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Autonomous RFID Sensor Node Using a Single ISM Band for Both Wireless Power Transfer and Data Communication
Abderrahim Okba1, Dominique Henry2, Alexandru Takacs2
1LAAS-CNRS, Université de Toulouse, CNRS, INSA, UPS, 31400 Toulouse, France. abderrahim.okba@laas.fr.
Abstract:
This paper addresses the implementation of autonomous radiofrequency identification sensor nodes based on wireless power transfer. For size reduction, a switching method is proposed in order to use the same frequency band for both supplying power to the nodes and wirelessly transmitting the nodes' data. A rectenna harvests the electromagnetic energy delivered by the dedicated radiofrequency source for charging a few-mF supercapacitor. For supercapacitors of 7 mF, it is shown that the proposed autonomous sensor nodes were able to wirelessly communicate with the reader at 868 MHz for 10 min without interruption for a tag-to-reader separation distance of 1 meter. This result was obtained from effective radiated powers of 2 W during the supercapacitor charging and of 100 mW during the wireless data communication.
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