SHIELDED LOOP FOR ELECTRONIC SURVEILLANCE SYSTEM

A shielded, closely spaced transmit-receiver system for use in an electronic article surveillance system is disclosed wherein at least one of the antennas is provided with at least two twisted loops lying in a common plane each loop being twisted 180 DEG to be in phase opposition with the adjacent l...

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Bibliographic Details
Main Author DEAN MICHAEL DOWDLE
Format Patent
LanguageEnglish
Published 10.01.1985
Edition3
Subjects
ALARM SYSTEMS
ANTENNAS, i.e. RADIO AERIALS
BASIC ELECTRIC ELEMENTS
ELECTRICITY
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Summary:A shielded, closely spaced transmit-receiver system for use in an electronic article surveillance system is disclosed wherein at least one of the antennas is provided with at least two twisted loops lying in a common plane each loop being twisted 180 DEG to be in phase opposition with the adjacent loop and wherein both antennas are substantially enclosed by a conductive shield having a discontinuity in an outer portion enclosing each of the twisted loops.
Bibliography:Application Number: AU19840028971