BR9807071A - Antena de circuito múltiplo, e, sistema de vigilância de artigo eletrônico - Google Patents

Antena de circuito múltiplo, e, sistema de vigilância de artigo eletrônico

Info

Publication number
BR9807071A
BR9807071A BR9807071-1A BR9807071A BR9807071A BR 9807071 A BR9807071 A BR 9807071A BR 9807071 A BR9807071 A BR 9807071A BR 9807071 A BR9807071 A BR 9807071A
Authority
BR
Brazil
Prior art keywords
antenna
circuit
surveillance system
multiple circuit
electronic article
Prior art date
Application number
BR9807071-1A
Other languages
English (en)
Inventor
John H Bowers
Wen-Liang Wu
Original Assignee
Cheskpoint 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 Cheskpoint Systems Inc filed Critical Cheskpoint Systems Inc
Publication of BR9807071A publication Critical patent/BR9807071A/pt

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
    • G08B13/2465—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
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/12—Resonant antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • 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

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)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Burglar Alarm Systems (AREA)
  • Near-Field Transmission Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Support Of Aerials (AREA)

Abstract

"ANTENA DE CIRCUITO MúLTIPLO, E, SISTEMA DE VIGILâNCIA DE ARTIGO ELETRôNICO". Uma antena de circuito múltiplo (30) é fornecida que pode ser conectada a cada um circuito de transmissão (64), um circuito de recepção, ou um circuito de transmissão / recepção. Quando energizada pelo circuito de transmissão, a antena gera campos magnéticos de rádio frequência em uma área ou zona próxima à antena, mas que são substancialmente cancelados em uma distância de aproximadamente um comprimento de onda ou mais da antena, por esse meio definindo uma zona de vigilância próxima a antena. Seguimentos de circuito de irradiação (36, 38) da antena são centrados ao redor de uma ponto de alimentação comum e são simétricos geometricamente, de forma que correntes são precisamente controladas em cada seguimento de circuito.
BR9807071-1A 1997-01-14 1998-01-12 Antena de circuito múltiplo, e, sistema de vigilância de artigo eletrônico BR9807071A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/783,423 US5914692A (en) 1997-01-14 1997-01-14 Multiple loop antenna with crossover element having a pair of spaced, parallel conductors for electrically connecting the multiple loops
PCT/US1998/000310 WO1998031070A1 (en) 1997-01-14 1998-01-12 Multiple loop antenna

Publications (1)

Publication Number Publication Date
BR9807071A true BR9807071A (pt) 2000-05-02

Family

ID=25129204

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9807071-1A BR9807071A (pt) 1997-01-14 1998-01-12 Antena de circuito múltiplo, e, sistema de vigilância de artigo eletrônico

Country Status (13)

Country Link
US (1) US5914692A (pt)
EP (1) EP0956613B1 (pt)
JP (1) JP2001508260A (pt)
KR (1) KR100544045B1 (pt)
CN (1) CN1136629C (pt)
AT (1) ATE278252T1 (pt)
AU (1) AU733732B2 (pt)
BR (1) BR9807071A (pt)
CA (1) CA2276412C (pt)
DE (1) DE69826638T2 (pt)
ES (1) ES2230669T3 (pt)
IL (1) IL130767A (pt)
WO (1) WO1998031070A1 (pt)

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Also Published As

Publication number Publication date
AU733732B2 (en) 2001-05-24
KR20000070175A (ko) 2000-11-25
ATE278252T1 (de) 2004-10-15
CN1243609A (zh) 2000-02-02
EP0956613B1 (en) 2004-09-29
IL130767A0 (en) 2001-01-28
EP0956613A1 (en) 1999-11-17
JP2001508260A (ja) 2001-06-19
EP0956613A4 (en) 2001-03-28
CA2276412C (en) 2004-09-21
ES2230669T3 (es) 2005-05-01
KR100544045B1 (ko) 2006-01-23
CN1136629C (zh) 2004-01-28
WO1998031070A1 (en) 1998-07-16
DE69826638T2 (de) 2006-02-23
DE69826638D1 (de) 2004-11-04
US5914692A (en) 1999-06-22
IL130767A (en) 2003-07-31
AU5909698A (en) 1998-08-03
CA2276412A1 (en) 1998-07-16

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