Patent ID: 6815868
Filing Date: 2004-11-09
Classification: H03H

Abstract:
A surface acoustic wave apparatus comprising:a piezoelectric substrate; at least one surface acoustic wave filter including at least a first interdigital transducer and second and third interdigital transducers on opposing sides of the first interdigital transducer, each of the first, second, and third interdigital transducers have electrode fingers, and the first, second and third interdigital transducers are arranged on the piezoelectric substrate in a direction in which a surface acoustic wave propagates; and an input signal terminal and an output signal terminal for said at least one surface acoustic wave filter; wherein at least one of said input signal terminal and said output signal terminal is connected to a balanced signal terminal; and weighting applied to the second interdigital transducer is different from weighting applied to the third interdigital transducer.