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US 2023/0188115 A1Published application
Bulk acoustic wave filters for improving noise factor
AssigneeSkyworks Solutions, Inc.
InventorKoichi Hatano
Life of this patent
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Abstract
A ladder type acoustic wave filter is disclosed. The acoustic wave filter can include a plurality of parallel arm resonators and a plurality of series arm resonators, in which an electromechanical coupling coefficient of a parallel arm resonator closest to an input node of the acoustic wave filter among the plurality of parallel arm resonators can be smaller than an electromechanical coupling coefficient of a series arm resonator closest to the input node among the plurality of series arm resonators.
Claims20
A ladder type acoustic wave filter, the acoustic wave filter comprising:
- a plurality of parallel arm resonators;
- and
- a plurality of series arm resonators, an electromechanical coupling coefficient of a parallel arm resonator closest to an input node of the acoustic wave filter among the plurality of parallel arm resonators being smaller than an electromechanical coupling coefficient of a series arm resonator closest to the input node of the acoustic wave filter among the plurality of series arm resonators.
A wireless communication device comprising:
- an antenna;
- and
- a multiplexer coupled to the antenna, the multiplexer including a plurality of filters coupled to a common node and arranged to filter a radio frequency signal, at least one of the plurality of filters including a plurality of parallel arm resonators, and a plurality of series arm resonators, an electromechanical coupling coefficient of a parallel arm resonator closest to an input node of the acoustic wave filter among the plurality of parallel arm resonators being smaller than an electromechanical coupling coefficient of a series arm resonator closest to the input node of the acoustic wave filter among the plurality of series arm resonators.
Dependencies are inferred from the claim text.