Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1980-10-01
1982-09-14
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333101, 333181, 333185, 358 86, 455 8, H03H 746, H03H 701, H04N 710
Patent
active
043497950
ABSTRACT:
In an amplifier station for a trunk system, switching apparatus responsive to the absence or presence of a control signal selectively passes R. F. signals in a prescribed frequency band on a main transmission line to first and second lines. During normal operation of the amplifier relay coils are energized so as to engage second and third contacts for passing signals on the second line with amplification. When the amplifier is operating properly, PIN diodes short opposite ends of the first line for improving isolation in the station equipment. In the event of amplifier malfunction, first and third contacts are engaged thereby providing transmission along the first line. A tubular conductive member surrounds the switch contacts so as to provide capacitive coupling thereto. The tubular member is capacitively coupled to a ground plane to thereby by-pass signals which are above the desired passband of the trunk system.
REFERENCES:
patent: 3086091 (1963-04-01), Reid
patent: 3566020 (1971-02-01), Kinross et al.
patent: 4167714 (1979-09-01), Flora
Cannon Russell A.
GTE Automatic Electric Laboratories Inc.
Nussbaum Marvin L.
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