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US 5,073,763 AGranted
Group single-phase unidirectional transducers with 3/8.lambda.and 5/8.lambda. sampling
AssigneeRF Monolithics, Inc.
InventorPeter Wright
Life of this patent
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Abstract
Novel GSPUDT structures are disclosed with 3/8.lambda. and 5/8.lambda. group sampling with 3.lambda. and 5.lambda. group responses. Reflectionless or unidirectional transducers, and broadband notch elements are all implementable with these new configurations. These GSPUDTs are similar to the conventional SPUDT and the "Hopscotch" transducers in that single level versions are reflectionless. Unidirectional characteristics are only obtainable from a two-level structure.
Claims34
An improved surface acoustic wave transducer comprising:
- a pattern of at least three adjacent interdigitated electrodes on a piezoelectric substrate;
- and
- each of said interdigitated electrodes lying on a 3/8.lambda. grid such that adjacent electrodes have a center-to-center spacing of 3/8.lambda. where .lambda.=one wavelength.
An improved surface acoustic wave transducer comprising:
- a pattern of at least three adjacent interdigitated electrodes on a piezoelectric substrate;
- and
- each of said interdigitated electrodes lying on a 5/8.lambda. grid such that adjacent electrodes have a center-to-center spacing on 5/8.lambda. where .lambda.=one wavelength.
Dependencies are inferred from the claim text.