A Planar Microwave Cavity Loaded with Ferrromagnetic Material: a new 8.2 MHz Anti-Theft Tag for Metallic Packaging within the Retail Sector

点击翻译按钮获取中文摘要

We propose to develop a new type of anti-theft tag based upon a planar microwave cavity loaded with ferromagnetic material. Many retail outlets currently use a system of tagging and detection developed by Checkpoint Systems Inc. for the protection of merchandise. The conventional planar tag is activated by an 8.2 MHz frequency alternating magnetic field applied perpendicular to its plane, rendering it ineffective on metallic surfaces due to eddy current shielding. The new tag is instead activated by an in-plane magnetic field. It will safeguard an important business sector for Crown Packaging UK, a leading manufacturer of metal packaging.