Elastic wave filter device and duplexer
AssigneeMurata Manufacturing Co., Ltd.
InventorMotoki OZASA
Life of this patent
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Abstract
An elastic wave filter device includes first and second reception filters, an input terminal, output terminals, and reference terminals provided on a piezoelectric substrate. The first reception filter includes series resonators and parallel resonators, and the second reception filter includes series resonators and parallel resonators. The reference terminal connected to the parallel resonator connected so as to be closest to the output terminal among the parallel resonators included in the first reception filter, and the reference terminal connected to the parallel resonator connected so as to be closest to the output terminal among the parallel resonators included in the second reception filter, are separated from each other on the piezoelectric substrate.
Claims20
An elastic wave filter device comprising:
- a first elastic wave filter and a second elastic wave filter having pass bands different from each other and provided on a piezoelectric substrate;
- and
- a shared terminal, a first terminal, a second terminal, and a plurality of reference terminals provided on the piezoelectric substrate;
- wherein
- the first elastic wave filter includes a series resonator connected between the shared terminal and the first terminal and a parallel resonator connected between a connection path from the shared terminal to the first terminal and one reference terminal among the plurality of reference terminals;
- the second elastic wave filter includes parallel resonators connected between a connection path from the shared terminal to the second terminal and another reference terminal among the plurality of reference terminals;
- and
- a first reference terminal connected to a parallel resonator connected so as to be closest to the first terminal among the parallel resonators included in the first elastic wave filter, and a second reference terminal connected to a parallel resonator connected so as to be closest to the second terminal among the parallel resonators included in the second elastic wave filter, are separated from each other on the piezoelectric substrate.
Dependencies are inferred from the claim text.