Thickness shear vibration type double mode filter having a passi

Details Thickness shear vibration type double mode filter having a passi Thickness shear vibration type double mode filter having a passi

1996-06-10

1998-09-15

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310326, 310321, H03H 954, H03H 902

Patent

active

058085220

ABSTRACT:
A thickness shear vibration type double mode filter includes two or more vibrating elements disposed in parallel on a piezoelectric substrate and a coupling capacitor formed on the piezoelectric substrate at a position intermediate two of the vibrating elements. The coupling capacity includes a capacitor electrode formed on one main surface of the piezoelectric substrate and an opposing ground electrode formed on a second main surface of the substrate. Input/output electrodes of the vibrating elements are formed on the same surface of the piezoelectric substrate as the capacitor electrode. A damper formed of a resin material on which no solder adheres is formed on top of the capacitor electrode and has sufficient mass to suppress undesired vibration in the area of the coupling capacitor.

REFERENCES:
patent: 3676724 (1972-07-01), Berlincourt et al.
patent: 4037180 (1977-07-01), De Wild
patent: 5446335 (1995-08-01), Hino

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