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We present wireless impedance measurement for passive UHF RFID tag chips. The measurements are performed on the tag chip when it is connected to the tag antenna in the balanced mode as it operates; neither test fixture nor matching network is needed. The chip impedance measurement in absorbing state and reflecting state by using a time-domain vector reflectometer system. The experimental results are...
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...
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