| 摘要 |
A surface acoustic wave device having interdigital type electrodes on the surface of a substrate composed of a single crystal of langasite belonging to a point group (32). The substrate is given a small absolute value of SAW speed temperature coefficient TCV, a large electromechanical coupling coefficient k<2>, and a slow SAW speed by optimizing the combination of the cutting angle of the substrate from the single crystal and the surface acoustic wave propagating direction. Therefore, the temperature stability of the device can be improved and the passing bandwidth of the device as a filter can be widened. In addition, the size of the device can be reduced and, especially, excellent characteristics as the surface acoustic wave film for intermediate frequencies of mobile communication terminal equipment can be obtained.
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