Ladder type filter with adjustable resonator positioning member

Details Ladder type filter with adjustable resonator positioning member Ladder type filter with adjustable resonator positioning member

1995-02-14

1996-11-05

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333189, H03H 9205

Patent

active

055721737

ABSTRACT:
There is provided a ladder type electric filter having a pair of vertically arranged parallel resonators and a pair of series resonators arranged side by side above the parallel resonators and, at the same time, held free from degradation in the performance of the filter, wherein the abutting surfaces of the raised connecting sections of a connecting terminal member that are held in close contact with the respective lower surface-electrodes of the series resonators partly overlap with the abutting surface of the raised connecting section of an output terminal member that is held in close contact with the upper surface-electrode of the upper parallel resonator if viewed from above. A pair of position controlling projections are formed on an insulating shield plate for hermetically sealing the opening of a casing and the centers of the series resonators are respectively defined by the rear end walls of the space regions of the casing so that the centers of the series resonators, those of the parallel resonators and the raised connecting sections, are longitudinally aligned.

REFERENCES:
patent: 4864259 (1989-09-01), Takamoro et al.
patent: 5260675 (1993-11-01), Ogawa et al.
patent: 5392012 (1995-02-01), Iwata et al.
patent: 5426401 (1995-06-01), Ogawa et al.

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