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. 24, 2000
Filed:
Jul. 14, 1999
James Imbornone, Methuen, MA (US);
Jean-Marc Mourant, Groton, MA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A planar BALUN circuit comprises two separate parallel branches with three capacitive elements. The values of the capacitive elements are selected to provide impedances which first of all enhance balanced current flow and which also impede and reduce unbalanced current flow. The circuit is provided so as to lie substantially in a single plane as a pattern disposed on a printed circuit board together with either certain discrete capacitive elements or with capacitive structures which are also printed on the board. The BALUN circuits of the present invention are particularly useful for circuits operating in the gigahertz range and are particularly useful in light weight devices such as cellular telephones and cellular telephone systems.