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Temporally resolved impedance measurement of differential, RF-powered devices using the example of a µWave RFID front-end

: Bansleben, C.; Kühn, S.; Gay, N.; Fischer, W.-J.


IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Microwave Symposium, IMS 2010 : May 23-28, 2010, Anaheim, California
Piscataway/NJ: IEEE, 2010
ISBN: 978-1-4244-6056-4
ISBN: 1-4244-6056-5
ISBN: 978-1-4244-6057-1
ISBN: 978-1-4244-7732-6
International Microwave Symposium (IMS) <2010, Anaheim/Calif.>
Conference Paper
Fraunhofer IPMS ()
RFID; Mixed-Mode; S-Parameter; differential time-domain; RF-powered impedance

This work was motivated by the idea to monitor the input impedance of differential front-ends of passive RFID-transponders depending on their power-consumption. Different methods readily available in state-of-the-art network analyzers are compared with regard to the special demands imposed by passive RFID front-ends. At this the correct stimulation of the DUT appears to be the major issue of conventional methods. Hereupon a new approach is proposed which for the first time combines the proper stimulation of differential, RF-powered devices with the data aquisition of differential mixed-mode S-parameters in temporal resolution. The new measurement method is applied to a 2.45 GHz RFID transponder showing detailed mixed-mode results of its power-up behavior.