Research of Super-High Electromechanical Coupling Surface Acoustic Wave Substrates

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概要

• 論文の詳細を見る

• The properties of surface acoustic wave (SAW) devices mainly depend on the choice of piezoelectric substrate materials. The important properties required for SAW substrates are a large electromechanical coupling coefficient ($k^{2}$), small temperature coefficient of delay (TCD), and low propagation loss, etc. Especially, super-high coupling substrates are very important for obtaining wide-band SAW filters, wide-band voltage controll oscilater (VCO) and delay lines with small insertion loss. KNbO3 single crystal has an extremely large electromechanical coupling coefficient ($k^{2}=53$%) and zero TCD at approximately room temperature. Large-scale single-crystal growth technologies are now under investigation. In this study, the propagation characteristics of SAW in PZNT and KTP substrates are investigated experimentally in order to obtain higher coupling substrates than those of KNbO3. The experimental results show that the substrates have large $k^{2}$. Also, theoretical SAW propagation characteristics with a $k^{2}$ of about 100% are analyzed and their physical phenomena are discussed.

• Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
• 2001-05-30

著者

• YAMANOUCHI Kazuhiko

  Tohoku Institute of Technology

• Odagawa Hiroyuki

  Research Institute Of Electrical Communication Tohoko University

• Odagawa Hiroyuki

  Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan

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