Patent ID: 7986241
Filing Date: 2011-07-26
Classification: G08B,H01Q

Abstract:
1. A security tag comprising: an acousto magnetic (“AM”) electronic article surveillance (“EAS”) component, the AM EAS component including a housing with a defined surface area, the defined surface area having a perimeter boundary and defining an EAS component plane; and a radio frequency identification (“RFID”) component, the RFID component including an RFID integrated circuit and a dipole antenna, the integrated circuit and the dipole antenna defining a RFID component plane, the RFID component plane being substantially coplanar with the EAS component plane, the integrated circuit and the dipole antenna being positioned externally along the perimeter boundary of the AM EAS component, a first branch of the dipole antenna folded around a first half of the perimeter boundary of the AM EAS component, a second branch of the dipole antenna folded around a second half of the perimeter boundary of the AM EAS component, the first branch and the second branch being coplanar with the EAS component plane and forming a gap between ends of the first and second branches, the gap being on an opposite side of the perimeter boundary from a location of the RFID integrated circuit; wherein the RFID antenna has an antenna impedance that includes the proximity effects of the EAS component, and wherein an impedance of the RFID antenna is approximately the complex conjugate of the RFID chip.