Surface acoustic wave resonators
AssigneeSkyworks Solutions, Inc.
InventorAkira Ochiai
Life of this patent
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Abstract
Disclosed herein are embodiments of a ladder-type filter comprising a plurality of series arm resonators and a plurality of parallel arm resonators, at least one of the plurality of series arm resonators including a piezoelectric substrate and an interdigital transducer electrode disposed on the piezoelectric substrate, an aperture W1 of the interdigital transducer electrode being configured to be less than 13λ, where λ is a wavelength of a surface acoustic wave excited by the interdigital transducer electrode. The relationship between the aperture W1 and the wavelength λ can be W1 < 13λ, W1 < 11λ, W1 < 4λ, or W1 > 6λ.
Claims20
A surface acoustic wave resonator comprising:
- a piezoelectric substrate;
- and
- an interdigital transducer electrode disposed on the piezoelectric substrate, an aperture of the interdigital transducer electrode being configured to be less than 13λ, λ, being a wavelength of a surface acoustic wave excited by the interdigital transducer electrode.
A ladder-type acoustic wave filter comprising a plurality of series arm resonators and a plurality of parallel arm resonators, at least one of the plurality of series arm resonators including a piezoelectric substrate and an interdigital transducer electrode disposed on the piezoelectric substrate, an aperture of the interdigital transducer electrode being configured to be less than 13λ, λ, being a wavelength of a surface acoustic wave excited by the interdigital transducer electrode.
A acoustic wave filter assembly comprising:
- a first acoustic wave filter connected to a common node;
- and
- a second acoustic wave filter connected to the common node, at least one of the first and second acoustic wave filters being a ladder-type acoustic wave filter including a plurality of series arm resonators and a plurality of parallel arm resonators, at least one of the plurality of series arm resonators including a piezoelectric substrate and an interdigital transducer electrode disposed on the piezoelectric substrate, an aperture of the interdigital transducer electrode being configured to be less than 13λ, λ, being a wavelength of a surface acoustic wave excited by the interdigital transducer electrode.
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 being an acoustic wave filter including a plurality of series arm resonators and a plurality of parallel arm resonators, at least one of the plurality of series arm resonators including a piezoelectric substrate and an interdigital transducer electrode disposed on the piezoelectric substrate, an aperture of the interdigital transducer electrode being configured to be less than 13λ, λ, being a wavelength of a surface acoustic wave excited by the interdigital transducer electrode.
Dependencies are inferred from the claim text.