Modified saw transducer, saw resonator, and saw filter comprising same
AssigneeRf360 Europe GmbH
InventorMatthias PERNPEINTNER
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Abstract
A SAW transducer and a SAW resonator are proposed composed of consecutively arranged unit cells of length L. Slight geometry or material variations such as variations of the metallization ration or the unit cell length L affecting the pitch) between these unit cells result in improved spurious mode suppression while the main mode performance is unaffected.
Claims17
-13. (canceled)
A SAW transducer comprising unit cells that are arranged consecutively in a longitudinal direction, the unit cells having a length Li and a metallization ratio ηI, wherein each unit cell
- comprises two or more electrode fingers connected to different electrical potentials, wherein the unit cells show a variation of Li and ηi over a length of the transducer.
A SAW transducer comprising of unit cells that are arranged consecutively in a longitudinal direction, the unit cells having a length Li, wherein each unit cell
- comprises two or more electrode fingers connected to different electrical potentials, wherein the unit cells show a variation of Li and another frequency-relevant parameter over a length of the transducer.
A SAW resonator comprising of one or more transducers and one or more reflectors where
- the one or more reflectors is composed of reflector unit cells that are arranged consecutively in a longitudinal direction
- each reflector unit cell comprises two or more reflector fingers
- at least two frequency-relevant geometry and/or material parameters of the reflector unit cells differ from the corresponding parameters in the neighboring transducer.
Dependencies are inferred from the claim text.