SHIELDED,CLOSELY SPACED TRANSMIT-RECEIVER ANTENNAS FOR ELECTRONIC ARTICLE SURVEILLANCE SYSTEM

摘要

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.