METHOD AND APPARATUS FOR GENERATING DEDICATED DATA CHANNELS IN INDUCTIVE COUPLED RFID SYSTEMS USING BAND PASS MODULATION

摘要

An inductive coupling apparatus for modifying an incoming radio frequency (RF) signal includes an inductive element. A variable impedance circuit includes an output electrically coupled to the inductive element. A band -pass delta sigma modulator is coupled to the variable impedance circuit and digitally controls the output of the variable impedance circuit. The incoming RF signal is modified as the coupled impedance of the inductive element is adjusted in accordance with the output of the variable impedance circuit.