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\begin{document}

\title{Wireless power transfer efficiency enhancement based on negative
permeability double helix metamaterial structure}



\author[1]{Xin Huang}%
\author[1]{Zifan Hou}%
\author[1]{Dachao Chen}%
\author[1]{Rui Li}%
\author[1]{Mengjie Shou}%
\author[1]{Decheng Wu}%
\author[1]{Ping-an Yang}%
\author[1]{Hongping Luo}%
\affil[1]{Chongqing University of Posts and Telecommunications School of Automation}%


\vspace{-1em}



  
  \date{May 27, 2024}


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\begin{abstract}
The long transmission distance in wireless power transmission(WPT)
system will lead to a sharp decline in transmission efficiency, this
paper presents a novel ortho-octagonal double helix metamaterial that
can effectively enhance the transmission efficiency of WPT systems,
theoretically derived and experimentally verified the enhancement of
evanescent wave transmission by this metamaterial dielectric plate. A
WPT simulation system operating at 10.78 MHz is constructed by HFSS
software, and the effects of adding passive relay coils and different
shapes of metamaterials on the transmission efficiency are comparatively
investigated. Both simulation and experimental results show that the
transmission efficiency of the WPT system can be improved to different
degrees after inserting different shapes of metamaterials at the
transceiver end of the system. When the transceiver coil spacing of the
WPT system is greater than 22 cm, the effect of metamaterials on the
system transmission efficiency enhancement shows an increasing and then
decreasing trend as the distance increases. The positive octagonal
metamaterial improves 12\% over the circular metamaterial in the
mid-range transmission distance due to its better magnetic coupling
effect. When the transceiver coil spacing is 22 cm, the open-circuit
voltage of the receiving coil after loading the metamaterial is
stabilized to be enhanced by nearly 5 times, and it has the best effect
at 30 cm, and the transmission efficiency is enhanced from 30\% to 60\%,
which verifies the effective enhancement of the metamaterial on the
transmission efficiency of the WPT system.%
\end{abstract}%



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\verb`Manuscript.docx`  available at \url{https://authorea.com/users/754498/articles/724378-wireless-power-transfer-efficiency-enhancement-based-on-negative-permeability-double-helix-metamaterial-structure}

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