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:
Oct. 14, 2003
Filed:
May. 11, 1999
Peter Q. Oakley, Clinton, WA (US);
Fluke Corporation, Everett, WA (US);
Abstract
A balance network directional coupler (BNDC) allows for effective coupling to sources of transmitted signals, communication lines, and devices that process received signals. The BNDC includes a transmission port, first and second amplifiers, a reception port, a communication line port, a transformer system, and a balance network. The second amplifier has a second gain of a polarity opposite the polarity of the polarity of the first gain. The transformer system has first and second windings each having first and second terminals, the first and second terminals of the first winding being electrically coupled to the communication line port, the first terminal of the second winding being electrically coupled to the reception port, and the second terminal of the second winding being electrically coupled to an output terminal of the second amplifier. The second winding of the transformer system has an equivalent impedance at the first and second terminals based on an impedance of the transformer system and an impedance of a communication line. The balance network is electrically coupled to an output terminal of the first amplifier and to the reception port. The balance network is configured to have an impedance relative to the equivalent impedance at the second winding of the transformer system selected so that the reception port is substantially decoupled from the transmission port.