EP0634807B1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
EP0634807B1
EP0634807B1 EP94810334A EP94810334A EP0634807B1 EP 0634807 B1 EP0634807 B1 EP 0634807B1 EP 94810334 A EP94810334 A EP 94810334A EP 94810334 A EP94810334 A EP 94810334A EP 0634807 B1 EP0634807 B1 EP 0634807B1
Authority
EP
European Patent Office
Prior art keywords
antenna device
loop
electrically
antenna
partial
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.)
Expired - Lifetime
Application number
EP94810334A
Other languages
German (de)
English (en)
Other versions
EP0634807A1 (fr
Inventor
Philipp Müller
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.)
Actron Entwicklungs AG
Original Assignee
Actron Entwicklungs AG
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 Actron Entwicklungs AG filed Critical Actron Entwicklungs AG
Publication of EP0634807A1 publication Critical patent/EP0634807A1/fr
Application granted granted Critical
Publication of EP0634807B1 publication Critical patent/EP0634807B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2477—Antenna or antenna activator circuit
    • 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

Definitions

  • the present invention relates to an antenna device for the detection of resonance labels in electronic anti-theft security systems with one between two clamps antenna wire loop guided in one plane, which under Formation of two electrically outer and one electrically middle part loop twisted twice in each case by 180 ° and in which an impedance element is connected.
  • the invention further relates to the use of such Antenna device for the detection of resonance labels with a fixed predetermined resonance frequency.
  • Antenna devices for electronic anti-theft systems are in various designs and Geometries known and also in use. For example reference is made to: US-A-4,251,808, US-A-4,135,183, US-A-4,243,980, US-A-4,751,516, US-A-872,018, US-A-4,260,990, US-A-4,016,553, US-A-4,720,701, EP-A2-0414628, FR-763.681. Reference may also be made to US-A-2,597,518, in which already a receiving antenna with several against each other 180 ° twisted partial loops is described.
  • Fig. 1 an antenna device is shown as it is currently widely used. It shows in series three also partial loops rotated against each other by 180 ° 1, 2 and 3. The twisting of the partial loops against each other serves to wipe out the far field.
  • the Andes Crossing points 5 and 6 provided ohmic resistors 7 and 8 have the task of slightly increasing the antenna characteristics "smear" and thereby avoid detection dead zones.
  • Fig. 2 shows one generated by this antenna device Field intensity distribution at a distance of 30 cm above the xy plane of the three partial loops. According to the three part loops there are three maxima, the field intensity decreases from the first partial loop to the third. This unwanted decrease in intensity is due to the von von loop Loop decreasing amperage.
  • the total inductance the antenna device determines or limits in the rest in addition to the voltage present at the antenna terminals the antenna current. This should be as large as possible. At modern systems have about one at the antenna terminals 12 Voltage of 50 volts available. An increase in Antenna current by increasing this voltage is only with considerable effort possible.
  • the antenna device according to the invention becomes resonant frequency preferably used as in the claim 9 specified.
  • 3a shows an antenna device of a conventional type three partial loops 1, 2, 3 arranged in series, each are rotated against each other by 180 °.
  • the electrically outer Partial loop 3 is geometrical here between the partial loops 1 and 2 arranged.
  • an impedance element 11 is provided at intersection 6 between the second and third partial loops 2, 3, respectively between two connection points 9, 10 at the entrance and exit of the third sub-loop 3.
  • the impedance element 11 is, as shown in FIG. 4, by a Parallel connection of a capacitor C and an ohmic Resistor R formed.
  • the inductance L 3 of the geometrically central partial loop 3 forms a resonant circuit together with the capacitor C of the impedance element 11. At its resonance frequency, this resonant circuit acts as a blocking element.
  • the current I 3 flowing in it or in the geometrically central partial loop is in phase of resonance just 90 ° out of phase with the current I 12 in the other two partial loops 1 and 2.
  • the current I 12 flows through the resistor R and "experiences" otherwise advantageously only the inductors L 1 and L 2 of the first and second partial loops.
  • the impedance of the antenna device according to the invention therefore behaves like one with only two or two and a half partial loops for frequencies in the vicinity of the resonant frequency mentioned, despite the three partial loops.
  • FIG. 5 shows in a diagram corresponding to FIG. 2 the characteristic of the antenna device according to FIG. 3d) in the case of resonance. It is much more uniform than that of FIG. 2. In particular, the undesired drop in intensity from left to right has disappeared. The intensity is also higher overall, because the inductance L 3 of the third partial loop has no limiting effect on the antenna current I 12, which is primarily effective.
  • FIG. 7 shows a representation corresponding to FIG. 3 Another embodiment for an inventive Antenna device (Fig.7d)) and its derivation from a conventional arrangement (Fig. 7a) shown. From Fig. 3 7 differs by the arrangement of the antenna terminals 12. In FIG. 3, these are in the first partial loop 1 and in Fig. 7 arranged in the second sub-loop 2. With regard to the geometrically middle partial loop 3 there is an opposite in the two embodiments Current sense. Otherwise, the two embodiments equivalent to each other. The terminals 12 could also in the area of the middle loop part 3 in one of them passing lines can be arranged.
  • the area of the three partial loops is preferably the same chosen large. However, there could be different ones Areas are provided.
  • the described coordination of Parameters of the antenna device on the resonance frequency of the resonance labels to be detected need not necessarily be exact be. A phase error (compared to the 90 ° phase shift in the case of resonance) up to 30 ° under certain circumstances be tolerated.
  • Fig. 3d and Fig. 7d) is dashed around the three loops 1,2,3 around a single loop so-called Short circuit loop 14 laid.
  • This serves the To improve extinction of the far field (3 to 30 m). she is optimal when the rivers stretch in the span Compensate each other. If so, then it is the current in the outer loop is zero. Unless, then the current arising in the loop acts on the inner one counter and thereby forces extinction. To avoid of unwanted resonances can replace the short circuit a resistor is also used in the outer loop will.
  • All loops of the invention are advantageous Antenna device embedded in a plastic housing, which mechanically stabilizes them.
  • a plastic case has the advantage that it is based on the advantageous characteristic not disadvantageous to the antenna device according to the invention affects. When combined spatially with a broadcast or receiving electronics should do this for the same reason can also be arranged in a plastic housing.
  • the antenna device according to the invention be shielded on one side for the purpose one-sided shielding.
  • the shield would be in a few centimeters (e.g. 4 cm) from the plane of the Arrange antenna wire loops.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Support Of Aerials (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Radar Systems Or Details Thereof (AREA)

