Patents Assigned to Microwave and Electronic Systems Ltd.
  • Patent number: 4005375
    Abstract: A radio frequency coupling device has a non-magnetic, dielectric substrate having a planar surface on which a ferrimagnetic disc-shaped film is epitaxially grown. Sections of surface-oriented transmission line such as coplanar waveguide or slot-line extend over the substrate surface and terminate over the disc. The ferrimagnetic material couples to the RF magnetic fields associated with the transmission line sections and provides a coupling therebetween which is tunable by adjusting a direct magnetic field applied to the disc. Low direct coupling between the sections is obtained by arranging their respective RF magnetic fields to be orthogonal at the disc.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: January 25, 1976
    Assignee: Microwave and Electronic Systems Ltd.
    Inventors: Robert D. Pringle, Ian F. Morton