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

2021 Fiscal Year Annual Research Report

• Project/Area Number: 21F51046
• Allocation Type: Single-year Grants
• Research Institution: Kyushu University
• Principal Investigator: Pokharel R.K. 九州大学, システム情報科学研究院, 教授 (60398568)
• 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
• Project Period (FY): 2021-11-18 – 2024-03-31
• Keywords: Metamaterial / WPT / High Impedance Substrate

Outline of Annual Research Achievements

In FY 2021, we have carried out the survey research that has been going on all over the world and proposed two types of resonators which may produce high KQ product in tissue environment. Furthermore, unlikely for a far-field wireless power transfer (WPT) system, designing a metasurface is critical for a near-field WPT system. First, a robust near-field WPT system using open-loop spiral resonators and a metasurface were designed, and then, the effectiveness of the metasurface is investigated in improving the power transfer efficiency (PTE) and misalignment effects. Furthermore, a study of planar and angular misalignments was also executed to prove the WPT system immunity. The proposed WPT system offers a PTE of 30% when the Rx shifts by the lateral length of the Rx that means the Rx does not remain in front of the Tx. Moreover, the efficiency is almost unchanged due to the angular misalignment. We tested this system only in Air.

Current Status of Research Progress

1: Research has progressed 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 achieved so far.

Strategy for Future Research Activity

In the remaining time, we plan to improve the design of HIS (high-impedance substrate) and will use to further improve the performance of the proposed WPT system. The developed system will be tested in tissue medium.