Claims (9)

  1. Dispositif d'antenne pour la détection d'étiquettes à résonance dans les installations de sécurité électroniques contre le vol de marchandises, comprenant un fil d'antenne en boucle guidé dans un plan entre deux bornes (12), tordu deux fois sur lui même de 180° pour former deux boucles électriques partielles extérieures (1, 3) et une boucle électrique partielle médiane (2), et dans lequel on a implanté une impédance (11), caractérisé en ce que l'une (3) des deux boucles électriques partielles extérieures (1, 3) est agencée géométriquement entre la boucle électrique partielle médiane (2) et l'autre boucle électrique partielle extérieure (1), et en ce que l'impédance (11) est mise en circuit entre deux points de connexion (9, 10) agencés à l'entrée et à la sortie de la boucle partielle (3) géométriquement médiane, et présente, montés en parallèle, un condensateur (C) ainsi qu'une résistance ohmique (R).
  2. Dispositif d'antenne selon la revendication 1, caractérisé en ce que les deux bornes (12) sont disposées dans l'autre boucle partielle électrique extérieure (1).
  3. Dispositif d'antenne selon la revendication 1, caractérisé en ce que les deux bornes (12) sont disposées dans la boucle partielle électrique médiane (2).
  4. Dispositif d'antenne selon l'une des revendications 1 à 3, caractérisé en ce que l'équation applicable est L=R2C dans laquelle L représente l'inductance de la boucle partielle (3) géométriquement en position médiane, R la valeur de la résistance ohmique et C, la capacité du condensateur.
  5. Dispositif d'antenne selon l'une des revendications 1 à 4, caractérisé en ce que les trois boucles partielles (1, 2, 3) sont de même surface.
  6. Dispositif d'antenne selon l'une des revendications 1 à 5, caractérisé en ce qu'une boucle de court-circuit (14) est disposée à l'extérieur autour du fil d'antenne en boucle, et tournant dans le même plan.
  7. Dispositif d'antenne selon l'une des revendications 1 à 6, caractérisé en ce qu'une tôle de protection est agencée parallèlement au plan du fil d'antenne en boucle, de préférence à une distance de 4 cm.
  8. Dispositif d'antenne selon l'une des revendications 1 à 7, caractérisé en ce que le(s) fil(s) d'antenne en boucle (1, 2, 3, 14) est/sont noyé(s) dans un boítier en matière plastique.
  9. Utilisation du dispositif d'antenne selon l'une des revendications 1 à 8 pour la détection d'étiquettes à résonance ayant une fréquence de résonance définie au préalable, caractérisée en ce que la résistance ohmique (R), la capacité du condensateur (C) et l'inductance (L3) de la boucle partielle géométriquement médiane (3) sont calculées de façon à ce que les résistances opposées au courant alternatif développées par le condensateur (C) et l'inductance susdite (L3) à la fréquence de résonance prédéfinie des étiquettes à résonance sont, quant à la somme, chaque fois exactement égales à la résistance ohmique.
EP94810334A 1993-07-13 1994-06-06 Dispositif d'antenne Expired - Lifetime EP0634807B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH209493 1993-07-13
CH2094/93 1993-07-13

Publications (2)

