The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1976
Filed:
Jun. 28, 1974
Paul E Stuckert, Katonah, NY (US);
International Business Machines Corporation, Armonk, NY (US);
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.