Patent ID: 6693511
Filing Date: 2004-02-17
Classification: G01S

Abstract:
A method of transmitting data between a transceiver having a transmit coil and a dormant radio frequency identification (RFID) transponder having a receiving coil, the method comprising:providing a transponder in a first state, said transponder comprising a sensor, wherein the sensor is operable to initiate generation of a wake up signal by said transponder placing said transponder in a second state; generating a localized radio frequency signal having a first frequency and first intensity in proximity to said transponder using said transmit coil; sensing said radio frequency signal at said first frequency with said receiving coil; generating a wake up signal within said transponder when said first intensity of said radio frequency signal exceeds a predetermined value and said sensor initiates said generation of said wake up signal, said wake up signal removing said transponder from said first state and placing it in said second state; and transmitting data between said transceiver and said transponder when said transponder is in said second state.