Title :
Super high electromechanical coupling and zero-temperature coefficient surface acoustic wave substrates in KNbO3 single crystal
Author :
Yamanouchi, Kazuhiko ; Odagawa, Hiroyuki ; Kojima, Toshiyuki ; Matsumura, Takeshi
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
The propagation characteristics of surface acoustic waves (SAW) and piezoelectric leaky surface waves in KNbO3 single crystal were investigated theoretically and experimentally. The results show that the electromechanical coupling coefficient of the surface wave propagating along the X-axis of the rotated Y-cut plane is very large, K 2=0.53, compared to K2 of 0.055 for LiNbO3 . Also the KNbO3 substrates show the zero temperature coefficients of frequency (TCF) around 20°C
Keywords :
acoustic materials; piezoelectric materials; potassium compounds; surface acoustic wave devices; 20 degC; KNbO3; SAW devices; X-axis; electromechanical coupling; piezoelectric leaky surface waves; propagation characteristics; rotated Y-cut plane; zero-temperature coefficient SAW substrates; Acoustic propagation; Acoustic waves; Conducting materials; Electric potential; Maxwell equations; Metallization; Optical surface waves; Surface acoustic wave devices; Surface acoustic waves; Surface waves;
Conference_Titel :
Frequency Control Symposium, 1997., Proceedings of the 1997 IEEE International
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-3728-X
DOI :
10.1109/FREQ.1997.638698
