Patent ID: 6573873
Filing Date: 2003-06-03
Classification: H01Q

Abstract:
A horn antenna, comprising:an electrically conductive rectangular first waveguide portion defining a rectangular waveguide feed aperture and a second rectangular aperture which is larger than said feed aperture, at least in the H plane; an electrically conductive rectangular second waveguide portion defining a radiating aperture and a second aperture, said second aperture of said first waveguide portion being juxtaposed with said second aperture of said second waveguide portion with corresponding polarizations, said second aperture of said second waveguide portion being larger than said second aperture of said first waveguide portion in the H plane, and said second aperture of said second portion being identical in dimension to said second aperture of said first portion in the E plane, thereby defining an H-plane step in dimension, but not an E-plane step; electrically conductive means coupling the walls of said first and second waveguide portions at said H-plane step to thereby define complete H-plane walls extending from said feed aperture to said radiating aperture; and first and second dielectric slabs, each of said dielectric slabs lying against the H-plane walls of said second waveguide portion and extending from near said step to near said radiating aperture.