Patent ID: 7646266
Filing Date: 2010-01-12
Classification: H03H

Abstract:
1. A surface acoustic wave resonator, comprising: a piezoelectric substrate having a surface; a plurality of interdigital transducers provided on the surface of the piezoelectric substrate, each interdigital transducer of the plurality of interdigital transducers including a plurality of electrode fingers; and a plurality of reflecting electrodes provided on the surface of the piezoelectric substrate, at least one reflecting electrode of the plurality of reflecting electrodes being disposed at each of two sides of each interdigital transducer of the plurality of interdigital transducers, wherein the plurality of interdigital transducers are connected in parallel, wherein resonance frequencies of a plurality of surface acoustic wave resonators formed by the plurality of interdigital transducers and the plurality of reflecting electrodes are substantially the same, and wherein a number of electrode fingers included in a first interdigital transducer of the plurality of interdigital transducers is different from a number of electrode fingers included in a second interdigital transducer of the plurality of interdigital transducers so as to reduce a peak value of a ripple generated by the first interdigital transducer and the second interdigital transducer.