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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.
This study presents autonomous radio-frequency identification (RFID) sensor nodes powered wirelessly. These nodes achieved 10 minutes of continuous data communication using a shared frequency band for power and data transmission.
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Area of Science:
- Electrical Engineering
- Wireless Communication
- Sensor Technology
Background:
- Autonomous sensor nodes require efficient power solutions.
- Wireless power transfer (WPT) offers a promising alternative to traditional batteries.
- Integrating power and data transmission in a single frequency band is challenging for size reduction.
Purpose of the Study:
- To implement autonomous radio-frequency identification (RFID) sensor nodes using wireless power transfer.
- To propose a switching method for utilizing a single frequency band for both power supply and data transmission.
- To demonstrate the feasibility of size-reduced, self-powered RFID sensor nodes.
Main Methods:
- A switching method was developed to share a frequency band for power and data.
- A rectenna was employed to harvest radiofrequency energy for supercapacitor charging.
- The system was tested using a 7 mF supercapacitor and an 868 MHz frequency band.
Main Results:
- Autonomous sensor nodes successfully communicated wirelessly for 10 minutes continuously.
- Communication was maintained at a 1-meter tag-to-reader separation distance.
- Effective radiated powers of 2 W (charging) and 100 mW (communication) were utilized.
Conclusions:
- The proposed method enables the implementation of autonomous RFID sensor nodes with size reduction.
- Shared frequency band operation for WPT and data transmission is feasible.
- The system demonstrates a practical solution for self-powered wireless sensing applications.