Bidirectional communication line filter and surge protector

Details Bidirectional communication line filter and surge protector Bidirectional communication line filter and surge protector

1990-11-06

1992-03-31

LaRoche, Eugene R.

Wave transmission lines and networks

Transmission line inductive or radiation interference...

333181, 361111, 361119, H04B 328, H02H 322

Patent

active

051011808

ABSTRACT:
This invention relates to a communication line filter for use in series with communication lines. The communication line filter provides for surge protection from voltage spikes and provides frequency filtering to remove selected interference signals from other radiating sources. The communication line filter comprises: two signal conductors linked together by a fuse; a common signal ground; and two shunts for shunting a surge current between the signal conductors and the common signal ground. The shunts provide protection from short duration voltage spikes while the fuse provides protection from longer duration overvoltages. The communication line filter functions effectively, independent of the direction of current flow along the communication line with respect the line filter. The two shunts and the fuse are selected to provide the required capacitance and impedance respectively, to form a suitable frequency notch filter.

REFERENCES:
patent: 4023071 (1977-05-01), Fussell
patent: 4792310 (1988-12-01), Hori et al.
patent: 4809124 (1989-02-01), Kresge
patent: 4920328 (1990-04-01), Hayashi et al.
patent: 4922366 (1990-05-01), Van Dick
patent: 4979071 (1990-12-01), Ito et al.

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