Normal coordinate monolithic crystal filter

Details Normal coordinate monolithic crystal filter Normal coordinate monolithic crystal filter

1984-11-07

1985-09-17

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310360, 310361, 333187, H03H 956, H03H 9125

Patent

active

045423555

ABSTRACT:
Enhancement of proper phase and insertion loss response, reduction of undesired mode couplings, and greater latitude in the design with respect to energy trapping in filters, in addition to enhancement of the dynamic frequency-temperature compensation, as well as stress-frequency compensation is provided by arranging the electrode gap of a monolithic crystal filter so that it is perpendicular to the projection of the normal coordinate or eigenvector of the mode utilized along with making the side edges of the electrodes parallel to the direction of the normal coordinate projection. For the doubly rotated SC cut of quartz, using the c-mode, the normal coordinate projection angle, i.e. the axis along which the electrodes are aligned, is substantially 8.2.degree. from the rotated plate (X') axis.

REFERENCES:
patent: 3202846 (1965-08-01), Ballato et al.
patent: 4313071 (1982-01-01), Hermann et al.
patent: 4499395 (1985-02-01), Kahan
Modern Crystal & Mechanical Filters, D. F. Sheahan and R. A. Johnson, IEEE ress, 1977, Sec. II-A; pp. 192-193.
"Doubly Rotated Thickness Mode Plate Vibrators", W. P. Mason and R. N. Thurston, eds., Physical Acoustics, Academic Press, N.Y., 1977; p. 143.

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