Title :
Suppression of bulk-wave responses in SAW devices using the difference of power flow angles
Author_Institution :
Fac. of Eng., Tohoku Univ., Sendai, Japan
Abstract :
If spurious bulk-waves are radiated from the launching interdigital transducers (IDT´s) in surface acoustic wave (SAW) devices, it is possible to reduce bulk-wave responses by steering the beams out of the receiving IDT by use of the difference of power flow angles (PFA´s) between SAWs and bulk-waves. The spurious bulk wave suppression scheme is clarified. A new crystal cut with excellently suppressed bulk-wave responses using this scheme is located for quartz.<>
Keywords :
interdigital transducers; surface acoustic wave devices; SAW devices; SiO/sub 2/; beam steering; bulk wave suppression; interdigital transducers; power flow angles; quartz crystal; Acoustic beams; Acoustic propagation; Acoustic transducers; Acoustic waves; Delay; Geometry; Load flow; Surface acoustic wave devices; Surface acoustic waves; Temperature;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
