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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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Fabricating Metamaterials Using the Fiber Drawing Method
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Wireless power transfer system with enhanced efficiency by using frequency reconfigurable metamaterial.

Dongyong Shan1, Haiyue Wang2, Ke Cao1

  • 1Postdoctoral Research Station of Clinical Medicine and Department of Oncology Radiotherapy Center, The 3Rd Xiangya Hospital, Central South University, Changsha, 410000, China.

Scientific Reports
|January 11, 2022
PubMed
Summary

This study introduces a frequency reconfigurable magnetic resonant coupling wireless power transfer system using metamaterials to boost efficiency. The metamaterial enhances magnetic fields, significantly improving power transfer efficiency (PTE) in wireless power transfer applications.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Electromagnetics

Background:

  • Wireless power transfer (WPT) systems are increasingly vital in diverse applications, including consumer electronics, electric vehicles, and sensors.
  • Existing WPT systems face challenges in efficiency and adaptability across different operating frequencies.
  • Metamaterials offer unique electromagnetic properties that can be leveraged to enhance WPT performance.

Purpose of the Study:

  • To propose and investigate a novel frequency reconfigurable magnetic resonant coupling wireless power transfer (MRCWPT) system.
  • To enhance the efficiency of MRCWPT systems by integrating a frequency reconfigurable metamaterial.
  • To demonstrate dynamic efficiency enhancement through adjustable capacitance and metamaterial manipulation of electromagnetic fields.

Main Methods:

  • Design and simulation of an ultra-thin frequency reconfigurable metamaterial capable of manipulating electromagnetic fields.
  • Integration of the metamaterial into an MRCWPT system, with reconfigurability achieved via adjustable capacitor.
  • Analysis using finite element simulations and equivalent circuit theory to understand the reconfigurable mechanism and field manipulation.
  • Experimental verification of simulation results through system measurements.

Main Results:

  • The frequency reconfigurable metamaterial demonstrated abnormal effective permeability, enabling control over electromagnetic field direction.
  • The integrated metamaterial enhanced power transfer efficiency (PTE) across a range of frequencies (14.1 MHz to 25 MHz).
  • At 15 MHz and 120 mm distance, PTE increased from 49% without metamaterial to 72% with the metamaterial.
  • Measured PTE values with the metamaterial ranged from 58% to 73% across the tested frequencies.

Conclusions:

  • The proposed frequency reconfigurable metamaterial effectively enhances the magnetic field and PTE in MRCWPT systems.
  • The system's reconfigurability, achieved through adjustable capacitance and metamaterial properties, allows for dynamic efficiency improvements.
  • The findings validate the potential of metamaterials for advancing wireless power transfer technology.