Patent ID: 6130649
Filing Date: 2000-10-10
Classification: H01P

Abstract:
A polarizer for exciting the parabolic reflector of a directional antenna, comprising:(a) a profile section which is formed as a waveguide and adapted to simultaneously transmit first and second linearly orthogonally polarized electromagnetic waves, the profile section having first and second openings therein;(b) a short-circuit element disposed in the profile section between the first and second openings;(c) a first transition section communicating with the first opening of the profile section, the first transition section defining a first cavity with a generally rectangular cross-section, and having two opposing mutually aligned ribs which extend in an axial direction of the first cavity and project from wider walls of the first cavity;(d) a first rectangular waveguide electromagnetically connected to the first opening of the profile section by the first transition section to guide the first electromagnetic wave, wherein an end of the first rectangular waveguide is connected to a side wall of the profile section in a radial orientation;(e) a second transition section communicating with the second opening of the profile section and being positioned at a front end of the profile section, the second transition section being formed with a plurality of steps and defining a second cavity with a generally rectangular cross-section; and(f) a second rectangular waveguide electromagnetically connected to the second opening of the profile section by the second transition section to guide the second electromagnetic wave, wherein an end of the second rectangular waveguide is connected to the second transition section, and a center axis of the second rectangular waveguide coincides with a center axis of the profile section.