The present invention relates to transfer methods of wireless power to non-self-powered biometric authentication devices through far-field radio waves coming from a nearby self powered radio frequency device. By default , the non-self powered biometric authentication device of the invention is made of a far-field radio microwave antenna , an antenna tuner , a RF-to-DC power rectifier and power
... [Show full abstract] converter functions. The transfer methods of wireless power to non self-powered biometric authentication devices of the inven tion are particularly well-suited for self-enrolment of one user's identity on biometric smart cards but can also be applied for subsequent data exchange such as peer-to-peer money transfer. Publication Classification (51) Int. Ci .