Browse Prior Art Database

Broadband Directional (Bridged T) Coupling Circuit

IP.com Disclosure Number: IPCOM000085160D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Stuckert, PE: AUTHOR

Abstract

The circuit illustrated in the figure comprises a broadband directional coupler including a conventional bridged-T attenuator. The coupler permits the selective 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 a line.

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Broadband Directional (Bridged T) Coupling Circuit

The circuit illustrated in the figure comprises a broadband directional coupler including a conventional bridged-T attenuator. The coupler permits the selective 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 a line.

The attenuator comprising two resistors R1, resistors R3 and R4 is symmetrical in nature. The two differential amplifiers designated as ADA have frequency responses which are flat to DC. Where operation down to DC is not required reactive coupling may be used in place of the direct coupling. The coupler circuit has application in analog or digital communication paths where two-way information flow exists, and where a multiplicity of ports may share the same path.

The design equations for the described coupling circuit are:

R1 = Z(0) R4 = Z(0)(K-1) R3 = Z(0)/(K-1) ADA = K/(K-1) where K is the ratio of the attenuator input voltage to the attenuator output voltage, and ADA is the differential amplifier voltage gain for an output at ELR(ERL) equal to EL(ER) and for an output at ERL(ELR) equal to zero for any EL(ER).

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