ANTENNA FOR A COMBINATION EAS/RFID TAG WITH A DETACHER

摘要

A security device detaches a combination electronic article surveillance (EAS)
and radio frequency identification (RFID) tag (EAS/RFID tag), and includes a
detacher (magnet) to selectively disengage a clutch release disposed in a
first portion of the combination EAS/RFID tag, a near field circular
microstrip antenna configured to electronically read information stored in a
second portion of the combination EAS/RFID tag. The antenna encircles the
detacher and reads information from the second portion of the combination
EAS/RFID tag at a position relative to the detacher when the second portion of
the tag is disposed at any angle relative to the detacher and only when the
detacher is positioned to disengage the clutch release. As long as the portion
of the EAS/RFID tag containing the clutch end mechanism is located over the
detaching magnet, the RFID label is in a valid detection zone regardless of
its orientation relative to the antenna.