above-mentioned methods.
  • the antenna track can be designed such that its resonance frequency lies in the range of 13.56 MHz in order to meet, for instance NFC specification.
  • Fig. 2 represents a second embodiment of the antenna and differs from the first one in that the two connection ends of the antenna conductive track are not bridged.
  • Fig. 3 which is a cross-sectional view in a line A-A of Fig. 2, one may observe that the copper ferrite laminate is provided with two blind holes, located at the level of the two antenna connection ends. These blind holes provide an easy access for electrically connecting the antenna to a device.
  • the antenna connection ends may be mechanically embossed for getting a reliable electrical connection with the device.
  • the process comprises:
  • step g) one may proceed with an additional plating step on the exposed copper track and on the bottom surface of the blind holes, for instance with a nickel and gold coating; alternatively one may carry out passivation step of the antenna tracks for corrosion protection .
  • steps b) and d) to g) can be replaced by printing techniques, as described e.g. in US 7,060,418 which is incorporated by reference.
  • the applicant has then succeeded in obtaining antennas of thickness ranging between 150 to 200ym with a layered structure as schematically drawn in Fig. 4.
  • the layered structure so called single-sided with blind holes comprises the ferrite sheet, an adhesive layer on top of the first surface of the ferrite sheet and eventually a laminated copper layer.
  • the ferrite sheet, the adhesive layer and the conductive track thicknesses are about lOOym, 20ym and 35ym, respectively.
  • a second sheet of magnetic material is placed on a second surface of the above described composite magnetic sheet, i.e. on an opposite surface of the first magnetic sheet to the surface onto which the conductive track is formed or to be formed.
  • two types of ferrite materials are used for the first and second sheet.
  • the first sheet is preferably chosen with a value of the imaginary part ⁇ ' ' of the permeability which is lower than 5 H/m. "lower” will be understood as “lower or equal”. Due to low value of ⁇ ' ' of such a composite ferrite material which is typically polymer based, this first magnetic sheet will typically have a value of the real part ] ' of the permeability which is low i.e. a value which is between 40 and 50 H/m.
  • ⁇ ' ' allows to minimize ohmic loss of the eventually realised antenna.
  • the second sheet of ferrite material is chosen with a high value of ⁇ ' , i.e. a value higher than 100 H/m. "Higher” will be understood as “higher or equal”. The choice of the value of ⁇ ' ' is not important.
  • a second sheet of ferrite material with such a high value of ⁇ ' allows to obtain an antenna with an enhanced quality factor Q.
  • Such a second magnetic sheet can be made of a composite material including magnetic particles and a synthetic resin, a sintered type of magnetic material or can be a plain ferrite sheet.
  • the obtained antenna has excellent behaviour in particular as to reduced ohmic loss and quality factor Q.
  • Such first and second magnetic sheets are in particular easily available by ferrite material suppliers, such as for example Japanese ferrite material suppliers.
  • the layered structure usually comprises:
  • a dielectric substrate e.g. epoxy glass or PET or polyimide
  • Main limitations of the known antenna structure are the high total thickness and the high distance between antenna conductive tracks and the ferrite sheet.

Landscapes

  • Details Of Aerials (AREA)
EP12766295.5A 2011-09-14 2012-09-11 Rfid-antenne Active EP2756547B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2011004370A MY166125A (en) 2011-09-14 2011-09-14 Rfid antenna
PCT/EP2012/067718 WO2013037762A1 (en) 2011-09-14 2012-09-11 Rfid antenna

Publications (2)

Publication Number Publication Date
EP2756547A1 true EP2756547A1 (de) 2014-07-23
EP2756547B1 EP2756547B1 (de) 2023-02-22

Family

ID=46939696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12766295.5A Active EP2756547B1 (de) 2011-09-14 2012-09-11 Rfid-antenne

Country Status (6)

Country Link
EP (1) EP2756547B1 (de)
JP (2) JP6095070B2 (de)
KR (1) KR20140060358A (de)
CN (2) CN108695595A (de)
MY (1) MY166125A (de)
WO (1) WO2013037762A1 (de)

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CN103746181B (zh) * 2013-12-31 2017-06-13 瑞声科技(沭阳)有限公司 Nfc天线及其制作方法
CN105098365B (zh) * 2014-05-14 2018-08-10 3M创新有限公司 近场通信模块
CN105633583A (zh) * 2014-10-28 2016-06-01 林小群 一种近场通信模块及其制作方法
DE102015009319A1 (de) * 2015-07-17 2017-01-19 Saurer Germany Gmbh & Co. Kg Transportsystem für Spinnkopse und Verfahren zum Betreiben des Transportsystems
CN106650889A (zh) * 2016-11-22 2017-05-10 武汉大学 一种集成磁复合膜的近场通信标签及其制备方法
JP7344003B2 (ja) * 2018-04-24 2023-09-13 京セラ株式会社 Ｒｆｉｄタグおよびｒｆｉｄシステム
JP7190694B2 (ja) 2018-12-06 2022-12-16 株式会社マルアイ Ｒｆｉｄの導電性パターンの製造方法

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EP2001078A1 (de) * 2007-05-25 2008-12-10 Laird Technologies AB Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung damit
EP2302567A1 (de) * 2009-09-17 2011-03-30 Nxp B.V. Oberflächentolerante RFID-Transpondervorrichtung

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EP2001078A1 (de) * 2007-05-25 2008-12-10 Laird Technologies AB Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung damit
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Also Published As

Publication number Publication date
JP2014527375A (ja) 2014-10-09
MY166125A (en) 2018-05-24
CN108695595A (zh) 2018-10-23
WO2013037762A1 (en) 2013-03-21
CN103947040A (zh) 2014-07-23
JP6126188B2 (ja) 2017-05-10
EP2756547B1 (de) 2023-02-22
JP2016034151A (ja) 2016-03-10
KR20140060358A (ko) 2014-05-19
JP6095070B2 (ja) 2017-03-15

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