Dual function straps for resonant and ultra short wave antennas

摘要

The combined EAS and RFID circuit includes an HF coil antenna, a UHF tuning loop, and an RFID chip coupled to a strap that includes a first coupling region and a second coupling region. The coil end of the HF coil antenna is configured to capacitively and / or conductively couple to one or both of the first coupling region and the second coupling region of the strap. HF coil antennas can include gaps between turns due to the non-interfering arrangement of the UHF tuning loop. The EAS circuit can be deactivated upon application of a sufficient intensity field at a resonant frequency that exceeds the breakdown voltage between the coil ends and the coupling region. The breakdown threshold voltage between the coil end and the coupling region can be reduced by laser ablation of one or both conductive surfaces of the coil end or the coupling region. [Selection diagram] Fig. 1