Acoustic wave device
First Claim
1. A surface acoustic wave (SAW) device comprising:
- A. a crystal substrate having two substantially planar surfaces,B. a first SAW-to-plate mode coupler on a first of said surfaces, said first coupler including;
first SAW converting means for converting a portion of an incident SAW to a bulk acoustic wave (BAW), said first SAW converting means including a plurality of parallel linear surface perturbations, andfirst BAW converting means for converting a portion of an incident BAW to a SAW, said first BAW converting means including said plurality of surface perturbations,C. a first BAW reflector on the first of said surfaces including means for reflecting a portion of an incident BAW,D. a second BAW reflector on the second of said surfaces including means for reflecting a portion of an incident BAW,wherein said second BAW reflector is positioned to reflect a portion of BAW'"'"'s incident thereon and propagating from said first SAW converting means and said first BAW reflector, to said first BAW converting means, andwherein said first BAW reflector is positioned to reflect a portion of BAW'"'"'s incident thereon and propagating from said second BAW reflector, to said second BAW reflector, andwhereby SAW'"'"'s propagating on said first surface at said first BAW converting means resonantly interact with SAW'"'"'s produced on said first surface by said first BAW converting means.
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Accused Products
Abstract
A surface acoustic wave (SAW) device including a crystal substrate having two substantially planar surfaces and at least one SAW-to-plate mode coupler positioned on one of the surfaces. The SAW-to-plate mode coupler includes a plurality of parallel, linear surface perturbations. The surface perturbations are adapted to convert a portion of an incident SAW to a bulk acoustic wave (BAW). In addition, the coupler is adapted to convert a portion of an incident BAW (from the crystal bulk region) to a SAW at those surface perturbations. In addition, the planar surfaces of the crystal substrate are adapted to reflect portions of incident BAW'"'"'s. The coupler is positioned with respect to the crystal characteristics so that SAW'"'"'s and BAW'"'"'s resonantly interact at the coupler. In alternative configurations, a second SAW-to-plate mode coupler is positioned on the second surface of the crystal substrate. This second surface coupler also is adapted to convert a portion of an incident SAW to a bulk acoustic wave (BAW) at a plurality of parallel surface perturbations, and to convert a portion of an incident BAW to a SAW at those perturbations. The couplers are positioned in view of the crystal characteristics so that the BAW'"'"'s and SAW'"'"'s resonantly interact at the couplers.
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Citations
21 Claims
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1. A surface acoustic wave (SAW) device comprising:
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A. a crystal substrate having two substantially planar surfaces, B. a first SAW-to-plate mode coupler on a first of said surfaces, said first coupler including; first SAW converting means for converting a portion of an incident SAW to a bulk acoustic wave (BAW), said first SAW converting means including a plurality of parallel linear surface perturbations, and first BAW converting means for converting a portion of an incident BAW to a SAW, said first BAW converting means including said plurality of surface perturbations, C. a first BAW reflector on the first of said surfaces including means for reflecting a portion of an incident BAW, D. a second BAW reflector on the second of said surfaces including means for reflecting a portion of an incident BAW, wherein said second BAW reflector is positioned to reflect a portion of BAW'"'"'s incident thereon and propagating from said first SAW converting means and said first BAW reflector, to said first BAW converting means, and wherein said first BAW reflector is positioned to reflect a portion of BAW'"'"'s incident thereon and propagating from said second BAW reflector, to said second BAW reflector, and whereby SAW'"'"'s propagating on said first surface at said first BAW converting means resonantly interact with SAW'"'"'s produced on said first surface by said first BAW converting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification