CA2217459A1 - Eas system antenna configuration for providing improved interrogation field distribution - Google Patents

Eas system antenna configuration for providing improved interrogation field distribution

Info

Publication number
CA2217459A1
CA2217459A1 CA002217459A CA2217459A CA2217459A1 CA 2217459 A1 CA2217459 A1 CA 2217459A1 CA 002217459 A CA002217459 A CA 002217459A CA 2217459 A CA2217459 A CA 2217459A CA 2217459 A1 CA2217459 A1 CA 2217459A1
Authority
CA
Canada
Prior art keywords
loops
field distribution
phase
antenna configuration
providing improved
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
CA002217459A
Other languages
French (fr)
Other versions
CA2217459C (en
Inventor
Jorge Alicot
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 LLC
Original Assignee
Sensormatic Electronics Corporation
Jorge Alicot
Tyco Acquisition Corp. Xxiv
Sensormatic Electronics, LLC
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 Sensormatic Electronics Corporation, Jorge Alicot, Tyco Acquisition Corp. Xxiv, Sensormatic Electronics, LLC filed Critical Sensormatic Electronics Corporation
Priority claimed from PCT/US1996/007442 external-priority patent/WO1996038877A1/en
Publication of CA2217459A1 publication Critical patent/CA2217459A1/en
Application granted granted Critical
Publication of CA2217459C publication Critical patent/CA2217459C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

In an electronic article surveillance system (24), quadrature transmitting and receiving antennas are used to improve field distribution.
A transmitting antenna arrangement includes first and second adjacent co-planar antenna loops (42, 44) and excitation circuitry (46) for generating respective alternating currents in the first and second loops such that the respective alternating currents are 90° out of phase. In a receiving arrangement (300), respective signals received from two adjacent co-planar antenna loops (302, 304) are respectively phase-shifted by +45° and -45° and the resulting phase-shifted signals are summed. A far-field canceling transmitting antenna arrangement includes four loops (66', 78, 68, 70) operated at phases of 0°, 90°, 180° and 270° respectively. All four loops may be co-planar, with any bucking vertical segments being horizontally displaced from each other. Alternatively, the 0° and 180° loops may also be arranged in a common plane that is close to and parallel with another plane in which the 90°
and 270° loops are arranged.
CA002217459A 1995-05-30 1996-05-22 Eas system antenna configuration for providing improved interrogation field distribution Expired - Fee Related CA2217459C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US45296895A 1995-05-30 1995-05-30
US08/452,968 1995-05-30
PCT/US1996/007442 WO1996038877A1 (en) 1995-05-30 1996-05-22 Eas system antenna configuration for providing improved interrogation field distribution

Publications (2)

Publication Number Publication Date
CA2217459A1 true CA2217459A1 (en) 1996-12-05
CA2217459C CA2217459C (en) 2006-04-25

Family

ID=36253020

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002217459A Expired - Fee Related CA2217459C (en) 1995-05-30 1996-05-22 Eas system antenna configuration for providing improved interrogation field distribution

Country Status (1)

Country Link
CA (1) CA2217459C (en)

Also Published As

Publication number Publication date
CA2217459C (en) 2006-04-25

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20130522