Patents by Inventor Yasufumi Siomi

Yasufumi Siomi 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 waveguide-to-microstrip line converter
    Patent number: 5280253
    Abstract: A microwave circuit includes a concentric-circle-like prominence (7) formed on a contact surface which is on the side of a metal body (3) serving as an external conductor of a coaxial line and which connects a conductor strip (1) of an MSL formed on a dielectric substrate (2) to an internal conductor of the coaxial line through a through-hole (9) extending from a ground plane (11) of the MSL through the dielectric substrate (2). The construction involves no mismatched portion and can prevent a loss and deterioration in VSWR in the coaxial-line/MSL conversion section, thereby making it possible to obtain satisfactory characteristics.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: January 18, 1994
    Assignee: Matsushita Electric Industrial Co. Ltd.
    Inventors: Akihito Deki, Yukiro Kashima, Kazuyoshi Nishioka, Shozo Aono, Akira Kinoshita, Yasufumi Siomi