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FI900673A0 - Antennsystem foer detektering av magnet- och resonanskretsar. - Google Patents

Antennsystem foer detektering av magnet- och resonanskretsar.

Info

Publication number
FI900673A0
FI900673A0 FI900673A FI900673A FI900673A0 FI 900673 A0 FI900673 A0 FI 900673A0 FI 900673 A FI900673 A FI 900673A FI 900673 A FI900673 A FI 900673A FI 900673 A0 FI900673 A0 FI 900673A0
Authority
FI
Finland
Prior art keywords
resonanskretsar
antennsystem
och
magnet
detektering
Prior art date
Application number
FI900673A
Other languages
English (en)
Inventor
George J Lichtblau
Original Assignee
Lichtblau G J
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 Lichtblau G J filed Critical Lichtblau G J
Publication of FI900673A0 publication Critical patent/FI900673A0/fi

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout
    • 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
    • H01Q7/04—Screened antennas

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Burglar Alarm Systems (AREA)
FI900673A 1985-01-10 1990-02-12 Antennsystem foer detektering av magnet- och resonanskretsar. FI900673A0 (fi)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/690,165 US4751516A (en) 1985-01-10 1985-01-10 Antenna system for magnetic and resonant circuit detection
PCT/US1988/002106 WO1989012916A1 (en) 1985-01-10 1988-06-13 Antenna system for magnetic and resonant circuit detection

Publications (1)

Publication Number Publication Date
FI900673A0 true FI900673A0 (fi) 1990-02-12

Family

ID=574739

Family Applications (1)

Application Number Title Priority Date Filing Date
FI900673A FI900673A0 (fi) 1985-01-10 1990-02-12 Antennsystem foer detektering av magnet- och resonanskretsar.

Country Status (7)

