Broad band directional coupling circuit

Details Broad band directional coupling circuit Broad band directional coupling circuit

H - Electricity

03

H

333/8

H03H 7/00 (2006.01) H03H 7/48 (2006.01)

Patent

CA 1067969

BOARD BAND DIRECTIONAL COUPLING CIRCUIT ABSTRACT OF THE DISCLOSURE A board band directional coupler including a conven- tional 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 net works. 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 direc- tional 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.

224560

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