Patent ID: 7414494
Filing Date: 2008-08-19
Classification: H03H

Abstract:
1. A surface acoustic wave apparatus including a signal input terminal, a signal output terminal, a first series interdigital transducer, a second series interdigital transducer, and a branch interdigital transducer, the first and second interdigital transducers being connected in series between the signal input terminal and the signal output terminal, and the branch interdigital transducer being disposed on a transmission path which branches from a transmission path between the signal input terminal and the signal output terminal to a reference potential, wherein: a phase rotating element is connected in parallel with said first series interdigital transducer, said first series interdigital transducer is acoustically coupled with said second series interdigital transducer, said first series interdigital transducer has a closer electrode finger pitch to an electrode finger pitch of said second series interdigital transducer than an electrode finger pitch of said branch interdigital transducer.