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Position and Angular Misalignment Analysis for Implantable Wireless Power Transfer System Based on Magnetic Resonance

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Abstract

As a widely-acknowledged truth, the interval of human tissue, the breathing activity, and the body motion work together to change the relative position of the antenna. This knowledge, with detailed examination, is going to bring significant change to the transmission efficiency in the implementation of human wireless power transfer. This paper focused on the relationship of the transfer efficiency with lateral distance, vertical distance and angular (around the center and along the edge) misalignment. A new formula, which serves to connect the geometrical parameters both with the self-resonance frequency and with the Q-factor of the printed circuit board antenna, was given. Furthermore, the paper gave a significant analysis of the efficiency with lateral distance change, vertical distance change and two kinds of angular misalignments using finite element method. The experimental results showed that in the situation of vertical distance change and angular (along the edge) misalignment, the transmission efficiency drops rapidly with the displacement of antenna. However, in the situation of lateral distance change and angular (along the edge) misalignment, there were a high-efficiency distance—the lateral misalignment ≤40% of the length of the width in the lateral misalignment; and a high-efficiency angle—angular around the center misalignment ≤30º in the angular misalignment. Within the ranges, a high-efficiency space (HES) is formed in the implantable WPT system utility, and the transmission efficiency drops rapidly when the antenna is beyond the HES. This paper can provide a practical application to the antenna design and specific implementation in human implantable WPT system.

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Acknowledgement

This paper is supported by the National International Cooperation Projects “Joint Research and Development of Magnetic Resonance Wireless Energy Transfer System for Implantable Electronic Devices” (2013DFA10490) and Qingdao Innovation and Entrepreneurship Leading Project (13-cx-2).

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Authors and Affiliations

  1. School of Information Science and Engineering, Ocean University of China, Qingdao, 266100, China

    Fei-Xiang Gong, Zhiqiang Wei, Haokun Chi, Bo Yin & Yanping Cong

  2. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, 15213, USA

    Fei-Xiang Gong, Ying Sun & Mingui Sun

  3. School of Electrical Engineering, Hebei University of Technology, Tianjin, 300401, China

    Ying Sun

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  1. Fei-Xiang Gong
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  2. Zhiqiang Wei
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  4. Bo Yin
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  7. Mingui Sun
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Correspondence to Fei-Xiang Gong.

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Gong, FX., Wei, Z., Chi, H. et al. Position and Angular Misalignment Analysis for Implantable Wireless Power Transfer System Based on Magnetic Resonance. J. Med. Biol. Eng. 37, 602–611 (2017). https://doi.org/10.1007/s40846-017-0277-6

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  • DOI: https://doi.org/10.1007/s40846-017-0277-6

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