Back to results
US 12,040,777 B2Granted
Modified saw transducer, saw resonator, and saw filter comprising same
AssigneeRF360 Singapore Pte. Ltd.
InventorMatthias Pernpeintner
Life of this patent
Estimating the term…
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.
Claims15
A surface acoustic wave (SAW) transducer comprising:
- a plurality of unit cells that are arranged consecutively in a longitudinal direction, the plurality of unit cells having parameters including a length Li and a metallization ratio ni, wherein each unit cell of the plurality of unit cells comprises two or more electrode fingers connected to different electrical potentials and is configured to produce a wavelet Wi, wherein the plurality of unit cells show a variation of the parameters Li and ηi over a length of the SAW transducer;
- wherein the variation of the parameters Li and ηi over the length of the SAW transducer is such that, for each unit cell, an eigenfrequency of a main operating SAW mode is unchanged and wavelets superimpose constructively at the eigenfrequency of the main operating SAW mode.
A surface acoustic wave (SAW) transducer comprising:
- a plurality of unit cells that are arranged consecutively in a longitudinal direction, the plurality of unit cells having parameters including a length Li, wherein each unit cell of the plurality of unit cells comprises two or more electrode fingers connected to different electrical potentials and is configured to produce a wavelet Wi, wherein the plurality of unit cells show a variation of Li and another frequency-relevant parameter over a length of the transducer;
- wherein the variation of the parameters Li and the another frequency-relevant parameter over the length of the transducer is such that, for each unit cell, an eigenfrequency of a main operating SAW mode is unchanged and wavelets superimpose constructively at the eigenfrequency of the main operating SAW mode.
Dependencies are inferred from the claim text.