Wave transmission lines and networks – Coupling networks – Delay lines including elastic bulk wave propagation means
Patent
1981-02-11
1982-08-03
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic bulk wave propagation means
333153, 333195, H03H 925, H03H 964
Patent
active
043429700
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.
REFERENCES:
patent: 4268808 (1981-05-01), Melngailis
Haus Hermann A.
Lattes Ana L.
Melngailis John
Lappin Mark G.
Massachusetts Institute of Technology
Nussbaum Marvin L.
Smith, Jr. Arthur A.
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