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 KNbO3 is 15 dB higher than of the convolver using Y-Z LiNbO3.
|Number of pages||4|
|Journal||Proceedings of the IEEE Ultrasonics Symposium|
|Publication status||Published - 1997 Dec 1|
|Event||Proceedings of the 1997 IEEE Ultrasonics Symposium. Part 1 (of 2) - Toronto, Can|
Duration: 1997 Oct 5 → 1997 Oct 8
ASJC Scopus subject areas
- Acoustics and Ultrasonics