Patents by Inventor Robert K. Stilwell

Robert K. Stilwell 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).

  • Backfire bifilar helix antenna
    Patent number: 4608574
    Abstract: A backfire bifilar helix antenna is disclosed having two helically wound conductors made of coaxial cable wherein the two conductors comprise the shield portion of the cable. The coaxial cable of one of the conductors serves as a transmission line for supplying signals to the feed end of the antenna and has its center conductor connected to the shield of the other conductor cable. The nominal input impedance of the antenna may be adjusted to a desired value by conductive surface layers attached to the shield portion of the conductors at the feed end.
    Type: Grant
    Filed: May 16, 1984
    Date of Patent: August 26, 1986
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Carson W. Webster, Robert K. Stilwell