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Scalable, Dual-Band Metasurface Array for Electromagnetic Energy Harvesting and Wireless Power Transfer.

Yiqing Wei1,2, Junping Duan1,2, Huihui Jing1,2

  • 1School of Instrument and Electronics, North University of China, Taiyuan 030051, China.

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Summary
This summary is machine-generated.

This study introduces a dual-band metasurface array for efficient electromagnetic energy harvesting. The developed system achieves high RF-to-dc conversion efficiencies for Wi-Fi and Ku bands.

Keywords:
ambient energy harvesting (AEH)dual-band rectennametasurface array absorberrectifierwireless power transfer (WPT)

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Area of Science:

  • Electromagnetics
  • Metamaterials
  • Energy Harvesting

Background:

  • Electromagnetic (EM) energy harvesting is crucial for powering wireless devices.
  • Metasurfaces offer novel solutions for manipulating EM waves.
  • Dual-band harvesting addresses the need for utilizing diverse frequency sources like Wi-Fi and Ku bands.

Purpose of the Study:

  • To design and demonstrate a dual-band metasurface array for simultaneous EM energy harvesting.
  • To integrate rectifiers for efficient conversion of harvested RF energy to DC power.
  • To evaluate the performance of the fabricated prototype at Wi-Fi and Ku band frequencies.

Main Methods:

  • A dual-band metasurface array composed of unit cells, rectifiers, and load resistors was designed.
  • Metasurface units were interconnected to create two energy delivery channels.
  • A single series diode rectifier and a voltage doubler rectifier were integrated for Wi-Fi and Ku band rectification, respectively.
  • A 7x7 prototype was fabricated and tested in an anechoic chamber.

Main Results:

  • The metasurface array successfully harvested energy in both the Wi-Fi (2.4 GHz) and Ku bands (12.6 GHz).
  • Measured RF-to-dc efficiencies reached 64% at 2.4 GHz (3 dBm incident power) and 55% at 12.6 GHz (14 dBm incident power).
  • The interconnected design facilitated efficient transmission and aggregation of incident power.

Conclusions:

  • The proposed dual-band metasurface array is effective for electromagnetic energy harvesting.
  • The integrated rectifiers demonstrate high efficiency for Wi-Fi and Ku band frequencies.
  • This technology shows promise for powering low-power electronic devices using ambient RF energy.