Transponder with tamper protection

摘要

The invention relates to sewable tamper detection elements for radio frequency identification devices, and to radio frequency identification devices with such tamper detection elements. The devices can be sewn into a seam of a garment so that the tamper detection element is partially inside the garment, e.g. as part of a care label. This makes removing the device difficult without breaking the tamper detection element, and thereby shoplifting attempts can be more reliably noticed. For this purpose, the tamper detection element is formed so that sewing through it does not break the element. The radio frequency identification device may be formed asymmetric so that the tamper detection element is on a different side from the antenna elements with respect to the chip. In this manner, the disturbance from the tamper detection element to the antenna can be minimized. The tamper detection element may be formed so that it contains a transparent opening on which text can be printed.

主权项

1. A tamper-protection loop element for use in a tamper-protection loop of a radio-frequency transponder configured to be affixed to an object, the tamper-protection loop element comprising an electrically conductive material forming an electrically conductive circuit that is configured to be sewn onto the object, wherein an electrical conductivity of the tamper-protection loop element is maintained despite any openings formed in the electrically conductive material resulting from the sewing.