| 摘要 |
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 is laminated on one surface of a piezoelectric substance, an IDT and reflectors used as electrodes are disposed at a boundary between the piezoelectric substance and the dielectric substance, and the thicknesses of the electrodes are determined so that the acoustic velocity of the SH type boundary acoustic wave is low as compared to that of a slow transverse wave propagating in the dielectric substance and to that of a slow transverse wave propagating in the piezoelectric substance, so that a boundary acoustic wave device is formed. <IMAGE>
|
