Abstract
The Interdigital Transducers (IDT) used in SAW devices are effective for -ng various acoustic waves (Rayleigh Waves, Surface Skirnmin Bulk Waves and Bulk Acoustic Waves). In the Y-nit quartz, when the propagation is in &e Y-Z plane, only the shear horizontal waves are generated. The direction of emission is scanned by the applied excitation frequency. The IDT is equivalent to an acoustic array antenna launching a collimated beam into the crystal bulk at such an angle that the beam reflected by the crystal plate bottom is redirected to the top surface where it can be intercepted by a receiving IDT. Guided waves are due to successive reflections on the parallel surfaces. If the plate thickness is weak, because of the interference between incident and reflected waves, plate modes are excited. In this paper, theoretical and experimental analysis of guided waves and plate modes are presented.
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