Patent ID: 11881608
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A filter device comprising:
a surface acoustic wave filter including a plurality of surface acoustic wave resonators; wherein
at least one of the plurality of surface acoustic wave resonators includes a plurality of divided resonators connected in parallel with each other;
each of the plurality of divided resonators includes an interdigital transducer, and among the plurality of divided resonators, a pitch of the interdigital transducer of a divided resonator is different from a pitch of the interdigital transducer of another divided resonator;
(Pmax−Pmin)/Pa is about 0.7% or smaller, where Pa is an average of the pitches of the interdigital transducers of the plurality of divided resonators, and Pmax and Pmin are a maximum value and a minimum value, respectively, of the pitches of the interdigital transducers of the plurality of divided resonators; and
the interdigital transducers of the plurality of divided resonators are displaced from each other in a direction that is parallel or substantially parallel to an arrangement direction of electrode fingers of at least one of the plurality of divided resonators and in a direction perpendicular or substantially perpendicular to the arrangement direction of the electrode fingers.