Ladder-type electric filter circuit apparatus

Details Ladder-type electric filter circuit apparatus Ladder-type electric filter circuit apparatus

1988-11-23

1989-09-05

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310348, 333187, H03H 9205, H03H 958

Patent

active

048642592

ABSTRACT:
A ladder-type electric filter circuit apparatus having a plurality of thinner electric filter units wherein each electric filter unit includes a casing of metal into which piezoelectric resonator elements and terminal plates are inserted, and the metal casing is securely mounted on a printed circuit board by soldering. The piezoelectric resonator elements and terminal plates are insulated from the metal casing by an insulating plate and an elastic insulatiang plate which is also served as a vibration or shock absorber for protecting the contained filter from any external vibration or shock propagated through the printed circuit board.

REFERENCES:
patent: 3832761 (1974-09-01), Sheahan et al.
patent: 4353045 (1982-10-01), Matsui et al.
patent: 4639698 (1987-01-01), Nishiki

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