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. 27, 1994
Filed:
Apr. 18, 1994
Mitsuaki Arakawa, Hillsborough, CA (US);
Masahiro Arakawa, Cambridge, MA (US);
The Regents of the University of California, Oakland, CA (US);
Abstract
A very small sized and highly efficient RF ground breaker for use in magnetic resonance imaging (MRI) is constructed on a printed circuit board. A variable capacitor is used to tune the ground breaker to block the desired radio frequency signals from passing along the outside of a coaxial cable conductor. Preferably, the printed circuit board is double-sided with the ground breaker components being mounted on both sides and with RF conductors being mounted within recesses and serving to interconnect printed circuit traces from one side of the circuit board with those on the other side. In a double ground breaker version, undesirable coupling between proximate RF ground breaker components associated with separate channels are purposely intercoupled by capacitance designed to substantially cancel unwanted inter-channel coupling effects.