2022 Fiscal Year Research-status 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 | 小型化WPTシステム / メタマテリアル / 低磁性損失 |
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| Outline of Annual Research Achievements |
In FY 2022, design methodlogy of low magnetic loss metamaterial was proposed and employed to design a compact and high-efficiency wireless power transfer system. later, a new type of wideband metamaterial was also proposed for a robust and compact dual-band wireless power transfer (WPT) system. A dual-band WPT system is necessary to transmit power and information together. The proposed metamaterial employs the split ring resonator (SRR) unit cells loaded by non-uniform capacitors. First, two types of unit cells that exhibit two resonance frequencies were analyzed. The analytical results show it can only improve the coupling between the transmitter (Tx) and the receiver (Rx) at the single band only. Then each unit cell was sandwiched with each other, and a hybrid unit cell that indicated three resonance frequencies was finally proposed. The hybrid SRR exhibits near-zero permeability within the wide frequency range of interest. Therefore, the proposed metamaterial was effective at both bands simultaneously. The system was fabricated and tested, including a compact dual-band WPT system. The size of the Tx (Rx) and the metamaterial are 15 × 15 mm2 and 20 × 20 mm2 , respectively. The measured figure of merits (FOMs) are 0.92 and 0.85 at 770 MHz at both bands, respectively, at a power transfer distance of 20 mm, which is a significant improvement over recently proposed dual-band WPT systems with metamaterials.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The initially proposed idea which was supported by electromagnetic simulation and circuit simulation, worked perfectly. We were also able to fabricate the device on time which worked in a single try. So, it saves a lot of time also. This success will be achieved by our long experience on the co-simulation of large-scare of circuits that contains active and passive circuits.
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| Strategy for Future Research Activity |
In FY 2023, we will improve our metamaterial and WPT system model and improve the WPT system's performance. This year, again we will also on the design of the rectifier circuit and will integrate it with the WPT system. The rectifier is necessary to convert the radio frequency signals to direct current.
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| Causes of Carryover |
昨年度は、コロナの影響が続き、デバイスの評価が遅れたため。
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