Patents by Inventor Rene Le Dain

Rene Le Dain 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).

  • Wide band directional coupler for microstrip lines
    Patent number: 4677399
    Abstract: A wide band directional coupler for microstrip lines has a microstrip line ection whose conductive core is coupled to the core of the main line over a length .lambda./4 (.lambda. being the wave length in a mid portion of the desired pass band). The section has a first fraction parallel to the main line and at a small distance therefrom so as to provide tight coupling and a second fraction diverging from the main line and closed on a matching impedance. The free end of the first fraction is connected to the load and has an extension projecting over a length less than .lambda./16 for forming a microcapacitor tapping energy from the main line.
    Type: Grant
    Filed: April 25, 1986
    Date of Patent: June 30, 1987
    Assignees: Etat Francais represente par le Ministre des PTT (Centre National d'Etudes des Telecommunications), Etablissement Public de Telediffusion dit "Telediffusion de France"
    Inventors: Rene Le Dain, Henri Havot