Patents by Inventor Francis William Kellerman

Francis William Kellerman 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).

  • Multi frequency stacked patch antenna with improved frequency band isolation
    Patent number: 6639558
    Abstract: The invention is a stacked patch antenna having a plurality of patch antennas having respective operating frequency bands arranged in a stack, each antenna comprising a radiating conductive patch and a first cable comprising a plurality of coaxial conductors separated from each other by dielectric. A first conductor of the first cable carries the feed signal for the uppermost antenna and is conductively coupled to a null point of the radiating conductive patch of the uppermost antenna and passes through apertures at the null points of the other ones of the antennas in the stack. Each of the successively lower antennas in the stack is coupled to another one of the plurality of conductors of the cable, which conductors reference the other patches to ground. With this arrangement, high isolation is maintained between the frequency operating bands.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: October 28, 2003
    Assignee: Tyco Electronics Corp.
    Inventors: Francis William Kellerman, Thomas Lee Goodwin
  • Multi frequency stacked patch antenna with improved frequency band isolation
    Publication number: 20030146872
    Abstract: The invention is a stacked patch antenna having a plurality of patch antennas having respective operating frequency bands arranged in a stack, each antenna comprising a radiating conductive patch and a first cable comprising a plurality of coaxial conductors separated from each other by dielectric. A first conductor of the first cable carries the feed signal for the uppermost antenna and is conductively coupled to a null point of the radiating conductive patch of the uppermost antenna and passes through apertures at the null points of the other ones of the antennas in the stack. Each of the successively lower antennas in the stack is coupled to another one of the plurality of conductors of the cable, which conductors reference the other patches to ground. With this arrangement, high isolation is maintained between the frequency operating bands.
    Type: Application
    Filed: February 6, 2002
    Publication date: August 7, 2003
    Inventors: Francis William Kellerman, Thomas Lee Goodwin
  • Stacked patch antenna with frequency band isolation
    Patent number: 5940037
    Abstract: A stacked patch antenna (1) is constructed with separately fed patch elements (2, 3) coupled at their respective null points with a coaxial feed (9), the coaxial feed (9) feeding a first patch element (2), a portion of the first patch element (2) connecting its null point with a natural feed point to be fed by the coaxial feed (9), and a second patch element (3) being referenced to ground by the coaxial feed (9).
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: August 17, 1999
    Assignee: The Whitaker Corporation
    Inventors: Francis William Kellerman, William Henry Harned, Richard Alexander Mullins