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:
Mar. 25, 2014
Filed:
May. 16, 2011
John Muir, North Chelmsford, MA (US);
John Muir, North Chelmsford, MA (US);
Auriga Measurement Systems, LLC, Chelmsford, MA (US);
Abstract
An RF circuit includes a balun circuit comprised of a coaxial cable having a desired characteristic impedance and having a first port coupled to a first port of said RF circuit and a second port and a transformer circuit having a first port coupled to the second port of the balun. The transformer circuit is comprised of a pair of coaxial cables, each having a desired characteristic impedance and each having a ferrite coupled thereto. The interconnects between center conductors and outer conductors in the transformer are made symmetrical such that a resonance with a frequency determined by the inductance and capacitance of the coaxial cables does not occur, preventing any nulls in an insertion loss characteristic of the RF circuit. The ferrite is selected to act as a circuit element having an impedance characteristic which is higher than the impedance characteristic of the coaxial cable.