Propagation characteristics of surface acoustic waves on langasite

Kenji Inoue, Katsuo Sato

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43 Citations (Scopus)


The propagation characteristics of surface acoustic waves (SAW) on La3Ga5SiO14 were investigated by both experimental and numerical methods. The experimental results of the SAW velocity and the coupling coefficient (k2) on X-cut and K-cut substrates were in good agreement with the numerical results using the material constants reported previously. However, the experimental results of the temperature coefficient of delay (TCD) differed from that of the numerical calculations. So, a modification of the temperature coefficients of the material constants was performed numerically by the measured data using the direct search of optimization method. The numerical results obtained using the new constants were in good agreement with the experiment result on the X-cut and Y-cut substrates. Other cuts were also studied using the new constants. Then it was confirmed theoretically and experimentally that the temperature stable cut was located at (0°, 140°, 22.5°) cut with k2 of 0.32% and TCD (second-order coefficient) of 5.2 × 10-8/°C2.

Original languageEnglish
Pages (from-to)2909-2913
Number of pages5
JournalJapanese Journal of Applied Physics
Issue number5 SUPPL. B
Publication statusPublished - 1998 May


  • Langasite
  • Surface acoustic wave
  • Temperature coefficient
  • Temperature stability


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