DEACTIVATABLE TRANSPONDER

摘要

A transponder for an electro magnetic detection system, comprising at least one signal element from soft magnetic material. Adjacent to the said signal element at least one deactivating element from hard magnetic material is provided. In the deactivated condition of the transponder the deactivating element is magnetized according to a pattern of magnetic N- and Z-poles. By the magnetic field from said poles the signal element is brought in the saturated condition. In the active condition of the transponder the deactivating element is demagnetized, by which the signal element is in the unsaturated condition. The deactivating element comprises particles from hard magnetic material having an at-random geometric orientation.