EP2095338A1 - Antenne d'un lecteur rfid pour la communication de données inductive - Google Patents

Antenne d'un lecteur rfid pour la communication de données inductive

Info

Publication number
EP2095338A1
EP2095338A1 EP07801358A EP07801358A EP2095338A1 EP 2095338 A1 EP2095338 A1 EP 2095338A1 EP 07801358 A EP07801358 A EP 07801358A EP 07801358 A EP07801358 A EP 07801358A EP 2095338 A1 EP2095338 A1 EP 2095338A1
Authority
EP
European Patent Office
Prior art keywords
coil
antenna
mounting plate
metallic
data communication
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Withdrawn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
EP07801358A
Other languages
German (de)
English (en)
Inventor
Thomas ZÖLLE
Ulrich Möller
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.)
Conti Temic Microelectronic GmbH
Original Assignee
Conti Temic Microelectronic GmbH
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 Conti Temic Microelectronic GmbH filed Critical Conti Temic Microelectronic GmbH
Publication of EP2095338A1 publication Critical patent/EP2095338A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00944—Details of construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • H01Q21/293—Combinations of different interacting antenna units for giving a desired directional characteristic one unit or more being an array of identical aerial elements
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2325/00—Indexing scheme relating to vehicle anti-theft devices
    • B60R2325/10—Communication protocols, communication systems of vehicle anti-theft devices
    • B60R2325/105—Radio frequency identification data [RFID]
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G07C2009/00507—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks keyless data carrier having more than one function
    • G07C2009/00547—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks keyless data carrier having more than one function starting ignition

Definitions

  • the invention relates to an antenna (read coil) of an RFID reader having at least one coil according to the preambles of the independent claims.
  • Inductively coupled RFID systems are used to identify vehicle keys, the identification of vehicle keys being based on the principle of electromagnetic induction and occurring in a near field of a range of a few centimeters.
  • Such a system has an antenna, which is also called the read coil of the RFID reader.
  • the antenna has an inductive coil with several turns.
  • the antenna is usually installed in the immediate vicinity of the ignition lock or start / stop button.
  • the vehicle key is inserted into the key receptacle of the ignition or brought into the vicinity of the start / stop button.
  • the RFID reader is turned on and current flows through the inductive coil of the antenna and generates electromagnetic field.
  • the electromagnetic field of the antenna coil when bringing the vehicle key to the antenna, the electromagnetic field of the antenna coil generates an induction current in the coil in the vehicle key and thus activates the signal transmitter in the key.
  • the signal transmitter then transmits identification code to the antenna of the reader.
  • the reader compares the received code with previously stored identification data and, in the event of a match, sends a signal to the control system in the vehicle to unlock the locking system and / or start the vehicle.
  • the identification of the vehicle key therefore takes place by means of electromagnetic interaction between the antenna coil of the RFID reader and the coil in the vehicle key.
  • the vehicle key Since the vehicle key receives the energy required for data communication or identification from the reader via the electromagnetic field, data communication or identification and thus unlocking and / or starting from the vehicle itself in emergencies is possible when the batteries in the vehicle key are empty or the vehicle key does not have its own power supply.
  • the antenna of the RFID reader together with the coil is sealed to a support plate such as dashboard or a wall of the steering column housing arranged, wherein such carrier plate is increasingly made of metal such as magnesium or aluminum.
  • the arrangement of the antenna coil on a metallic support plate causes the electromagnetic field from the coil in the metal surface of the support plate induces eddy currents, the eddy currents in turn generate electromagnetic (interference) fields, which counteract the original field of the antenna coil and thus attenuate this or completely compensate. This reduces the range of the antenna and thus an identification of vehicle keys by means of RFID system is not possible or very difficult to perform.
  • the core idea of the invention is, to the first coil (1) of the antenna, hereinafter called this primary coil, a second coil (3), hereinafter called this secondary coil, to be arranged in the antenna.
  • the secondary coil (3) is arranged on the primary coil (1) opposite side of the metal surface (2) of the support plate, wherein the secondary coil (3) is energized in opposite directions to the primary coil (1).
  • the two coils (1 and 3) are arranged on the support plate and the dimensions of both coils (1 and 3) are designed so that the electromagnetic fields (4.1 and 4.2) of the two coils (1 and 3) on the metal surface (2 ) counteract the support plate and preferably compensate.
  • Such a concept corresponds to the principle of a Maxwell coil.
  • the metal surface (2) theoretically no or at least lower eddy currents, which in turn induce electromagnetic interference fields, which weaken the electromagnetic field (4.1) of the primary coil (1).
  • the electromagnetic field (4.1) of the primary coil (1) is only slightly disturbed by the field (4.2) of the secondary coil (3) in the area (6) where the vehicle key is brought to the identification.
  • a coil pair arranged in this way is referred to in the specialist literature as Maxwell coils or anti-Helmholtz coils.
  • the inventive arrangement of the second coil (3) is mainly allows the data communication or the identification of vehicle keys in a greater range of the first coil (1) and is carried out at lower electromagnetic interference fields.
  • the antenna devices according to the invention can also be used in other areas where inductive data communication is to be performed by means of RFID systems and the antenna coil is arranged on a metallic carrier plate or on a carrier plate with metallic components.
  • one or more secondary coils can be arranged on the carrier plate and the dimensions of the secondary coils can be configured and energized in such a way that the mutual compensation of the electromagnetic fields of primary and secondary coils in the metallic components form no or at least small eddy currents, which in turn induce electromagnetic interference fields which attenuate the electromagnetic field of the primary coil.
  • a second coil namely secondary coil (3) with the same radius R on the same axis (10) parallel to the primary coil (1 ) arranged.
  • the axial distance of the two coils (1 and 3) is -J ⁇ -R.
  • the metal surface (2) of the carrier plate lies axially exactly in the middle of the two coils (1 and 3) and parallel to both coils (1 and 3). So is
  • the two coils (1 and 3) are energized with the same flow strength / in opposite directions.
  • electromagnetic fields (4.1 and 4.2) of both coils (1 and 3) which together form an electromagnetic field constellation, which is called quadrupole field in the technical literature.
  • the metal surface (2) of the support plate In the central area (5) of both coil (1 and 3), where the metal surface (2) of the support plate is located, compensate both fields (4.1 and 4.2). This theoretically creates no or negligible eddy currents in the metal surface (2), thus no or negligible electromagnetic interference fields, which attenuate the electromagnetic field (4.1) of the primary coil (1) in the area (6), where vehicle keys for data communication or identification to be brought.
  • the dimensions of the coils in particular the coincidence of the axes, radii and currents as well as the parallelism of the coils to each other and the support plate is to be regarded as optimal for the effect, but not mandatory for the basic mode of action. In technically reasonable limits, deviations are possible without the intended mode of action being lost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Lock And Its Accessories (AREA)

