| 摘要 |
<p>A boundary acoustic wave device using an SH type boundary acoustic wave is provided which has a large electromechanical coefficient, small propagation loss and power flow angle, a temperature coefficient of frequency TCF in an appropriate range, and a simple structure which can be manufactured by a simple method. A dielectric substance primarily composed of SiO2 is laminated on one surface of a piezoelectric substance primarily composed of LiNbO3, an IDT and reflectors used as electrodes are disposed at the boundary between the piezoelectric substance and dielectric substance, and the density ρ of the electrodes, the thickness H of the electrodes and the wavelength λ of the boundary acoustic wave satisfy the relationship: H>8,261.744ρ-1376.
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