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Impedance measurement of a UHF RFID transponder by evaluating the rectified voltage

 
: Heiß, M.; Gay, N.; Fischer, W.-J.

:

Institute of Electrical and Electronics Engineers -IEEE-:
IEEE COMCAS 2011, 3rd International Conference on Microwaves, Communications, Antennas and Electronic Systems : Hilten Hotel, Tel Aviv, Israel, November 7-9, 2011
Piscataway/NJ: IEEE, 2011
ISBN: 978-1-4577-1692-8
ISBN: 1-4577-1692-5
Art. 6105796
International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMACS) <3, 2011, Tel Aviv>
English
Conference Paper
Fraunhofer IPMS ()

Abstract
A main task in RFID chip design is the determination of its input impedance. Standard methods involving the use of a state-of-the-art network analyzer require expensive equipment. Here a new approach is proposed to determine the impedance by measuring the voltage output of the rectifier stage of an 868 MHz RFID tag. The tag is connected to several antennas with different impedances and for each the voltage after the rectifier is measured. These values are used to determine the input impedance.

: http://publica.fraunhofer.de/documents/N-208905.html