Wave transmission lines and networks – Coupling networks – Delay lines including elastic surface wave propagation means
Patent
1979-05-14
1981-05-26
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic surface wave propagation means
310313A, 310340, 333194, H03H 925, H03H 942, H03H 968
Patent
active
042701058
ABSTRACT:
A surface acoustic wave (SAW) device is provided with short-term and long-term stability by recessing the electrode structure into the surface of the piezoelectric crystal of the device. In addition, the surface is passivated with the silicon polymer, and a cover of the same crystalline material is placed above the electrode structure to prevent absorption of impurities into the surface from the atmosphere. The passivation is believed to reduce the effect of thermal agitation of the bonds of the crystal lattice structure, and thereby prevent the making and breaking of chemical bonds with hydroxyl ions that may have been entrapped from the atmosphere. The SAW device is particularly useful in the construction of stable oscillator circuits wherein the passivation provides improved short-term frequency stability and the cover provides long-term frequency stability.
REFERENCES:
patent: 2769930 (1956-11-01), Sturm
patent: 3885173 (1975-05-01), Lee
patent: 3887887 (1975-06-01), Wagers et al.
patent: 3987378 (1976-10-01), Onodera
patent: 4028646 (1977-06-01), Ikushima et al.
patent: 4037176 (1977-07-01), Ono et al.
patent: 4047129 (1977-09-01), Ishiyama
patent: 4096455 (1978-06-01), Drummond
patent: 4188596 (1980-02-01), Miura
Websters Seventh New Collegiate Dictionary, G and C Merriam Co., Springfield, Mass. .COPYRGT.1961; Title page and pp. 407,809.
Dunnrowicz Clarence J.
Parker Thomas E.
Bartlett Milton D.
Nussbaum Marvin L.
Pannone Joseph D.
Pitruzzella Vincenzo D.
Raytheon Company
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