Patent ID: 6700549
Filing Date: 2004-03-02
Classification: H01Q

Abstract:
An apparatus for feeding electromagnetic energy, the apparatus comprising:a waveguide for carrying electromagnetic energy; an aperture located at an exit end of the waveguide, the aperture for producing electromagnetic enemy in the form of an electric (E) field and a magnetic (H) field, with at least one dimension of the aperture being chosen to correspond to a desired beamwidth for one of the resulting E- or H-fields; a dielectric fill section within the waveguide, with electromagnetic propagation properties of the dielectric fill section being chosen according to a desired cutoff frequency of the electromagnetic energy radiated by the feed; an input waveguide section, for carrying electromagnetic energy to the feed; and an input transformer, coupled to an end of the waveguide in the feed opposite the exit end, the input transformer for matching the electromagnetic properties of the dielectric section of the feed to that of the input waveguide.