Adaptive carrier supression for UHF RFID using digitally tunable capacitors

Küng, Roland; Koller, Marcel

doi:10.21256/zhaw-3333

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-3333

Publication type:	Conference paper
Type of review:	Peer review (abstract)
Title:	Adaptive carrier supression for UHF RFID using digitally tunable capacitors
Authors:	Küng, Roland Koller, Marcel
DOI:	10.21256/zhaw-3333
Proceedings:	Proceedings of the 43rd European Microwave Conference
Conference details:	2013 European Microwave Conference, Nuremberg, Germany, 6-10 October 2013
Issue Date:	2013
Publisher / Ed. Institution:	IEEE
ISBN:	978-2-87487-031-6
Language:	English
Subjects:	RFID; Reader; UHF; Suppression
Subject (DDC):	004: Computer science 621.3: Electrical, communications, control engineering
Abstract:	In UHF (Ultra High Frequency) RFID (Radio Frequency Identification) systems Rx (Receiver) is usually isolated from Tx (Transmitter) by a circulator or a directional coupler. Since tags become more sensitive in order to improve reading distance, the relatively poor isolation of 20dB – 30dB limits the tag to reader link. A way to improve a directional coupler’s isolation is to mismatch the unused port to generate a carrier cancelling signal. In this paper an impedance network using digitally tunable capacitors is proposed. The advantage of this solution is that changes in the system – like antenna characteristics or cable length - can be recalibrated at any time by a controller. Finally an isolation of minimum 47dB for any antenna characteristic (minimum return loss of 18dB) and any cable length was reached. Also an algorithm was implemented on a simple MSP430 controller to find the optimum impedance to minimize carrier leakage.
URI:	https://ieeexplore.ieee.org/document/6686814 https://digitalcollection.zhaw.ch/handle/11475/16473
Fulltext version:	Accepted version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Signal Processing and Wireless Communications (ISC)
Appears in collections:	Publikationen School of Engineering

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Küng, R., & Koller, M. (2013). Adaptive carrier supression for UHF RFID using digitally tunable capacitors. Proceedings of the 43rd European Microwave Conference. https://doi.org/10.21256/zhaw-3333

Küng, R. and Koller, M. (2013) ‘Adaptive carrier supression for UHF RFID using digitally tunable capacitors’, in Proceedings of the 43rd European Microwave Conference. IEEE. Available at: https://doi.org/10.21256/zhaw-3333.

R. Küng and M. Koller, “Adaptive carrier supression for UHF RFID using digitally tunable capacitors,” in Proceedings of the 43rd European Microwave Conference, 2013. doi: 10.21256/zhaw-3333.

KÜNG, Roland und Marcel KOLLER, 2013. Adaptive carrier supression for UHF RFID using digitally tunable capacitors. In: Proceedings of the 43rd European Microwave Conference [online]. Conference paper. IEEE. 2013. ISBN 978-2-87487-031-6. Verfügbar unter: https://ieeexplore.ieee.org/document/6686814

Küng, Roland, and Marcel Koller. 2013. “Adaptive Carrier Supression for UHF RFID Using Digitally Tunable Capacitors.” Conference paper. In Proceedings of the 43rd European Microwave Conference. IEEE. https://doi.org/10.21256/zhaw-3333.

Küng, Roland, and Marcel Koller. “Adaptive Carrier Supression for UHF RFID Using Digitally Tunable Capacitors.” Proceedings of the 43rd European Microwave Conference, IEEE, 2013, https://doi.org/10.21256/zhaw-3333.