AU573602B2 - Anti-theft system using microstrip antennas - Google Patents

Anti-theft system using microstrip antennas

Info

Publication number
AU573602B2
AU573602B2 AU31220/84A AU3122084A AU573602B2 AU 573602 B2 AU573602 B2 AU 573602B2 AU 31220/84 A AU31220/84 A AU 31220/84A AU 3122084 A AU3122084 A AU 3122084A AU 573602 B2 AU573602 B2 AU 573602B2
Authority
AU
Australia
Prior art keywords
ground plane
patch
metal
patches
spacing
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.)
Ceased
Application number
AU31220/84A
Other versions
AU3122084A (en
Inventor
Philip Fancher
Samuel Sensiper
Harold B Williams
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.)
Zeneca Inc
Original Assignee
ICI Americas 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 ICI Americas Inc filed Critical ICI Americas Inc
Publication of AU3122084A publication Critical patent/AU3122084A/en
Application granted granted Critical
Publication of AU573602B2 publication Critical patent/AU573602B2/en
Anticipated expiration legal-status Critical
Ceased 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
    • G08B13/2422—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
    • 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
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • 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

Abstract

An electronic article surveillance system for microwave frequencies (500 MHz and higher) has microstrip antenna arrays each array comprising a dielectric substrate having a plurality of metal patches, spaced apart in the normal direction of travel through a surveillance zone, on one side and a metal ground plane on the other side. Each metal patch and the adjacent portion of the ground plane together form a cavity resonator which resonates at a desired transmitter or return signal frequency and thereby form a signal radiating or receiving structure. The patch size, patch to ground plane spacing, and spacing between patches are determined by the desired resonant frequency.
AU31220/84A 1983-08-02 1984-07-27 Anti-theft system using microstrip antennas Ceased AU573602B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51956683A 1983-08-02 1983-08-02
US519566 1983-08-02

Publications (2)

Publication Number Publication Date
AU3122084A AU3122084A (en) 1985-02-07
AU573602B2 true AU573602B2 (en) 1988-06-16

Family

ID=24068862

Family Applications (1)

Application Number Title Priority Date Filing Date
AU31220/84A Ceased AU573602B2 (en) 1983-08-02 1984-07-27 Anti-theft system using microstrip antennas

Country Status (9)

Country Link
EP (1) EP0133317B1 (en)
JP (1) JPS60100295A (en)
AT (1) ATE37453T1 (en)
AU (1) AU573602B2 (en)
BR (1) BR8403801A (en)
CA (1) CA1236542A (en)
DE (1) DE3474224D1 (en)
MX (1) MX156403A (en)
NZ (1) NZ209069A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647910A (en) * 1985-09-17 1987-03-03 Allied Corporation Selector for AC magnetic inductive field receiver coils
US6005519A (en) * 1996-09-04 1999-12-21 3 Com Corporation Tunable microstrip antenna and method for tuning the same
WO2007127948A2 (en) 2006-04-27 2007-11-08 Sirit Technologies Inc. Adjusting parameters associated with leakage signals
US8248212B2 (en) 2007-05-24 2012-08-21 Sirit Inc. Pipelining processes in a RF reader
US8427316B2 (en) 2008-03-20 2013-04-23 3M Innovative Properties Company Detecting tampered with radio frequency identification tags
US8446256B2 (en) 2008-05-19 2013-05-21 Sirit Technologies Inc. Multiplexing radio frequency signals
US8169312B2 (en) 2009-01-09 2012-05-01 Sirit Inc. Determining speeds of radio frequency tags
US8416079B2 (en) 2009-06-02 2013-04-09 3M Innovative Properties Company Switching radio frequency identification (RFID) tags
US10062025B2 (en) 2012-03-09 2018-08-28 Neology, Inc. Switchable RFID tag
US10367259B2 (en) 2017-01-12 2019-07-30 Arris Enterprises Llc Antenna with enhanced azimuth gain

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895368A (en) * 1972-08-09 1975-07-15 Sensormatic Electronics Corp Surveillance system and method utilizing both electrostatic and electromagnetic fields

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO126975B (en) * 1967-03-30 1973-04-16 John Welsh
US3680136A (en) * 1971-10-20 1972-07-25 Us Navy Current sheet antenna
US3921177A (en) * 1973-04-17 1975-11-18 Ball Brothers Res Corp Microstrip antenna structures and arrays
GB1604220A (en) * 1978-04-24 1981-12-02 Parmeko Ltd Detection systems
CA1190970A (en) * 1980-10-09 1985-07-23 Harold B. Williams Dual frequency anti-theft system
US4386357A (en) * 1981-05-21 1983-05-31 Martin Marietta Corporation Patch antenna having tuning means for improved performance

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895368A (en) * 1972-08-09 1975-07-15 Sensormatic Electronics Corp Surveillance system and method utilizing both electrostatic and electromagnetic fields

Also Published As

Publication number Publication date
MX156403A (en) 1988-08-18
CA1236542A (en) 1988-05-10
EP0133317B1 (en) 1988-09-21
AU3122084A (en) 1985-02-07
JPS60100295A (en) 1985-06-04
BR8403801A (en) 1985-07-09
EP0133317A3 (en) 1985-03-27
EP0133317A2 (en) 1985-02-20
NZ209069A (en) 1988-03-30
DE3474224D1 (en) 1988-10-27
ATE37453T1 (en) 1988-10-15

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