Multiple resonant electromechanical filters using edge-mode vibr

Details Multiple resonant electromechanical filters using edge-mode vibr Multiple resonant electromechanical filters using edge-mode vibr

1981-05-21

1983-08-02

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333197, 333198, H03H 9125, H03H 958, H03H 960, H03H 915

Patent

active

043968953

ABSTRACT:
A multimode piezoelectric mechanical filter using edge-mode piezoelectric transducers, each comprising a semi-infinite or long piezoelectric plate polarized in the thickness direction, and a pair of exciting electrodes formed on the plate at an end portion thereof. Input and output edge-mode transducers are supported at their other ends together with optional resonator elements. The transducer and/or resonator elements are mechanically coupled with one another by a coupling rod at their end portions opposite the support to transmit the edge-mode vibration from one to the other. All of the transducers and resonator elements may be disposed in a common plane and may be integrally formed by punching a single piezoelectric plate to form a monolithic type mechanical filter. In such monolithic type filter, coupling rods are also integrally formed with the transducers and resonators. Alternatively, the transducer regions and/or resonator regions are separated and defined by a slit or slits formed in a large square piezoelectric plate, the bottom portion of each slit being usable as the mechanical coupling.

REFERENCES:
patent: 3086183 (1963-04-01), Schofer

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