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The propagation characteristics, mainly the propagation loss and bulk wave radiation loss, of a pure shear-horizontal-type surface acoustic wave on (0°, θ, 90°)-cut langasite with a high-density thin film such as a gold (Au) film or a tantalum pentoxide (Ta2O5) dielectric film were investigated experimentally. The cut angles θ of 0°, 10° and 20° were chosen because a coupling factor of 1.0% and a zero temperature coefficient of delay (TCD) can both be expected at approximately these cut angles. For the Au film, the propagation loss and bulk wave radiation loss were small at θ=10°.
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Kakio et al. (2005) studied this question.
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