Multiple resonant electromechanical filters using edge-mode vibration of a long piezoelectric plate
US4396895A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | May 21, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/581
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.