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:
Jun. 18, 2002
Filed:
Mar. 23, 2000
Ray M. Johnson, Shady Cove, OR (US);
Other;
Abstract
A three port distributed waveguide circulator has a hybrid coupler section connected to a waveguide section which is bifurcated by a central web plate to produce reduced height stacked waveguides and which is loaded with a distributed non-reciprocal ferromagnetic material for producing relative phase shifting of the microwave power traveling through the reduced height guides. In one embodiment, the coupler output is stepped down to the reduced height waveguides by a stepped transformer between the output of the hybrid coupler and the bifurcated input end of the bifurcated waveguide section. Alternatively, a tapered transformer is provided. A static magnetic circuit is provided for producing transverse static magnetic fields in the reduced height waveguides necessary for the distributed ferromagnetic material to exhibit non-reciprocal properties. The ferromagnetic material in the reduced height waveguides of the bifurcated waveguide is preferably in the form of ferromagnetic strips which are secured to the outer broadwalls of the bifurcated guides and which are cooled by cooling tubes running along the outside of the broadwalls.