Research on super-directional antennas for wireless power transmission

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04615
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Yamagata University
• Principal Investigator: Saito Atsushi 山形大学, 大学院理工学研究科, 教授 (70313567)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 超伝導バルク / アンテナ / 無線電力伝送

Outline of Final Research Achievements

We researched a transmission device using a superconducting bulk as a resonator. Numerical targets were set for a frequency of 2 to 6 GHz, an input power of 100 W or more, a transmission distance of 1 m or more, and a received power of 5 W or more (transmission efficiency of 5% or more). During the research period, an anechoic chamber was maintained, and a system capable of wireless power transmission experiments with a maximum input power of 100 W and a maximum transmission distance of 1 m was constructed. Using a single-element superconducting bulk antenna for transmission and a commercially available horn antenna, the distance dependence of the power transmission efficiency was evaluated and achieved a transmission efficiency of 1.485%.

Free Research Field

超伝導エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

今回の研究期間内では、当初の目標をすべて達成することができなかった。この原因は電波暗室内での伝送効率実験のため小型冷凍機を採用したため、冷却能力が不十分であったこと、また、デバイスのアレイ化が実現できず指向性の向上を十分に達成できなっかったことが要因であると考えている。一方で、バルク共振器を用いたアンテナで初めての電力伝送を実現させ、今後デバイス改良を行えば、実用レベルの送受信も可能であるという知見も得ることができた。