Magnetostrictive surface acoustic wave devices having optimized transducers
AssigneeAgere Systems Optoelectronics Guardian Corp.
InventorsGlenn B. Alers, Kenneth Alexander Ellis, Timothy J. Klemmer, Robert Bruce Van Dover
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Abstract
In accordance with the invention, magnetostrictive saw devices are provided with improved transducer structures for enhanced performance. In one improved device, the transducers are in the form of gratings with interconnected ends for reduced resistance and inductance. In another embodiment, the transducers are shaped to provide apodization. In yet a third embodiment, transducer performance is enhanced by patterning composite structures.
Claims7
In a magnetostrictive surface acoustic wave device comprising a substrate, a layer of magnetostrictive material disposed on the substrate, an input transducer for generating surface acoustic waves on the device and an output transducer, spaced from the input transducer, for receiving the surface acoustic waves,
- at least one of the transducers comprising an array of grid conductors extending transverse to the direction of acoustic wave propagation, each grid conductor having a first end and a second end;
- a conductor connecting the first ends of the grid conductors;
- a conductor connecting the second ends of the grid conductors;
- and
- wherein the grid conductors arc spaced apart by distances which vary along the direction of acoustic wave propagation to produce an apodized device.
In a magnetostrictive surface acoustic wave device comprising a substrate, a layer of magnetostrictive material disposed on the substrate, an input transducer for generating surface acoustic waves on the device and an output transducer, spaced from the input transducer, for receiving the surface acoustic waves,
- at least one of the transducers comprising an array of grid conductors extending transverse to the direction of acoustic wave propagation, each grid conductor having a first end and a second end;
- a conductor connecting the first ends of the grid conductors;
- a conductor connecting the second ends of the grid conductors;
- and
- wherein the magnetostrictive layer is patterned similar to the grid conductors.
Dependencies are inferred from the claim text.