Ladder-type electric filter device

Details Ladder-type electric filter device Ladder-type electric filter device

1992-04-09

1993-11-09

Nelli, Raymond A.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310348, H03H 900

Patent

active

052606759

ABSTRACT:
A ladder-type electric filter device in which a casing is partitioned into two compartments, one for containing strip-shaped series piezoelectric resonator elements which are operated at a longitudinal oscillation mode and the other for containing square shaped parallel piezoelectric resonator elements which are operated at a peripheral oscillation mode, each of the series and parallel resonator elements is layered along the height of the casing. Alternatively, an input, output and grounding terminal plates for electrically connecting rectangular piezoelectric resonator elements operated at a longitudinal oscillation mode are integrally formed with a casing for containing the rectangular piezoelectric resonator elements.

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patent: 5057802 (1991-10-01), Ozeki et al.
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patent: 5130680 (1992-07-01), Nagai et al.
patent: 5151672 (1992-09-01), Noto et al.
patent: 5168253 (1992-12-01), Nakagawa et al.

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