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:
Dec. 21, 1976
Filed:
Dec. 23, 1974
Edward S Caragliano, Poughkeepsie, NY (US);
Howard H Nick, LaGrangeville, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A strip-line directional coupler is provided in which the volumetric size is reduced without a reduction in electrical characteristics. The input and output coupling lines are wound into separate spirals each having the same pitch so that they can be located at a fixed distance with respect to one another which is sufficiently close along their entire length to provide coupling of an input signal from the input coupling line to the output coupling line in the backwards direction. A first and second ground plane is located one on either side of and a small distance from each spirally wound input and output coupling line. A dielectric material is located between the input and output lines and between the ground planes and the input and output lines. The spirally wound input and output coupling lines provide improved electrical characteristics so as to enable a reduction of spacing of the first and second ground planes from either side of the spirally wound input and output coupling lines thereby further diminishing the volumetric size of the device into a small, flat package.