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US 11,502,668 B2Granted
Multi-mode surface acoustic wave filter with stepped acoustic reflectors
AssigneeSkyworks Solutions, Inc.
InventorRei Goto
Life of this patent
Estimating the term…
Abstract
Multi-mode surface acoustic wave filters are disclosed. A multi-mode surface acoustic wave filter can include a plurality of interdigital transducer electrodes that are longitudinally coupled to each other and stepped acoustic reflectors on opposing sides of the plurality of interdigital transducer electrodes. The acoustic reflectors include acoustic reflector fingers with stepped lengths.
Claims20
A multi-mode surface acoustic wave filter comprising:
- a plurality of interdigital transducer electrodes including a first interdigital transducer electrode and a second interdigital transducer electrode, the first interdigital transducer electrode being longitudinally coupled to the second interdigital transducer electrode, and the first interdigital transducer electrode including interdigital transducer electrode fingers;
- and
- acoustic reflectors on opposing sides of the plurality of interdigital transducer electrodes, the acoustic reflectors including acoustic reflector fingers with stepped lengths, a first finger of the acoustic reflector fingers located closer to the plurality of interdigital transducer electrodes having a longer length than a second finger of the acoustic reflector fingers located farther from the plurality of interdigital transducer electrodes, the interdigital transducer electrode fingers having a smaller pitch than the acoustic reflector fingers, and the multi-mode surface acoustic wave filter being configured to filter a radio frequency signal.
A method of filtering a radio frequency signal with a multi-mode surface acoustic wave filter, the method comprising:
- providing a radio frequency signal to the multi-mode surface acoustic wave filter;
- filtering the radio frequency signal with the multi-mode surface acoustic wave filter that includes a plurality of interdigital transducer electrodes and acoustic reflectors on opposing sides of the interdigital transducer electrodes, the acoustic reflectors including acoustic reflector fingers with stepped lengths, a first finger of the acoustic reflector fingers located closer to the plurality of interdigital transducer electrodes having a longer length than a second finger of the acoustic reflector fingers located farther from the plurality of interdigital transducer electrodes, and a first interdigital transducer electrode of the interdigital transducer electrodes including interdigital transducer electrode fingers having a smaller pitch than the acoustic reflector fingers;
- and
- during the filtering, suppressing a spurious response due to a shear horizontal mode of the multi-mode surface acoustic wave filter with the acoustic reflectors of the multi-mode surface acoustic wave filter.
1 more element
A wireless communication device comprising:
- a radio frequency front end that includes a multi-mode surface acoustic wave filter configured to filter a radio frequency signal, the multi-mode surface acoustic wave filter including a plurality of interdigital transducer electrodes and acoustic reflectors on opposing sides of the plurality of interdigital transducer electrodes, the acoustic reflectors including acoustic reflector fingers having stepped lengths, a first finger of the acoustic reflector fingers located closer to the plurality of interdigital transducer electrodes having a longer length than a second finger of the acoustic reflector fingers located farther from the plurality of interdigital transducer electrodes, and a first interdigital transducer electrode of the plurality of interdigital transducer electrodes including interdigital transducer electrode fingers having a smaller pitch than the acoustic reflector fingers;
- and
- an antenna in communication with the radio frequency front end.
Dependencies are inferred from the claim text.