Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1982-07-08
1984-06-12
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313D, 333194, 333196, H03H 964, H03H 925
Patent
active
044544880
ABSTRACT:
A surface wave resonator device (10) includes a substrate (12) having a surface layer of piezoelectric material (14), first and second reflective grating structures (16 and 18) and a middle grating structure (40). The middle grating structure includes an odd multiple of one-quarter wavelength for the resonant frequency of the first and second reflective grating structures. The surface acoustic wave transmission velocity of the middle grating structure is substantially equal to the surface acoustic wave transmission velocity of the first and second reflective grating structures. One arrangement includes a surface acoustic wave input transducer (52) and a surface acoustic wave output transducer (58).
REFERENCES:
patent: 3886504 (1975-05-01), Hartmann et al.
patent: 3970970 (1976-07-01), Worley
patent: 4054851 (1977-10-01), Borner et al.
patent: 4144507 (1979-03-01), Shreve
Shreve et al.-"Fabrication Saw of Resonators for Improved Long Term Aging", Hewlett-Packard Laboratories, Palo Alto, Ca., 94304, 1978; pp. 573-579.
Tanski-"Developments in Resonators on Quartz", 1977 Ultrasonics Symposium Proceedings, IEEE Cat. #77CH1264-1SU; pp. 900-904 and 904A.
Nussbaum Marvin L.
R F Monolithics, Inc.
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