Patent ID: 6246150
Filing Date: 2001-06-12
Classification: H03H

Abstract:
A surface acoustic wave device comprising:a piezoelectric substrate;a first common electrode formed on the piezoelectric substrate;a first comb-like electrode finger arrangement including a plurality of first electrode finger groups connected with the first common electrode, said first electrode finger groups comprising one first finger group having a plurality of first electrode fingers having a plurality of different distributed first positive finger width deviations that have different values greater than a value of .lambda./8 and a plurality of different distributed negative first finger width deviations that have different values less than a value of .lambda./8, wherein .lambda. is surface acoustic wavelength;a second common electrode provided in parallel to the first common electrode on the piezoelectric substrate; anda second comb-like electrode finger arrangement including a plurality of second electrode finger groups connected with the second common electrode, said second electrode finger groups comprising one second finger group having a plurality of second electrode fingers having a plurality of different distributed second positive finger width deviations that have different values greater than a value of .lambda./8 and a plurality of different distributed negative second finger width deviations that have different values less than the value of .lambda./8, wherein said second electrode finger groups are interdigitaly overlapped with said first electrode finger groups.