RF IDENTIFICATION TAG

摘要

A radio frequency identification (RFID) tag, wherein at least two resonators circuits having random resonant responses are provided and the response curves thereof measured to generate a unique identifier in respect of the tag. In one configuration, the coils of two resonator circuits are provided on opposing metal layers, and arranged such that they overlap relative to each other to the extent that the inductive coupling is substantially zero. In an alternative configuration, the tag comprises two coplanar coils, one located within the other. In a third configuration, two resonator circuits are randomly capacitively coupled.