2022 Fiscal Year Annual Research Report
メタマテリアルとリアクティブ反射板を利用した高効率WPTシステム
| Project/Area Number |
21F51046
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| Allocation Type | Single-year Grants |
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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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| Co-Investigator(Kenkyū-buntansha) |
ALI MOHAMED 九州大学, システム情報科学研究科(研究院, 外国人特別研究員
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| Project Period (FY) |
2021-11-18 – 2024-03-31
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| Keywords | Metamaterial / WPT / High Impedance Substrate |
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| Outline of Annual Research Achievements |
In FY2022, a new cascaded structure was proposed to improve the coupled KQ product (where K represents the coupling coefficient and Q represents the unloaded quality factor) and boost the power transfer efficiency (PTE) of the wireless power transfer (WPT) system. The structure consists of four small resonators that are cascaded together and fed with a single excitation, with each resonator consisting of two concentric rectangular rings. This cascaded structure is capable of achieving a maximum PTE of 89.5% at a transfer distance of 20 mm.
Subsequently, a passive relay system made of stacked metamaterial lenses is used to extend the power transfer distance and address misalignment issues. With the proposed WPT system, the transfer distance is increased to 80 mm with a PTE of 50%. This integration with metamaterials achieves a 300% improvement in the transfer distance with a reasonable PTE compared to the cascaded structure alone. An assembly of two stacked metamaterials is then utilized to further extend the transfer distance, providing an additional 200% enhancement without affecting PTE.
A thorough study of misalignment was conducted, demonstrating that the proposed system is capable of transferring power independently of the position of the receiver with a reasonable PTE. To the best of our knowledge, the proposed structure is the first to employ multiple cascaded resonators integrated with stacked metamaterials for WPT applications.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Everything went very well and we also achieved the experimental results as expected. This might be due to our long background on electromagnetic
theory and its accurate simulation techniques we have expertise so far.
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| Strategy for Future Research Activity |
In this year, we plan to improve the design of HIS (High-impedance substrate) and employ it to further improve the performance of the prosed WPT system.
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