Cascaded resonator having reflector electrodes with different pitches
AssigneeSkyworks Solutions, Inc.
InventorsXiao Zhang, Tomoya Komatsu, Yiliu Wang
Life of this patent
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Abstract
An acoustic wave device comprises a piezoelectric substrate, interdigital transducer electrodes having an electrode pitch λ0, and first and second reflector gratings disposed on opposite respective sides of the interdigital transducer electrodes in a propagation direction of a main acoustic wave through the acoustic wave device, the first reflector grating having a reflector electrode pitch λ1 throughout an entirety of the first reflector grating that is different than a reflector electrode pitch λ2 throughout an entirety of the second reflector grating to suppress ripples in a conductance curve of the acoustic wave device.
Claims13
An acoustic wave device comprising:
- a piezoelectric substrate;
- interdigital transducer electrodes having an electrode pitch λ0;
- first and second reflector gratings disposed on opposite respective sides of the interdigital transducer electrodes in a propagation direction of a main acoustic wave through the acoustic wave device, the first reflector grating having a reflector electrode pitch λ1 throughout an entirety of the first reflector grating that is different than a reflector electrode pitch λ2 throughout an entirety of the second reflector grating to suppress ripples in a conductance curve of the acoustic wave device, each of λ1 and λ2 being greater than λ0 by between about 2% and about 5%.
An electronic device including at least two filters coupled to an antenna node, a first of the at least two filters being a ladder filter having a series resonator closest to the antenna node, the series resonator comprising:
- a piezoelectric substrate;
- interdigital transducer electrodes having an electrode pitch λ0;
- first and second reflector gratings disposed on opposite respective sides of the interdigital transducer electrodes in a propagation direction of a main acoustic wave through the acoustic wave device, the first reflector grating having a reflector electrode pitch λ1 throughout an entirety of the first reflector grating that is different than a reflector electrode pitch λ2 throughout an entirety of the second reflector grating to suppress ripples in a conductance curve of the acoustic wave device;
- second interdigital transducer electrodes in series with the interdigital transducer electrodes;
- and
- third and fourth reflector gratings disposed on opposite respective sides of the second interdigital transducer electrodes in the propagation direction, the third reflector grating having a different electrode pitch λ3 than an electrode pitch λ4 of the fourth reflector grating, each of λ1, λ2, λ3, and λ4 being different.
An electronic device comprising an electronics module including a radio frequency filter, the radio frequency filter including an acoustic wave device including a piezoelectric substrate, interdigital transducer electrodes having an electrode pitch λ0, and first and second reflector gratings disposed on opposite respective sides of the interdigital transducer electrodes in a propagation direction of a main acoustic wave through the acoustic wave device, the first reflector grating having a reflector electrode pitch λ1 throughout an entirety of the first reflector grating that is different than a reflector electrode pitch λ2 throughout an entirety of the second reflector grating to suppress ripples in a conductance curve of the acoustic wave device, second interdigital transducer electrodes in series with the interdigital transducer electrodes, and third and fourth reflector gratings disposed on opposite respective sides of the second interdigital transducer electrodes in the propagation direction, the third reflector grating having a different electrode pitch λ3 than an electrode pitch λ4 of the fourth reflector grating, each of λ1, λ2, λ3, and λ4 being different.
Dependencies are inferred from the claim text.