Patents by Inventor Steven Thomas Dunbar

Steven Thomas Dunbar 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).

  • Method and apparatus for changing the electrical characteristics of an antenna in a communications system
    Patent number: 6285333
    Abstract: A method and apparatus for changing the electrical characteristics of an antenna in a communications system includes first and second conductive portions separated by a slot. Circuit elements are coupled between the first and second conductive portions, the circuit elements being operably controlled by a bias current to control flow of RF current within the first and second conductive elements, wherein the path of the RF current is directed to be in substantially different locations within the first and second conductive elements.
    Type: Grant
    Filed: May 20, 1999
    Date of Patent: September 4, 2001
    Assignee: Motorola, Inc.
    Inventors: John Douglas Reed, Steven Thomas Dunbar