Autonomous RFID Sensor Node Using a Single ISM Band for Both Wireless Power Transfer and Data Communication

Abderrahim Okba (1) , Dominique Henry , Alexandru Takacs (1) , Hervé Aubert (1)

1 LAAS-MINC - Équipe MIcro et Nanosystèmes pour les Communications sans fil

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.

Mots clés: autonomous wireless sensor nodes; wireless power transfer; rectenna; RFID sensor tag

Domaines: Electromagnétisme; Micro et nanotechnologies/Microélectronique

Abderrahim Okba, Dominique Henry, Alexandru Takacs, Hervé Aubert. Autonomous RFID Sensor Node Using a Single ISM Band for Both Wireless Power Transfer and Data Communication. Sensors, 2019, 19, ⟨10.3390/s19153330⟩. ⟨hal-03698559⟩