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US 2019/0356302 A1Published application
Acoustic wave device, duplexer, and filter device
AssigneeMurata Manufacturing Co., Ltd.
InventorJunpei YASUDA
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Abstract
An acoustic wave device includes an antenna terminal, a signal terminal, and a plurality of resonators that are provided on a piezoelectric substrate. The plurality of resonators include a plurality of series arm resonators on a series arm, and the duty of an IDT electrode of the series arm resonator closest to the antenna terminal among the plurality of series arm resonators is smaller than the duty of an IDT electrode of at least one series arm resonator among the other series arm resonators.
Claims17
An acoustic wave device comprising:
- a piezoelectric substrate;
- an antenna terminal provided on the piezoelectric substrate and electrically connected to an antenna;
- a signal terminal provided on the piezoelectric substrate, to which a signal is input, and from which a signal is output;
- and
- a plurality of resonators provided on the piezoelectric substrate and including an IDT electrode;
- wherein
- the plurality of resonators include a plurality of series arm resonators on a series arm electrically connecting the antenna terminal to the signal terminal;
- and
- a duty of the IDT electrode of a series arm resonator closest to the antenna terminal among the plurality of series arm resonators is smaller than a duty of the IDT electrode of at least one other series arm resonator among the plurality of series arm resonators.
6 more elements
Dependencies are inferred from the claim text.