Electrical signal filter

Details Electrical signal filter Electrical signal filter

1993-12-29

1995-07-11

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333176, 333185, H03H 701, H03H 712

Patent

active

054324882

ABSTRACT:
The object of this invention is to provide an electrical signal filter for improving electrical characteristics and reliability of the electrical signal filter for use in a cable television by protecting it from moisture. In an electrical signal filter having a filter portion provided inside a cylinder-shaped shield case, the filter portion includes a first filter circuit and a second filter circuit respectively mounted on circuit boards, and a shield member arranged between the first filter and the second filter. In the electrical signal filter, a moisture-proof material is applied to an entire surface of the filter portion and a contact area where the cylinder-shaped shield case containing the circuit boards and the filter portion therein contacts external components.

REFERENCES:
patent: 4451803 (1984-05-01), Holdsworth et al.
patent: 4701726 (1987-10-01), Holdsworth
patent: 4758808 (1988-07-01), Sasaki et al.
patent: 4820202 (1989-04-01), Edwards et al.
patent: 4845447 (1989-07-01), Holdsworth
patent: 4901043 (1990-02-01), Palinkas
patent: 5150087 (1992-09-01), Yoshie et al.
patent: 5278525 (1994-01-01), Palinkas

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