Patents by Inventor Fred J. Rosenbaum

Fred J. Rosenbaum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High power reciprocal co-planar waveguide phase shifter
    Patent number: 3986149
    Abstract: A rectangular toroid of a substrate material has a ferrite arc plasma sprayed into a channel toroid leaving two faces exposed. An off center aperture receives a drive winding which surrounds one long side of the toroid, the other long side is covered by three co-planar and parallel metal strips, slightly spaced and having ferrite material between the strips and forming a co-planar surface with the metal strips.
    Type: Grant
    Filed: August 29, 1975
    Date of Patent: October 12, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Douglas H. Harris, Fred J. Rosenbaum
  • Wide-band microwave circulator
    Patent number: 3935548
    Abstract: A planar Y-junction microwave circulator formed by depositing on a ferrite substrate a metallization pattern consisting of a central resonant disc and three transmission line ports radially extending from the periphery of the disc at junctions spaced apart by 120.degree.. The transmission characteristics of the circulator are controlled by a DC magnetic field which biases the ferrite. Wide-band operation on the order of one octave is achieved by using larger port coupling angles and a smaller disc radius than are conventionally used.
    Type: Grant
    Filed: June 4, 1974
    Date of Patent: January 27, 1976
    Assignee: The Washington University
    Inventors: Fred J. Rosenbaum, You-Sun Wu