Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1982-12-17
1985-04-16
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333187, 333191, 310321, 310328, 310366, 310367, H03H 948, H03H 9205, H03H 913, H03H 956
Patent
active
045112029
ABSTRACT:
A ceramic resonator including an elongated piezoelectric ceramic platelet having an indentation formed in the center in the longitudinal direction, a polarization in the thickness direction where the polarization occurs at least in the indentation; first and second main surfaces; first and third metal thin film electrodes formed on said first main surface and second and fourth metal thin film electrodes formed on said second main surface, the third electrode being separated from the first electrode and the fourth electrode separated from the second electrode where the resonator has a constant vibration based on the dimensions of the region associated with the indentation the vibration being generated at the narrow part when an electrical signal is applied to the electrodes. Moreover, a ceramic filter consisting of plurality of the ceramic resonators connected in series can also be configured.
REFERENCES:
patent: 3437848 (1969-04-01), Borner et al.
patent: 3559116 (1971-01-01), Egerton et al.
patent: 3697788 (1972-10-01), Parker et al.
Shimizu-"New Energy Trapping Techniques", EM Symposium, published Mar. 11, 1980; pp. 1-34.
Fujitsu Limited
Nussbaum Marvin L.
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