Measurement of backscatter RFID-transponders

This paper demonstrates a measurement technique for the frontend circuit and the completed system of a RFID transponder at UHF, based on the self-designed RFID reader and transponder. A brief introduction of the system is given, along with the detailed measurement procedure and measurement result. The proposed analog frontend circuit achieves a maximum RF-to-DC power conversion efficiency of 30 % for a DC voltage of 1 V; the completed transponder is verified to communicate with the reader successfully for additional sensing functionality.