Patent ID: 6075426
Filing Date: 2000-06-13
Classification: H03H

Abstract:
A surface acoustic wave device comprising:a piezoelectric substrate; anda plurality of interdigital transducers sending and receiving surface acoustic waves mounted on a surface of the piezoelectric substrate, whereinat least one of the interdigital transducers is composed of a positive electrode including a plurality of positive split electrodes and a negative electrode including a plurality of negative split electrodes, the positive and negative split electrodes being arranged alternately, each of the positive and negative split electrodes having a pair of electrode fingers,two electrode fingers of each of the positive and negative split electrodes are different in width in a direction in which a surface acoustic wave is excited,an angle .alpha. determined by a direction transverse to the electrode fingers from one of the two electrode fingers having a smaller width toward the other one of the two electrode fingers having a larger width and a direction in which the surface acoustic wave excited by the interdigital transducer including the split electrodes travels to one of the interdigital transducers for receiving the surface acoustic wave is equal to or larger than 0.degree. and smaller than 90.degree. andthe piezoelectric substrate is a substrate of rotated Y-X:quartz.