Patents by Inventor Maria C. R. Carvalho

Maria C. R. Carvalho 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).

  • Impedance-matching coupler
    Patent number: 5200719
    Abstract: A coupling device has a dielectric substrate with at least two joined transmission lines formed thereon. The two transmission lines have a common signal carrying conductor and separate ground plane conducting means. The conductor cross-section and the conductor spacing cross-section are varied along the length of the transmission lines to provide a large change of the characteristic impedance of the coupling device along the line length.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: April 6, 1993
    Assignee: Telecommunicacoes Brasileiras S/A
    Inventors: Walter Margulis, Maria C. R. Carvalho