Multi-mode surface acoustic wave filter
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 acoustic reflectors on opposing sides of the plurality of interdigital transducer electrodes. The acoustic reflectors include acoustic reflector fingers arranged to suppress a spurious response due to shear horizontal mode of the multi-mode surface acoustic wave filter. For example, the acoustic reflector fingers can include stepped lengths and/or slanted pitches to suppress the spurious response due to shear horizontal mode.
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
- acoustic reflectors on opposing sides of the plurality of interdigital transducer electrodes, the acoustic reflectors including acoustic reflector fingers arranged to suppress a spurious response due to shear horizontal mode of the multi-mode surface acoustic wave filter, the acoustic reflector fingers having slanted pitches and stepped lengths, and the multi-mode surface acoustic wave filter 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, the multi-mode surface acoustic wave filter including a plurality of longitudinally coupled interdigital transducer electrodes and acoustic reflectors on opposing sides of the plurality of longitudinally coupled interdigital transducer electrodes, and the acoustic reflectors including acoustic reflector fingers having slanted pitches and stepped lengths;
- and
- during the filtering, suppressing a spurious response due to shear a horizontal mode of the multi-mode surface acoustic wave filter with the acoustic reflectors of the multi-mode surface acoustic wave filter.
A packaged module comprising:
- a packaging substrate;
- a radio frequency switch on the packaging substrate;
- and
- a multi-mode surface acoustic wave filter on the packaging substrate, the multi-mode surface acoustic wave filter configured to filter a radio frequency signal provided by the radio frequency switch, the multi-mode surface acoustic wave filter including a plurality of longitudinally coupled interdigital transducer electrodes and acoustic reflectors on opposing sides of the plurality of longitudinally coupled interdigital transducer electrodes, the acoustic reflectors including acoustic reflector fingers having slanted pitches and stepped lengths, the acoustic reflector fingers arranged to suppress a spurious response due to shear horizontal mode of the multi-mode surface acoustic wave filter.
Dependencies are inferred from the claim text.