Composite longitudinal vibration mechanical filter and...

Details Composite longitudinal vibration mechanical filter and... Composite longitudinal vibration mechanical filter and...

H - Electricity

03

H

356/200, 333/59

H03H 9/54 (2006.01) H03H 3/02 (2006.01) H03H 9/09 (2006.01) H03H 9/50 (2006.01)

Patent

CA 2010722

ABSTRACT OF THE DISCLOSURE A composite longitudinal vibration mechanical fil- ter for delivering out a supplied high-frequency signal in a predetermined frequency range includes a plurality of vib- ratable bodies including input and output longitudinal vib- ratable tuning bars with piezoelectric members superposed thereon, coupling elements by which the longitudinally vib- ratable tuning bars are coupled to each other, supporting elements projecting respectively from the input and output longitudinally vibratable tuning bars, and a holder to which the supporting elements are attached. Grooves are defined in the longitudinally vibratable tuning bars at the same time that they are fabricated. The grooves extend in the direction in which the longitudinally vibratable tuning bars are longitudinally vibratable, and are shorter than the length of the longitudinally vibratable tuning bars. Through holes may instead be defined in the longitudinally vibratable tuning bars, the through holes having an opening size smaller than the wavelength of the longitudinal vibra- tion of the longitudinally vibratable tuning bars. Piezoelectric members are fixedly superposed on the input and output longitudinally vibratable tuning bars in sand- wiching relation thereto.

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