Title :
High efficiency elastic convolver using KNbO3 substrate
Author :
Yamanouchi, K. ; Odagawa, H. ; Morozumi, K. ; Cho, Y.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
Elastic convolvers are very important for signal processing devices of the spread spectrum communication (SSC) systems. The better efficient convolvers are required for the application for the spread spectrum and next stage communication systems. A high value of coupling coefficient is very important for wideband and high efficiency SAW devices such as SAW convolvers. Potassium niobate (KNbO3) has large piezoelectric constants and very large electromechanical coupling coefficient (K2) of 0.53 for the surface acoustic waves which is about 10 times larger than that of LiNbO3. Therefore the high efficient elastic SAW convolvers using KNbO3 substrates are expected. In this paper, the rotated 60° Y-cut, X-propagating KNbO3 substrates are used for a convolver. The experimental results show that the efficiency of the convolver using 60 °Y-X KNbO 3 is 15 dB higher than of he convolver using Y-Z LiNbO3
Keywords :
potassium compounds; surface acoustic wave convolution; KNbO3; KNbO3 substrate; SAW convolver; efficiency; elastic convolver; electromechanical coupling coefficient; next stage communication system; piezoelectric constant; signal processing device; spread spectrum communication system; surface acoustic wave device; Acoustic waves; Convolvers; Electrodes; Niobium compounds; Nonlinear optics; Optical surface waves; Substrates; Surface acoustic wave devices; Surface acoustic waves; Wideband;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.663034