Country Link
US (1) US4751516A (fi)
EP (1) EP0386134B1 (fi)
JP (1) JPH03500699A (fi)
DE (1) DE3851761T2 (fi)
DK (1) DK36090A (fi)
FI (1) FI900673A0 (fi)
WO (1) WO1989012916A1 (fi)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4902948A (en) * 1985-05-02 1990-02-20 Eaton-Kenway, Inc. Guide wire communication system and method
US5103234A (en) * 1987-08-28 1992-04-07 Sensormatic Electronics Corporation Electronic article surveillance system
US4999641A (en) * 1989-09-01 1991-03-12 Monarch Marking Systems, Inc. Magnetic antenna system having independently controllable electrical field shielding and magnetic field balance
GB2274207B (en) * 1989-09-01 1994-10-05 Sensormatic Electronics Corp Magnetic antenna system having independently controllable electrical field shielding and magnetic field balance
US5061941A (en) * 1990-02-01 1991-10-29 Checkpoint Systems, Inc. Composite antenna for electronic article surveillance systems
US5187664A (en) * 1990-11-27 1993-02-16 Eaton-Kenway, Inc. Proportional position-sensing system for an automatic guided vehicle
US5216605A (en) * 1990-06-28 1993-06-01 Eaton-Kenway, Inc. Update marker system for navigation of an automatic guided vehicle
US5281901A (en) * 1990-12-03 1994-01-25 Eaton-Kenway, Inc. Downward compatible AGV system and methods
US5051726A (en) * 1990-08-14 1991-09-24 Sensormatic Electronics Corporation Electronic article surveillance system with antenna array for enhanced field falloff
US5127486A (en) * 1990-11-23 1992-07-07 Eaton-Kenway, Inc. System for sensing arrival of an automatic guided vehicle at a wire
US5175415A (en) * 1990-11-27 1992-12-29 Eaton-Kenway, Inc. Combination drive-wheel mechanism and travel-sensor mechanism
EP0578701B1 (en) * 1991-04-03 1999-10-20 Integrated Silicon Design Pty. Ltd Article sorting system
AU664544B2 (en) * 1991-04-03 1995-11-23 Tagsys Sa Article sorting system
US5404147A (en) * 1992-10-28 1995-04-04 Sensormatic Electronics Corporation EAS system loop antenna having three loops of different area
US5387900A (en) * 1992-11-19 1995-02-07 Sensormatic Electronics Corporation EAS system with improved processing of antenna signals
CH684661A5 (de) * 1992-12-11 1994-11-15 Kobe Properties Ltd Verfahren und Vorrichtung zur Diebstahlsicherung von Gegenständen.
US5373301A (en) * 1993-01-04 1994-12-13 Checkpoint Systems, Inc. Transmit and receive antenna having angled crossover elements
DE59406653D1 (de) * 1993-07-13 1998-09-17 Actron Entwicklungs Ag Antennenvorrichtung
US5539646A (en) * 1993-10-26 1996-07-23 Hk Systems Inc. Method and apparatus for an AGV inertial table having an angular rate sensor and a voltage controlled oscillator
GB9506909D0 (en) * 1995-04-04 1995-05-24 Scient Generics Ltd Spatial magnetic interrogation system
GB2313745B (en) * 1995-04-04 1999-11-10 Flying Null Ltd Spatial magnetic interrogation
US5602556A (en) * 1995-06-07 1997-02-11 Check Point Systems, Inc. Transmit and receive loop antenna
AUPO055296A0 (en) 1996-06-19 1996-07-11 Integrated Silicon Design Pty Ltd Enhanced range transponder system
DE29619668U1 (de) * 1996-11-12 1997-02-06 Siemens AG, 80333 München Antennenanordnung einer Vorrichtung zum Erkennen eines in einem Kraftfahrzeug auf einem Fahrzeugsitz angeordneten Kindersitzes
DE19722078A1 (de) * 1997-05-27 1998-12-03 Meto International Gmbh System zur Überwachung von elektromagnetisch gesicherten Artikeln in mehreren Überwachungszonen
US5990791A (en) * 1997-10-22 1999-11-23 William B. Spargur Anti-theft detection system
SE514773C2 (sv) * 1998-09-28 2001-04-23 Allgon Ab Radiokommunikationsenhet och antennsystem
EP1158601A1 (de) * 2000-05-15 2001-11-28 Häni Prolectron Ag Trägerelement für eine Antenne mit geringer Handempfindlichkeit
US7189757B2 (en) * 2001-10-16 2007-03-13 Hypnion, Inc. Treatment of sleep disorders using CNS target modulators
US6946963B2 (en) 2001-10-16 2005-09-20 Spectra Research, Inc. Secure storage disc and disc surveillance system
CN100583554C (zh) * 2003-08-29 2010-01-20 精工爱普生株式会社 环形天线装置
FR2879831B1 (fr) * 2004-12-21 2008-07-11 Tagsys Sa Agencement d'antennes
DE102006041914A1 (de) * 2006-09-07 2008-03-27 Dräger Medical AG & Co. KG Radiofrequenzerfassungssystem für eine medizinische Vorrichtung und Verfahren
WO2010028296A1 (en) 2008-09-04 2010-03-11 Allflex Usa, Inc. Combination full-duplex and half-duplex electronic identification tag
DE102008063909B4 (de) * 2008-12-19 2012-12-13 Stonegarden Technologies Gmbh Einrichtung zur Identifikation von Papierrollen
WO2011041849A1 (en) * 2009-10-09 2011-04-14 Aleis Pty Ltd Radio frequency identification reader antenna having a dynamically adjustable q-factor
EP2486665B1 (en) * 2009-10-09 2016-11-23 Allflex Usa, Inc. Hdx demodulator
CA2783571C (en) * 2009-11-04 2018-01-09 Allflex Usa, Inc. Signal cancelling transmit/receive multi-loop antenna for a radio frequency identification reader
US8576114B2 (en) * 2011-06-24 2013-11-05 Thales Canada Inc. Location of a transponder center point
WO2016043765A1 (en) * 2014-09-19 2016-03-24 Apple Inc. Balanced magnetic array
JP6392715B2 (ja) 2015-08-17 2018-09-19 日本電信電話株式会社 ループアンテナアレイ群
JP6069548B1 (ja) * 2016-01-22 2017-02-01 日本電信電話株式会社 ループアンテナアレイ群

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL42338A (en) * 1972-05-26 1978-06-15 Solomon Heytow Metal detector
US4016553A (en) * 1975-06-27 1977-04-05 Knogo Corporation Article detection system with near field electromagnetic wave control
US4243980A (en) * 1978-02-17 1981-01-06 Lichtblau G J Antenna system for electronic security installations
US4251808A (en) * 1979-11-15 1981-02-17 Lichtblau G J Shielded balanced loop antennas for electronic security systems
US4373163A (en) * 1980-07-14 1983-02-08 I.D. Engineering, Inc. Loop antenna for security systems
GB2173000B (en) * 1985-03-28 1988-08-10 Texaco Development Corp Dielectric well logging system with electrostatically shielded coils

Also Published As

Publication number Publication date
JPH03500699A (ja) 1991-02-14
DE3851761D1 (de) 1994-11-10
WO1989012916A1 (en) 1989-12-28
DK36090A (da) 1990-04-11
US4751516A (en) 1988-06-14
EP0386134A1 (en) 1990-09-12
EP0386134A4 (en) 1992-03-18
DE3851761T2 (de) 1995-02-02
EP0386134B1 (en) 1994-10-05
DK36090D0 (da) 1990-02-12

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Legal Events

Date Code Title Description
FD Application lapsed
FD Application lapsed

Owner name: CHECKPOINT SYSTEMS, INC.