2020 Fiscal Year Final Research Report
Establishment of a completely passive channel estimation method with zero power consumption at receivers for microwave wireless power transmission
| Project/Area Number |
19K23506
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0302:Electrical and electronic engineering and related fields
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| Research Institution | Iwate University |
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Principal Investigator |
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| Project Period (FY) |
2019-08-30 – 2021-03-31
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| Keywords | 無線電力伝送 / マイクロ波 / レクテナ / 整流器 / 伝搬路推定 / 負荷変調 / 自己干渉除去 / フェーズドアレーアンテナ |
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| Outline of Final Research Achievements |
In microwave power transfer, if a power receiver runs out of battery, a power transmitter cannot grasp the microwave propagation channel to the power receiver, and thus fails to power the receiver.
Therefore, we propose a novel channel estimation technique utilizing the characteristics of the rectifier integrated in the power receiver to convert the microwave into direct current. For example, when the intensity of the microwave emitted from the power transmitter is varied, only the stronger incident wave can pass through the rectifier, but the weaker one cannot pass and is reflected. As a result, the power receiver behaves as if it transmits an ON/OFF modulated signal in spite of no signal source, and the power transmitter can estimate the channel by detecting this pseudo modulated signal.
The experiment result shows that the channel to the power receiver within 3 m can be estimated with high accuracy of more than 80% by the proposed method.
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| Free Research Field |
無線通信工学
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| Academic Significance and Societal Importance of the Research Achievements |
無線電力伝送システムの運用上，電池切れや通信機能を持たない受電機は不可避的に存在し得る．しかし，このような受電機の位置をカメラ等の光学的な手段を用いずに探知することは極めて困難であり，特に受電機までの電波の伝搬経路を推定する技術はこれまでに世界的にも報告されていない．
したがって，受電機側に伝搬路推定のための特別なハードウェアや能動的な処理を必要とせず，メートルオーダで伝搬路を高精度に推定可能とする提案技術は，電池切れ端末への高効率給電を実現するものであり，マイクロ波無線電力伝送の実用化の上で有用な技術である．
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