Publication Number Publication Date
EP0634807A1 EP0634807A1 (fr) 1995-01-18
EP0634807B1 true EP0634807B1 (fr) 1998-08-12

Family

ID=4225752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94810334A Expired - Lifetime EP0634807B1 (fr) 1993-07-13 1994-06-06 Dispositif d'antenne

Country Status (6)

Country Link
US (1) US5663738A (fr)
EP (1) EP0634807B1 (fr)
JP (1) JP3606603B2 (fr)
AT (1) ATE169776T1 (fr)
DE (1) DE59406653D1 (fr)
ES (1) ES2122209T3 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825335A (en) * 1995-10-23 1998-10-20 Kubota Corporation Sheet antenna apparatus
JPH10303635A (ja) * 1997-04-25 1998-11-13 Matsushita Electric Ind Co Ltd ループアンテナ回路
US5963173A (en) * 1997-12-05 1999-10-05 Sensormatic Electronics Corporation Antenna and transmitter arrangement for EAS system
FR2784524B1 (fr) * 1998-10-12 2006-07-07 Dassault Electronique Antenne perfectionnee, notamment pour un lecteur de badge sans contact
US6166706A (en) * 1998-11-04 2000-12-26 Checkpoint Systems, Inc. Rotating field antenna with a magnetically coupled quadrature loop
US6025807A (en) * 1999-03-12 2000-02-15 Lucent Technologies, Inc. Orientation independent loop antenna
JP3498716B2 (ja) * 2001-02-09 2004-02-16 オムロン株式会社 アンテナ装置
TWI296062B (en) * 2001-12-28 2008-04-21 Sanyo Electric Co Liquid crystal display device
CA2389791C (fr) * 2002-06-20 2004-10-19 James Stanley Podger Elements d'antenne multicadres
CN100583554C (zh) * 2003-08-29 2010-01-20 精工爱普生株式会社 环形天线装置
AU2005239398B2 (en) * 2004-04-28 2007-11-08 Checkpoint Systems, Inc. Electronic article tracking system for retail rack using loop antenna
WO2006008705A1 (fr) * 2004-07-16 2006-01-26 Koninklijke Philips Electronics N.V. Antenne destinee a communiquer avec une multitude de transpondeurs
JP4890097B2 (ja) * 2006-05-19 2012-03-07 日本信号株式会社 磁束発生装置及び物品管理収納装置
US20090135080A1 (en) * 2007-11-28 2009-05-28 Stichting Astron Magnetc radiator arranged with decoupling means
JP2012143061A (ja) * 2010-12-28 2012-07-26 Central Japan Railway Co ２重ループ構造

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US2597518A (en) * 1949-10-17 1952-05-20 Motorola Inc Vehicle detecting system
US4016553A (en) * 1975-06-27 1977-04-05 Knogo Corporation Article detection system with near field electromagnetic wave control
US4135183A (en) * 1977-05-24 1979-01-16 Minnesota Mining And Manufacturing Company Antipilferage system utilizing "figure-8" shaped field producing and detector coils
US4243980A (en) * 1978-02-17 1981-01-06 Lichtblau G J Antenna system for electronic security installations
US4260990A (en) * 1979-11-08 1981-04-07 Lichtblau G J Asymmetrical antennas for use in electronic security systems
US4251808A (en) * 1979-11-15 1981-02-17 Lichtblau G J Shielded balanced loop antennas for electronic security systems
GB2180123B (en) * 1984-12-21 1989-01-18 Senezco Limited Transponder systems
US4633250A (en) * 1985-01-07 1986-12-30 Allied Corporation Coplanar antenna for proximate surveillance systems
US4751516A (en) * 1985-01-10 1988-06-14 Lichtblau G J Antenna system for magnetic and resonant circuit detection
US4866455A (en) * 1985-01-10 1989-09-12 Lichtblau G J Antenna system for magnetic and resonant circuit detection
US4720701A (en) * 1986-01-02 1988-01-19 Lichtblau G J System with enhanced signal detection and discrimination with saturable magnetic marker
US4859991A (en) * 1987-08-28 1989-08-22 Sensormatic Electronics Corporation Electronic article surveillance system employing time domain and/or frequency domain analysis and computerized operation
US4872018A (en) * 1987-08-31 1989-10-03 Monarch Marking Systems, Inc. Multiple loop antenna
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
US5061941A (en) * 1990-02-01 1991-10-29 Checkpoint Systems, Inc. Composite antenna for electronic article surveillance systems
GB9004431D0 (en) * 1990-02-28 1990-04-25 Scient Generics Ltd Detection system for security systems

Also Published As

Publication number Publication date
US5663738A (en) 1997-09-02
ES2122209T3 (es) 1998-12-16
DE59406653D1 (de) 1998-09-17
ATE169776T1 (de) 1998-08-15
JPH07154130A (ja) 1995-06-16
JP3606603B2 (ja) 2005-01-05
EP0634807A1 (fr) 1995-01-18

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