Title :
A SAW planar piezoelectric convolver
Author :
Defranould, Philippe ; Maerfeld, Charles
Author_Institution :
ASM Division of Thomson-C.S.F., Cagnes-sur-Mer, France
fDate :
5/1/1976 12:00:00 AM
Abstract :
An increase of the dynamic range of a surface-wave piezo-electric convolver can be obtained by increasing its bilinear factor. We show that this can be done by reducing the acoustic beamwidth in the interaction region. A lower limit of beamwidth is found through the study of the guided modes in the convolver plate. A 600-BT product device using nonsymmetrical couplers to obtain the beamwidth reduction is described. The main characteristics-bandwidth, dynamic range, spurious signals-are given and we show a linear FM pulse autocorrelation performed in this device.
Keywords :
Acoustic devices; Acoustic waves; Convolvers; Couplers; Dynamic range; Frequency modulation; Impedance; Nonlinear acoustics; Surface acoustic waves; Voltage;
Journal_Title :
Proceedings of the IEEE
DOI :
10.1109/PROC.1976.10203
