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:
Jul. 15, 1986
Filed:
Jun. 03, 1985
Ronald E Blight, Framingham, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A magnetically tuned resonant circuit for coupling r.f. energy between input and output coupling circuits thereof in a first mode of operation and isolating such energy between such coupling circuits in a second mode of operation includes a current path circuit provided to selectively change the resonant frequency of the magnetically tuned resonant circuit. In a first embodiment of the current path circuit, a microstrip transmission line used to form one of such coupling circuits, having a pair of planar spaced strip conductor portions adjacent a resonant body, is configured to provide the current path around such body. In the presence of an external magnetic field H.sub.DC, a pulse of current is fed around the current path and in response thereto provides a pulse magnetic field H.sub.DCp in the region of the resonant body. Such field H.sub.DCp either aids or opposes the external magnetic field H.sub.DC and in response thereto shifts a resonant frequency .omega..sub.o of such circuit in accordance with the equation .omega..sub.o =.gamma.(H.sub.DC .+-.H.sub.DCp) where .gamma. is a quantity known as the gyromagnetic ratio. In an alternate embodiment of the circuit, the circuit includes a coil supported on a dielectric substrate to provide the current path, with such coil being disposed adjacent the resonant body. A pulse of current is fed to the coil providing a magnetic field H.sub.DCp, and in the presence of the external magnetic field H.sub.DC, the resonant frequency of such circuit is shifted in accordance with the equation .omega..sub.o =.gamma.(H.sub.DC .+-.H.sub.DCp).