Title :
Impedance measurement of a UHF RFID transponder by evaluating the rectified voltage
Author :
Heiss, Michael ; Gay, Nicolas ; Fischer, Wolf-Joachim
Author_Institution :
Fraunhofer IPMS, Dresden, Germany
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.
Keywords :
UHF measurement; electric impedance measurement; network analysers; radiofrequency identification; transponders; voltage measurement; RFID chip design; UHF RFID transponder; frequency 868 MHz; impedance measurement; network analyzer; rectified voltage evaluating; rectifier; voltage output measurement; Impedance matching; Impedance measurement; Microwave measurements; RFID tags;
Conference_Titel :
Microwaves, Communications, Antennas and Electronics Systems (COMCAS), 2011 IEEE International Conference on
Conference_Location :
Tel Aviv
Print_ISBN :
978-1-4577-1692-8
DOI :
10.1109/COMCAS.2011.6105796
