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Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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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.

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Summary

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.

Keywords:
RFID sensor tagautonomous wireless sensor nodesrectennawireless power transfer

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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.