Patents Represented by Attorney, Agent or Law Firm Francis G. Montgomery
  • Multilayer microwave couplers using vertically-connected transmission line structures
    Patent number: 6208220
    Abstract: A microwave coupler is constructed in a multilayer, vertically-connected stripline architecture provided in the form of a microwave integrated circuit that has a homogeneous, multilayer structure. Such a coupler has a vertically-connected stripline structure in which multiple sets of stripline layers are separated by interstitial groundplanes, and wherein more than one set of layers has a segment of coupled stripline. A typical implementation operates at frequencies from approximately 0.5 to 6 GHz, although other frequencies are achievable.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: March 27, 2001
    Assignee: Merrimac Industries, Inc.
    Inventor: James J. Logothetis
  • Microwave mixer with baluns having rectangular coaxial transmission lines
    Patent number: 6204736
    Abstract: A double-balanced ring mixer is provided in the form of a microwave integrated circuit that has a homogeneous, multilayer structure. The mixer utilizes baluns comprising rectangular coaxial transmission lines that are capable of operating over a wide range of frequencies while taking up little space. A typical implementation operates at frequencies from approximately 0.9 to 6 GHz, although other frequencies, such as approximately 0.1 to 10 GHz, are achievable.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: March 20, 2001
    Assignee: Merrimac Industries, Inc.
    Inventor: James J. Logothetis