Patents by Inventor Ralph Riojas

Ralph Riojas 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).

  • Cylindrical continuous-slot antenna made from discrete wrap-around antenna elements
    Patent number: 11489267
    Abstract: An omnidirectional vertically polarized antenna. A number of antenna elements are each fabricated on a backing, such as a printed circuit board. The front of each antenna element has conductive strips and slots, arranged in an alternating pattern. The back of each antenna element has an antenna feed circuit. An electrically absorptive layer is attached to the back of each antenna element. The antenna elements are assembled together in a nonconductive housing with circumferentially arranged compartments that receive the antenna elements.
    Type: Grant
    Filed: June 7, 2021
    Date of Patent: November 1, 2022
    Assignee: Southwest Research Institute
    Inventors: Patrick Siemsen, Ralph Riojas