CA2091728A1 - Electrically-and-magnetically-coupled, batteryless, portable, frequency divider - Google Patents

Electrically-and-magnetically-coupled, batteryless, portable, frequency divider

Info

Publication number
CA2091728A1
CA2091728A1 CA002091728A CA2091728A CA2091728A1 CA 2091728 A1 CA2091728 A1 CA 2091728A1 CA 002091728 A CA002091728 A CA 002091728A CA 2091728 A CA2091728 A CA 2091728A CA 2091728 A1 CA2091728 A1 CA 2091728A1
Authority
CA
Canada
Prior art keywords
resonant circuit
frequency
resonant
circuit
electromagnetic radiation
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
CA002091728A
Other languages
French (fr)
Other versions
CA2091728C (en
Inventor
Ming Ren Lian
Fred Wade Herman
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.)
Security Tag Systems Inc
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
Application filed by Security Tag Systems Inc filed Critical Security Tag Systems Inc
Publication of CA2091728A1 publication Critical patent/CA2091728A1/en
Application granted granted Critical
Publication of CA2091728C publication Critical patent/CA2091728C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details

Abstract

A batteryless, portable, frequency divider includes a first resonant circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency: and a second resonant circuit that is resonant at a second frequency that is one-half the first frequency for transmitting electromagnetic radiation at the second frequency; and a circuit element electrically connecting the first resonant circuit to the second resonant circuit. The first resonant circuit is coupled magnetically to the second resonant circuit to transfer energy to the second resonant circuit at the first frequency in response to receipt by the first resonant circuit of electromagnetic radiation at the first frequency: and at least one of the first resonant circuit, the second resonant circuit and the circuit element includes an active element, such as a variable reactance element or a semiconductor switching device having gain, for causing the second resonant circuit to transmit electromagnetic radiation at the second frequency in response to the energy transferred from the first resonant circuit at the first frequency.
CA002091728A 1992-03-18 1993-03-16 Electrically-and-magnetically-coupled, batteryless, portable, frequency divider Expired - Fee Related CA2091728C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/853,533 1992-03-18
US07/853,533 US5241298A (en) 1992-03-18 1992-03-18 Electrically-and-magnetically-coupled, batteryless, portable, frequency divider

Publications (2)

Publication Number Publication Date
CA2091728A1 true CA2091728A1 (en) 1993-09-19
CA2091728C CA2091728C (en) 2001-04-03

Family

ID=25316289

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002091728A Expired - Fee Related CA2091728C (en) 1992-03-18 1993-03-16 Electrically-and-magnetically-coupled, batteryless, portable, frequency divider

Country Status (8)

Country Link
US (1) US5241298A (en)
EP (1) EP0561559B1 (en)
JP (1) JP3293936B2 (en)
AT (1) ATE139638T1 (en)
AU (2) AU656259B2 (en)
CA (1) CA2091728C (en)
DE (1) DE69303204T2 (en)
NO (1) NO930935L (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231265A (en) * 1990-09-28 1993-07-27 Balance Dynamics Corporation Method and apparatus for the transfer of electrical power to a balancer
EP0561560A1 (en) * 1992-03-18 1993-09-22 Security Tag Systems, Inc. Frequency divider with variable capacitance
US5317330A (en) * 1992-10-07 1994-05-31 Westinghouse Electric Corp. Dual resonant antenna circuit for RF tags
US5604485A (en) * 1993-04-21 1997-02-18 Motorola Inc. RF identification tag configurations and assemblies
EP0650216B1 (en) * 1993-10-26 2000-01-19 Texas Instruments Deutschland Gmbh Antenna circuit
SE508322C2 (en) * 1994-02-07 1998-09-28 Leif Aasbrink Alarm element
US5446447A (en) * 1994-02-16 1995-08-29 Motorola, Inc. RF tagging system including RF tags with variable frequency resonant circuits
US5661470A (en) * 1994-03-04 1997-08-26 Karr; Gerald S. Object recognition system
IT1271382B (en) * 1994-05-31 1997-05-27 Alessandro Manneschi METAL DETECTOR FOR COMBINED ACCESS CONTROL IN INTEGRATED FORM WITH TRANSPONDER DETECTOR
JP3468436B2 (en) * 1994-09-22 2003-11-17 豊田紡織株式会社 Resin air cleaner
US5517179A (en) * 1995-05-18 1996-05-14 Xlink Enterprises, Inc. Signal-powered frequency-dividing transponder
US6208235B1 (en) 1997-03-24 2001-03-27 Checkpoint Systems, Inc. Apparatus for magnetically decoupling an RFID tag
ITTO980146A1 (en) * 1998-02-25 1999-08-25 Alessandro Manneschi DETECTOR SYSTEM FOR ACCESS CONTROL AND RELATIVE DETECTOR GROUP.
GB9815120D0 (en) * 1998-07-14 1998-09-09 Clan Holdings Ltd Battery-less transponder circuit
US6072383A (en) * 1998-11-04 2000-06-06 Checkpoint Systems, Inc. RFID tag having parallel resonant circuit for magnetically decoupling tag from its environment
US7155973B2 (en) * 2003-07-08 2007-01-02 Stephen William Dyer Method and apparatus for balancing
US6400271B1 (en) * 2000-03-20 2002-06-04 Checkpoint Systems, Inc. Activate/deactiveable security tag with enhanced electronic protection for use with an electronic security system
BR0110648A (en) * 2000-05-08 2003-04-01 Checkpoint Systems Inc Radio Frequency Detection and Identification System
GB0921872D0 (en) * 2009-12-15 2010-01-27 Isis Innovation Asset detection apparatus and method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906245A (en) * 1973-01-22 1975-09-16 Michael T Shen Graded junction varactor frequency divider circuits employing large division factors
US4314373A (en) * 1976-05-24 1982-02-02 Harris Corporation Passive transmitter including parametric device
GB1599120A (en) * 1978-05-19 1981-09-30 Philips Electronic Associated Detection system
US4481428A (en) * 1981-05-19 1984-11-06 Security Tag Systems, Inc. Batteryless, portable, frequency divider useful as a transponder of electromagnetic radiation
NL8200138A (en) * 1982-01-14 1983-08-01 Nedap Nv DETECTION SYSTEM.
US4670740A (en) * 1985-11-04 1987-06-02 Security Tag Systems, Inc. Portable, batteryless, frequency divider consisting of inductor and diode
US5065138A (en) * 1990-08-03 1991-11-12 Security Tag Systems, Inc. Magnetically-coupled two-resonant-circuit, frequency divider for presence-detection-system tag
US5065137A (en) * 1990-08-03 1991-11-12 Security Tag Systems, Inc. Magnetically-coupled, two-resonant-circuit, frequency-division tag
DE69125985T2 (en) * 1990-08-03 1997-12-11 Sensormatic Electronics Corp Magnetically coupled, dual resonance circuit, frequency division label

Also Published As

Publication number Publication date
EP0561559B1 (en) 1996-06-19
NO930935L (en) 1993-09-20
ATE139638T1 (en) 1996-07-15
JP3293936B2 (en) 2002-06-17
AU3521893A (en) 1993-09-23
DE69303204T2 (en) 1997-02-20
AU671932B2 (en) 1996-09-12
CA2091728C (en) 2001-04-03
AU7881794A (en) 1995-02-02
NO930935D0 (en) 1993-03-16
DE69303204D1 (en) 1996-07-25
EP0561559A1 (en) 1993-09-22
JPH0643256A (en) 1994-02-18
AU656259B2 (en) 1995-01-27
US5241298A (en) 1993-08-31

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed