Title :
Analysis of leaky surface acoustic waves on LiTaO3 substrate
Author :
Meier, H. ; Russer, P.
Author_Institution :
Tech. Univ., Munchen, Germany
Abstract :
Leaky surface acoustic waves (LSAWs) propagating in arbitrary directions of rotated Y-cuts on LiTaO3 substrates are investigated. The inherent physical behavior of LSAWs, consisting of coupled modes involving terms decaying into the substrate and a term representing a radiating bulk wave, is fully explained. To further reduce the insertion loss, all relevant effects influencing the device performance, e.g., diffraction spreading losses and spurious bulk waves, must be considered. The Y-rotated LiTaO3 substrate with wave propagation in the crystalline X-direction is analyzed. Phase velocity and attenuation constant are computed for different rotation angles, as well as for different propagation directions, and the measured results are compared with those obtained from theoretical analysis
Keywords :
ferroelectric materials; lithium compounds; surface acoustic wave devices; surface acoustic waves; ultrasonic absorption; ultrasonic velocity; LiTaO3 substrate; arbitrary directions; attenuation constant; coupled modes; crystalline X-direction; diffraction spreading losses; leaky surface acoustic waves; phase velocity; radiating bulk wave; rotated Y-cuts; spurious bulk waves; Acoustic propagation; Acoustic waves; Attenuation measurement; Crystallization; Diffraction; Insertion loss; Performance loss; Rotation measurement; Surface acoustic waves; Velocity measurement;
Conference_Titel :
Frequency Control Symposium, 1992. 46th., Proceedings of the 1992 IEEE
Conference_Location :
Hershey, PA
Print_ISBN :
0-7803-0476-4
DOI :
10.1109/FREQ.1992.269990
