Development of low-damping piezoelectric material suitable for acoustic wave devices for next-generation communication 6G

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K18786
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: Tohoku University
• Principal Investigator: Ohashi Yuji 東北大学, 未来科学技術共同研究センター, 特任准教授 (50396462)
• Project Period (FY): 2022-06-30 – 2024-03-31
• Keywords: 伝搬減衰 / 次世代無線通信 / 結晶欠陥

Outline of Final Research Achievements

We have developed a method for measuring propagation attenuation in a single crystal substrate at high frequencies in the GHz band using a configuration in which a transducer substrate is metal bonded to a single crystal substrate. Compared to LN single crystals with a congruent composition, which are thought to contain many crystal defects, Mg-doped Mg:LN single crystals are more effective in reducing crystal defects, and as a result, the propagation attenuation of ultrasonic waves in high frequency bands is reduced. We suggested that this material has the effect of reducing the loss of energy, and developed design guidelines for materials with low attenuation in high frequency bands.

Free Research Field

超音波計測

Academic Significance and Societal Importance of the Research Achievements

次世代通信システム6Gで利用が検討されている6-40 GHz帯対応の弾性波デバイスの開発が急務となっているが、高周波化に伴う材料の粘性に起因する本質的な吸収損失の低減がデバイス実用化の鍵の一つであり、本研究成果はその実現に向けて低減衰の材料開発の指針を与える重要な成果である。