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US 11,962,285 B2Granted
Acoustic wave device, duplexer, and filter device
AssigneeMurata Manufacturing Co., Ltd.
InventorJunpei Yasuda
Life of this patent
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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, or from which a signal is output;
- and
- a plurality of resonators provided on the piezoelectric substrate and each including an IDT electrode;
- wherein
- the plurality of resonators include a plurality of series arm resonators and at least one longitudinally coupled resonator 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 duties of all of the IDT electrodes of the plurality of series arm resonators and the at least one longitudinally coupled resonator on the series arm electrically connecting the antenna terminal to the signal terminal.
6 more elements
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, or from which a signal is output;
- and
- at least one ground terminal provided on the piezoelectric substrate and defining a ground potential;
- and
- a plurality of resonators provided on the piezoelectric substrate and each including an IDT electrode;
- wherein
- the plurality of resonators include a plurality of series arm resonators and at least one longitudinally coupled resonator on a series arm electrically connecting the antenna terminal to the signal terminal, and a plurality of parallel arm resonators electrically connected between the series arm and the ground potential;
- 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 duties of all of the IDT electrodes of the plurality of series arm resonators and the at least one longitudinally coupled resonator on the series arm electrically connecting the antenna terminal to the signal terminal.
8 more elements
Dependencies are inferred from the claim text.