Title :
Superhigh electromechanical coupling for acoustic plate waves in potassium niobate
Author :
Zaitsev, B.D. ; Kuznetsova, I.E. ; Joshi, S.G. ; Borodina, Irina A.
Author_Institution :
Dept. of Electr., Electron., & Comput. Eng., Marquette Univ., Milwaukee, WI, USA
Abstract :
The characteristics of acoustic waves propagating in thin plates of single crystal potassium niobate are theoretically investigated. It is found that acoustic plate waves can provide extremely high values of electromechanical coupling. For example, values of Δv/v, the fractional velocity change produced by electrical shorting of the surface, as high as 0.5 can be obtained with the shear horizontal (SH0) wave. The influence of a thin conducting layer on the velocity and attenuation of plate waves is investigated. It is shown that variations in these parameters as high as 50% and 30 dB per wavelength can be achieved for change in layer sheet conductance from 10-7 to 10-5 S.
Keywords :
acoustic wave propagation; acoustic wave velocity; potassium compounds; surface acoustic waves; KNbO3; acoustic plate waves; electrical shorting; electromechanical coupling; fractional velocity change; shear horizontal wave; single crystal; thin plates; wave attenuation; wave velocity; Acoustic propagation; Acoustic waves; Attenuation; Conducting materials; Niobium compounds; Optical materials; Optical surface waves; Sawing machines; Surface acoustic waves; Surface waves;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849404
