Patents Assigned to Thorm EMI plc
  • Patent number: 4958165
    Abstract: An element which acts as an antenna and circular-polarizer for the domestic reception of DBS signals has a front plate of aluminum alloy, with two slots and of differing length and orthogonally crossing at their midpoints. The width and length of slots and are chosen in order to provide equal power flow through the slots and adequate bandwidth appropriate to the format of the DBS frequency band.Behind the plate the element has a rectangular housing to form a cavity containing a suspended strip line with a support whose free end is located below the point of crossing the two slots, and which extends outwardly therefrom in a straight line bisecting the angle formed by adjacent arms of the slots and being in a plane parallel to the plate.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: September 18, 1990
    Assignee: Thorm EMI plc
    Inventors: Walter J. Axford, Satwinder S. Chana