Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1979-05-21
1981-05-19
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333142, 333153, 333187, H03H 954, H03H 964, H03H 925
Patent
active
042688086
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: 3931598 (1976-01-01), Bongianni
Coldren et al.-"Saw Resonator Overview: Design and Performance Tradeoffs", 1978 Ultrasonics Symposium Proceedings IEEE Cat. No. 78CH 1344-1SU; pp. 422-431.
Wagers-"Plate Mode Coupling in Acoustic Surface Wave Devices", IEEE Transactions on Sonics and Ultrasonics, vol. SU-23, No. 2, Mar. 1976; pp. 113-127.
Ronnekleiv et al.-"On the Theory of Acoustic Surface-Wave to Bulk-Wave Scattering by Grooves", Journal of Applied Physics, vol. 47, No. 10, Oct. 1976; pp. 4422-4425.
Goruk et al.-"Surface to Bulk Mode Conversion at Interfaces on Y-Z LiNbO.sub.3," Applied Physics Letters, 32(5), 1 Mar. 1978; pp. 265-266.
Bell, Jr. et al.-"Surface-Acoustic Wave Resonators", Proceedings of the IEEE, vol. 64, No. 5, May 1976; pp. 711-721.
Li-"310-MHZ Saw Resonator with Q at the Material Limit", Applied Physics Letters, vol. 31, No. 7, 1 Oct. 1977; pp. 407-409.
Lappin Mark G.
Massachusetts Institute of Technology
Nussbaum Marvin L.
Smith, Jr. Arthur A.
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