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We describe a “piggyback modulation” technique to integrate sensing functions with existing standard passive UHF RFID tags through electromagnetic coupling. Instead of focusing on the scalar backscattered power that is proportional to the radar cross section (RCS), we present vector analysis and measurement for backscattered signals with piggyback modulation. Measuring both amplitude and phase of...
We introduce the technique of “piggybacking” sensor data onto existing commercial passive UHF RFID tags. Sensor data fed into a PIN diode modulator is coupled onto the tag and transmitted along with the tag ID via backscatter. The radar cross section (RCS) of the tag antenna is a function of the input impedance of the tag ASIC, coupling S-parameters, and the input impedance of the PIN diode modulator...
Coupling sensor signals to existing UHF RFID tags enables low volume applications without incurring the additional cost of developing a custom integrated circuit. The feasibility of this approach is demonstrated using the radar cross section as the metric in both simulations and experiments.
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