Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1988-11-18
1989-07-04
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333 12, 333185, 174 521, H03H 701, H03H 100
Patent
active
048454478
ABSTRACT:
A trap filter assembly of the type employed with a video cable system to block a particular band of video frequencies has a housing formed as a generally rectangular block of square cross-section, made of cast aluminum or other suitable material. A cavity formed in the housing has first and second compartments which are separated from one another by a pair of barrier walls that define therebetween a channel passageway that extends from one corner of the first cavity compartment to a laterally opposite corner of the second cavity compartment. This prevents any direct line of sight signal path for stray video signals between the first and second compartments. First and second printed circuit filter boards are mounted in the compartments, preferably by a threaded fastener which mounts the boards onto respective pedestals in the compartments. A bare-braid coax conductor passes through the channel between the barrier walls and unites the signal paths on the two boards in the respective compartments. A cover or closure plate of a suitable conductive material closes off the access opening to the cavity. The male connector preferably has a rotatable threaded sleeve. This filter trap assembly can be installed in an on-premise enclosure. Signal degradation is reduced by half.
REFERENCES:
patent: 1557229 (1925-10-01), Zobel
patent: 3522485 (1970-08-01), De Metrick
patent: 3644848 (1972-02-01), Kruczek
patent: 4015070 (1977-03-01), Theurer
patent: 4152671 (1979-05-01), Tuma et al.
patent: 4159506 (1979-06-01), Latasiewicz et al.
patent: 4451803 (1984-05-01), Holdsworth et al.
patent: 4701726 (1987-10-01), Holdsworth
patent: 4749972 (1988-06-01), Schulz et al.
Northeast Filter Co., Inc.
Nussbaum Marvin L.
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