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A passive long-range UHF transponder with integrated temperature sensor

: Feldengut, T.; Wang, J.; Kolnsberg, S.; Kokozinski, R.

Hollstein, T. ; Informationstechnische Gesellschaft -ITG-:
RFID SysTech 2008. 4th European Workshop on RFID Systems and Technologies. CD-ROM : June, 10-11, 2008 in Freiburg, Germany
Berlin: VDE-Verlag, 2008 (ITG-Fachbericht 209)
ISBN: 978-3-8007-3106-0
European Workshop on RFID Systems and Technologies (RFID SysTech) <4, 2008, Freiburg>
Conference Paper
Fraunhofer IMS ()
passive UHF transponder; temperature sensor; sensor tag; RFID; Temperatursensor; passiver Transponder

Recent development in UHF RFID Tags has been focused on the optimization of the powering and communication range of the reader/tag system. The use of low threshold Shottky-diode rectifiers and the rigorous minimization of the tag power consumption have yielded read ranges of more than 10 m for simple identification tags. Sensor transponders that serve as nodes in wireless networks require a more complex chip architecture with a stable, regulated supply voltage and precise current- and voltage references. The analog/digital conversion of sensor data leads to short periods of large current consumption on the tag side. A passive UHF sensor tag was designed in a 0.35 µm CMOS process with Schottky diodes and double poly layers. The tag operates in the 868 MHz ISM band and the air interface is compatible to the ISO 18000-6 standard. The analog front-end with temperature sensor consumes 3.5 µA from the DC supply, which leads to an expected range of more than 3 m. The data rate, the size and the maximum range of each sensor node are significantly improved in comparison with existing LF and HF solutions.