2023 Fiscal Year Annual Research Report
Metamaterial-based Compact and Efficient Wireless Power Transfer System for Biomedical Implants
| Project/Area Number |
21K04178
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| Research Institution | Kyushu University |
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Principal Investigator |
Pokharel R.K. 九州大学, システム情報科学研究院, 教授 (60398568)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | metamaterial / absorber / wireless power transfer / data rate / phantom |
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| Outline of Annual Research Achievements |
In this three-year project, we have proposed a novel structure for a compact wireless power transfer (WPT) system and a novel metamaterial that can enhance the efficiency of power transfer through human tissue. By utilizing a receiver size of 7mm x 7mm, we were able to achieve an AC to DC efficiency of over 35%.
In FY 2023, a metamaterial-inspired absorber was developed to enhance isolation in a simultaneous wireless information and power transfer (SWIPT) system through biological tissues. The study focused on the characteristics of split-ring resonators (SRRs) within the proposed absorber unit cells. The absorber exhibits a significant real part near -1 and an imaginary part close to 0 in permeability. Experimental results conducted in phantom sheets using the proposed SWIPT system, with and without the proposed metamaterial-based absorber embedded between power and signal ports, led to a 3 dB improvement in isolation performance. Additionally, with the absorber, the data rate improved by more than 1 Mb/sec compared to the original system.
In conclusion, the WPT system and SWIPT system developed in this project will be used to wirelessly charge medical implants such as pacemakers and artificial hearts. This innovation has the potential to revolutionize the healthcare industry by providing comfort and potentially saving lives for many patients who require such implants.
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