Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1974-06-28
1976-01-20
Gensler, Paul L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
330124R, 333 81R, H03H 748
Patent
active
039342131
ABSTRACT:
A broad band directional coupler including a conventional attenuator is disclosed. The coupler permits detection of signals propagating simultaneously in opposite directions on a single-signal path or transmission line. Detection may occur at one or a multiplicity of ports located at arbitrary positions along the line. In the specific embodiments disclosed, the attenuators employed are symmetrical, .pi., O, T, and H attenuator networks. The invention, however, is equally applicable to .pi., O, T or H attenuator networks which are not symmetrical. The specific embodiments shown employing active devices have wide frequency responses which are flat and flat to DC. Where operation down to DC is not required and where a broad band directional coupler comprised entirely of passive elements is desired, a version of the coupler circuit employing transformers is disclosed. The circuits described have application in analog and digital communication paths where two-way information flow exists and where a multiplicity of ports may share the same path.
REFERENCES:
patent: 2395540 (1946-02-01), Edwards
patent: 3611123 (1971-10-01), Mouw et al.
Gensler Paul L.
International Business Machines - Corporation
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