Patent ID: 6686891
Filing Date: 2004-02-03
Classification: H01Q

Abstract:
An antenna waveguide feed for a parabolic reflector comprising an input and an output portion,said input portion of the waveguide being tapered in the direction of signal travel from a maximum cross-sectional area to about one half of the maximum cross-sectional area to thereby reduce interference of the signal directed to and reflected from the reflector, and then gradually increasing in cross-sectional area to said maximum cross-sectional area to thereby improve the impedance match between said input and output portions; and said output portion joining said input portion and directing the received signal to the parabolic reflector, said output portion including a plurality of generally U-shaped channels each having a choke intermediate the length thereof to thereby generate an enhanced radiation pattern and a tongue at the free end thereof to thereby improve the impedance match between the output section and free space.