Grooved piezoelectric ceramic resonator with two poling directions
US4503352A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Dec 15, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/542
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved piezoelectric ceramic resonator in which spurious vibration other than that in a longitudinal direction of a piezoelectric ceramic plate is suppressed. The directions of polarization of the rectangular piezoelectric ceramic plate at opposite sides of a concave groove provided in the piezoelectric ceramic plate are different from each other, and are unequal in magnitude. A portion of the plate between the oppositely polarized portions is not polarized in any predetermined direction. The resulting arrangement improves a spurious characteristic of the piezoelectric ceramic resonator, and also rectifies an imbalance in selectivity characteristic between a high frequency side and a low frequency side, when the resonator is used in an electrical filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.