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Coupling passive sensor data to existing UHF RFID tags explores the possibility for low volume applications without designing a new tag ASIC. The existing UHF RFID system can be used to convey additional data by overlaying a coupling loop on the tag antenna and modulating vector backscatter. The design of the RFID passive sensor prototype is presented and the feasibility of this approach is demonstrated...
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...
Washing machines are typical systems with electromechanical coupling vibration. A novel approach is presented for modeling of an inclined drum washing machine system in this paper. Its Lagrangian function and Rayleigh dissipation function are obtained firstly. Then, its detail electromechanical coupling model is established based on Euler-Lagrange theory and variational principles. Notation that the...
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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