Abstract

L'invention concerne une antenne (bobine de lecture) d'un lecteur RFID pour la communication de données inductive, en particulier pour l'identification d'une clé de véhicule. L'antenne d'un lecteur RFID est disposée sur une plaque de support métallique et présente une bobine électromagnétique. Afin d'éviter les perturbations électromagnétiques en raison des courants parasites dans la plaque de support métallique et garantir de la sorte une portée de la communication des données la plus étendue possible, on dispose une seconde bobine sur le côté opposé à la première bobine de la surface métallique de la plaque de support, la deuxième bobine étant traversée par le courant en sens contraire à celui de la première bobine. Les deux bobines sont par ailleurs dimensionnées et disposées sur les deux côtés de la plaque de support et traversées par le courant de manière à ce que les champs électromagnétiques des deux bobines dans la surface métallique de la plaque de support se compensent. De cette manière, on évite avant tout la formation de courants parasites dans la surface métallique de la plaque de support, lesquels induisent à leur tour des perturbations électromagnétiques, les perturbations affaiblissant le champ propre à la première bobine. Les antennes selon l'invention d'un lecteur RFID peuvent être utilisées pour l'interrupteur d'allumage ou un bouton-poussoir dans un véhicule. Elles peuvent en outre également être utilisées dans d'autres domaines nécessitant une communication de données inductive à l'aide de systèmes RFID et où la bobine est disposée sur une plaque de support métallique ou une plaque de support dotée de composants métalliques.
EP07801358A 2006-11-24 2007-09-20 Antenne d'un lecteur rfid pour la communication de données inductive Withdrawn EP2095338A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610055505 DE102006055505A1 (de) 2006-11-24 2006-11-24 Antenne eines RFID-Lesegeräts für induktive Datenkommunikation
PCT/DE2007/001697 WO2008061485A1 (fr) 2006-11-24 2007-09-20 Antenne d'un lecteur rfid pour la communication de données inductive

Publications (1)

Publication Number Publication Date
EP2095338A1 true EP2095338A1 (fr) 2009-09-02

Family

ID=38961306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07801358A Withdrawn EP2095338A1 (fr) 2006-11-24 2007-09-20 Antenne d'un lecteur rfid pour la communication de données inductive

Country Status (3)

Country Link
EP (1) EP2095338A1 (fr)
DE (2) DE102006055505A1 (fr)
WO (1) WO2008061485A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3024594B1 (fr) * 2014-07-31 2017-12-01 Continental Automotive France Dispositif de communication radiofrequence en champ proche avec un element portable embarque dans un vehicule automobile
CN111105533A (zh) * 2019-12-20 2020-05-05 珠海格力电器股份有限公司 一种智能门锁的开锁控制方法及装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2565632Y2 (ja) * 1993-06-08 1998-03-18 株式会社東海理化電機製作所 キーシリンダ装置
DE10105191B4 (de) * 2001-02-06 2005-05-19 Robert Bosch Gmbh Antennenanordnung für ein Kraftfahrzeug zur Berechtigungsermittlung eines tragbaren Transponders
JP4217520B2 (ja) * 2003-04-16 2009-02-04 株式会社東海理化電機製作所 スイッチ装置
JP2006178713A (ja) * 2004-12-22 2006-07-06 Fuji Electric Holdings Co Ltd 情報処理装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008061485A1 *

Also Published As

Publication number Publication date
DE102006055505A1 (de) 2008-05-29
DE112007000057A5 (de) 2008-10-09
WO2008061485A1 (fr) 2008-05-29

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