CA2284600A1 - Apparatus for magnetically decoupling an rfid tag - Google Patents

Apparatus for magnetically decoupling an rfid tag Download PDF

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Publication number
CA2284600A1
CA2284600A1 CA002284600A CA2284600A CA2284600A1 CA 2284600 A1 CA2284600 A1 CA 2284600A1 CA 002284600 A CA002284600 A CA 002284600A CA 2284600 A CA2284600 A CA 2284600A CA 2284600 A1 CA2284600 A1 CA 2284600A1
Authority
CA
Canada
Prior art keywords
circuit
rfid tag
tag
resonant
magnetically decoupling
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
CA002284600A
Other languages
French (fr)
Other versions
CA2284600C (en
Inventor
Janez Trontelj
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.)
Checkpoint Systems Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2284600A1 publication Critical patent/CA2284600A1/en
Application granted granted Critical
Publication of CA2284600C publication Critical patent/CA2284600C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H04B5/263—
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • 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
    • G06K19/0723—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 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details
    • H04B5/77—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
    • G01S13/753—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal using frequency selective elements, e.g. resonator

Abstract

A resonant circuit tag (12) includes an integrated circuit (18) for storing data and an antenna circuit (22) for generating a first local field and resonating at a first predetermined radio frequency. A second circuit including an inductive coil (30) selectively generates a second local field such that a sum of the first and second local fields approaches zero. The second circuit thus allows the resonant tag (12) to be selectively decoupled from its environment.
CA002284600A 1997-03-24 1998-03-16 Apparatus for magnetically decoupling an rfid tag Expired - Fee Related CA2284600C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US4146697P 1997-03-24 1997-03-24
US60/041,466 1998-03-05
US09/035,027 US6208235B1 (en) 1997-03-24 1998-03-05 Apparatus for magnetically decoupling an RFID tag
US09/035,027 1998-03-05
PCT/US1998/005130 WO1998043218A1 (en) 1997-03-24 1998-03-16 Apparatus for magnetically decoupling an rfid tag

Publications (2)

Publication Number Publication Date
CA2284600A1 true CA2284600A1 (en) 1998-10-01
CA2284600C CA2284600C (en) 2008-07-29

Family

ID=26711685

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002284600A Expired - Fee Related CA2284600C (en) 1997-03-24 1998-03-16 Apparatus for magnetically decoupling an rfid tag

Country Status (13)

Country Link
US (1) US6208235B1 (en)
EP (1) EP0968488B1 (en)
JP (1) JP4095677B2 (en)
KR (1) KR100525584B1 (en)
CN (1) CN1227627C (en)
AR (1) AR012144A1 (en)
AT (1) ATE255757T1 (en)
AU (1) AU723295B2 (en)
CA (1) CA2284600C (en)
DE (1) DE69820236T2 (en)
DK (1) DK0968488T3 (en)
ES (1) ES2212271T3 (en)
WO (1) WO1998043218A1 (en)

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ATE255757T1 (en) 2003-12-15
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AU723295B2 (en) 2000-08-24
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CA2284600C (en) 2008-07-29
AR012144A1 (en) 2000-09-27
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KR100525584B1 (en) 2005-11-03
WO1998043218A1 (en) 1998-10-01
AU6703698A (en) 1998-10-20
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DE69820236D1 (en) 2004-01-15
CN1251189A (en) 2000-04-19
DK0968488T3 (en) 2004-03-29
US6208235B1 (en) 2001-03-27
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JP2002515155A (en) 2002-05-21
EP0968488B1 (en) 2003-12-03

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