Please use this identifier to cite or link to this item: https://doi.org/10.1109/TMTT.2019.2901674
Title: Wireless Power Transfer Antenna Alignment Using Intermodulation for Two-Tone Powered Implantable Medical Devices
Authors: Zhang, Hao
GAO SIPING 
NGO TUNG 
Wu, Wen
GUO YONGXIN 
Keywords: Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Antenna alignment
implantable medical devices (IMDs)
intermodulation
two-tone (2T) waveform excitation
wireless power transfer (WPT)
DESIGN
RECTENNA
Issue Date: 1-May-2019
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation: Zhang, Hao, GAO SIPING, NGO TUNG, Wu, Wen, GUO YONGXIN (2019-05-01). Wireless Power Transfer Antenna Alignment Using Intermodulation for Two-Tone Powered Implantable Medical Devices 67 (5) : 1708-1716. ScholarBank@NUS Repository. https://doi.org/10.1109/TMTT.2019.2901674
Abstract: © 1963-2012 IEEE. Wireless power transfer (WPT) to the implantable medical devices (IMDs) often suffers from antenna radiation direction and polarization misalignments, which degrades the wireless power link efficiency. Although increasing the incident power density is able to solve the power hunger of IMDs, it poses safety issues to the human tissue. In this paper, an antenna alignment method using intermodulation is proposed to address WPT antenna misalignment in a safe way. Two-Tone (2T) waveform excitation is employed to enhance the rectification as well as to generate intermodulation. The intermodulation power is fed back via a magnetic resonant coupling link. Due to the monotonic relation between the intermodulation power and the degree of antenna misalignments, the receiving antenna (in body) can be aligned with the transmitting one (out body). Such a scheme has the advantages of less harm to human tissue and less interference between the 2T waveform excitation and the magnetic resonant coupling link. The whole system is theoretically analyzed and experimentally validated.
URI: https://scholarbank.nus.edu.sg/handle/10635/156945
ISSN: 0018-9480
1557-9670
DOI: 10.1109/TMTT.2019.2901674
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