Title :
20 dB efficiency increment of surface acoustic wave elastic convolver using actively controlled nonlinear piezoelectric effect
Author :
Cho, Y. ; Haitsuka, S. ; Kadota, M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Yamaguchi Univ., Ube, Japan
Abstract :
The newly discovered effect concerning the enhancement of the nonlinear piezoelectricity of lead zirconate titanate (PZT) ceramics by applying a bias electric field to the substrate has enabled more than 20 dB efficiency enlargement in a surface acoustic wave (SAW) elastic convolver. Next, the new novel biasing method for stabilizing the time variation of convolution output signal with static field and for obtaining more efficient convolver is proposed. Finally, the temperature characteristic of PZT convolver is also investigated. These results suggest the possibility of producing a SAW elastic convolver with higher efficiency than that of a SAW monolithic convolver.<>
Keywords :
acoustic signal processing; ceramics; lead compounds; piezoelectric materials; surface acoustic wave devices; surface acoustic waves; PZT; PbZrO3TiO3; actively controlled nonlinear piezoelectric effect; bias electric field; convolution output signal; lead zirconate titanate ceramics; static field; surface acoustic wave elastic convolver; temperature characteristic; time variation; Acoustic waves; Ceramics; Convolution; Convolvers; Piezoelectricity; Surface acoustic waves; Temperature; Titanium compounds;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335565
