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:
Feb. 17, 1987
Filed:
Aug. 05, 1985
Applicant:
Inventor:
Philip C Warder, Ft. Worth, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ; G01R / ;
U.S. Cl.
CPC ...
324 / ; 333 35 ;
Abstract
A directional coupler is disclosed comprising either a stripline or microstrip transmission line coupler apparatus serially coupled to an error correcting circuitry which is designed to minimize the standing wave in the coupled line. Elimination of the standing wave in coupled line results in a directional coupler of better accuracy. The error correcting circuitry uses an impedance mismatch of a preselected magnitude and phase angle which are determined by varying the same at a particular frequency until the standing wave of the coupled line is minimized. In the preferred embodiment, a length of coaxial cable is used.