EP0469769A3 - Magnetically-coupled, two-resonant-circuit, frequency-division tag - Google Patents

Magnetically-coupled, two-resonant-circuit, frequency-division tag Download PDF

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Publication number
EP0469769A3
EP0469769A3 EP19910306658 EP91306658A EP0469769A3 EP 0469769 A3 EP0469769 A3 EP 0469769A3 EP 19910306658 EP19910306658 EP 19910306658 EP 91306658 A EP91306658 A EP 91306658A EP 0469769 A3 EP0469769 A3 EP 0469769A3
Authority
EP
European Patent Office
Prior art keywords
circuit
frequency
resonant
electromagnetic radiation
response
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
EP19910306658
Other versions
EP0469769A2 (en
EP0469769B1 (en
Inventor
Fred Wade Herman
Ming Ren Lian
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.)
Sensormatic Electronics Corp
Original Assignee
Security Tag Systems Inc
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
Priority claimed from US07/562,471 external-priority patent/US5065138A/en
Priority claimed from US07/562,475 external-priority patent/US5065137A/en
Application filed by Security Tag Systems Inc filed Critical Security Tag Systems Inc
Publication of EP0469769A2 publication Critical patent/EP0469769A2/en
Publication of EP0469769A3 publication Critical patent/EP0469769A3/en
Application granted granted Critical
Publication of EP0469769B1 publication Critical patent/EP0469769B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • G08B13/242—Tag deactivation
    • 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
    • G08B13/2422—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 acoustic or microwave 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
    • G08B13/2422—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 acoustic or microwave tags
    • G08B13/2425—Tag deactivation
    • 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
    • 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
    • G08B13/2437—Tag layered structure, processes for making layered 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details

Abstract

A batteryless, portable, frequency divider includes a first resonant LC circuit (70) that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; and a second resonant LC circuit (74) that is resonant at a second frequency that is one-half the first frequency for transmitting electromagnetic radiation at the second frequency. The first circuit is coupled only magnetically to the second circuit to transfer energy to the second circuit in response to receipt by the first circuit of electromagnetic radiation at the first frequency. At least one of the resonant circuits includes a variable reactance element, such as a variable capacitance diode (D1<.>, D1<..>) or a varactor. In a variable reactance element (D1<.>) of the first circuit (70), the reactance varies with variations in energy received by the first circuit for causing the second circuit to vary in reactance due to mutual reactive coupling to cause the second circuit to transmit electromagnetic radiation at the second frequency in response to the energy transferred from the first circuit at the first frequency. In a variable reactance element (D2<.>) of the second circuit (74), the reactance varies with variations in energy transferred from the first circuit for causing the second circuit to transmit electromagnetic radiation at the second frequency in response to the energy transferred from the first circuit at the first frequency. Both resonant circuits include inductance coils (L1<.>, L2<.>) that are disposed on a ferrite rod (72), for enhancing the magnetic coupling. The frequency divider is included in a tag utilized in a presence detection system. <IMAGE>
EP91306658A 1990-08-03 1991-07-22 Magnetically-coupled, two-resonant-circuit, frequency-division tag Expired - Lifetime EP0469769B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/562,471 US5065138A (en) 1990-08-03 1990-08-03 Magnetically-coupled two-resonant-circuit, frequency divider for presence-detection-system tag
US07/562,475 US5065137A (en) 1990-08-03 1990-08-03 Magnetically-coupled, two-resonant-circuit, frequency-division tag
US562475 1990-08-03
US562471 1990-08-03

Publications (3)

Publication Number Publication Date
EP0469769A2 EP0469769A2 (en) 1992-02-05
EP0469769A3 true EP0469769A3 (en) 1992-12-30
EP0469769B1 EP0469769B1 (en) 1997-05-07

Family

ID=27072966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91306658A Expired - Lifetime EP0469769B1 (en) 1990-08-03 1991-07-22 Magnetically-coupled, two-resonant-circuit, frequency-division tag

Country Status (8)

Country Link
EP (1) EP0469769B1 (en)
JP (1) JP3224564B2 (en)
AT (1) ATE152848T1 (en)
AU (1) AU635654B2 (en)
CA (1) CA2047559C (en)
DE (1) DE69125985T2 (en)
ES (1) ES2100934T3 (en)
NO (1) NO912997L (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241298A (en) * 1992-03-18 1993-08-31 Security Tag Systems, Inc. Electrically-and-magnetically-coupled, batteryless, portable, frequency divider
SE508322C2 (en) * 1994-02-07 1998-09-28 Leif Aasbrink Alarm element
GB9815118D0 (en) * 1998-07-14 1998-09-09 Clan Holdings Ltd Security tag
US7199717B2 (en) * 2004-02-17 2007-04-03 Sensormatic Electronics Corporation Frequency-division marker for an electronic article surveillance system
US10380857B1 (en) * 2018-03-05 2019-08-13 Sensormatic Electronics, LLC Systems and methods for radio frequency identification enabled deactivation of acousto-magnetic ferrite based marker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303910A (en) * 1977-04-28 1981-12-01 Parmeko Limited Detection system
US4572976A (en) * 1982-12-10 1986-02-25 N.V. Nederlandsche Apparatenfabriek Nedap Transponder for electromagnetic detection system with non-linear circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481428A (en) * 1981-05-19 1984-11-06 Security Tag Systems, Inc. Batteryless, portable, frequency divider useful as a transponder of electromagnetic radiation
US4727360A (en) * 1985-09-13 1988-02-23 Security Tag Systems, Inc. Frequency-dividing transponder and use thereof in a presence detection system
US4670740A (en) * 1985-11-04 1987-06-02 Security Tag Systems, Inc. Portable, batteryless, frequency divider consisting of inductor and diode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303910A (en) * 1977-04-28 1981-12-01 Parmeko Limited Detection system
US4572976A (en) * 1982-12-10 1986-02-25 N.V. Nederlandsche Apparatenfabriek Nedap Transponder for electromagnetic detection system with non-linear circuit

Also Published As

Publication number Publication date
CA2047559C (en) 1999-07-06
EP0469769A2 (en) 1992-02-05
NO912997L (en) 1992-02-04
ES2100934T3 (en) 1997-07-01
DE69125985T2 (en) 1997-12-11
JPH04233696A (en) 1992-08-21
DE69125985D1 (en) 1997-06-12
ATE152848T1 (en) 1997-05-15
JP3224564B2 (en) 2001-10-29
AU635654B2 (en) 1993-03-25
NO912997D0 (en) 1991-08-01
EP0469769B1 (en) 1997-05-07
CA2047559A1 (en) 1992-02-04
AU8132591A (en) 1992-02-06

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