Apparatus for coupling coaxial transmission line to rectangular waveguide

Claim 1

In combination with a coaxial transmission line, having an outer conductor and a center conductor, and a rectangular waveguide, having a first axis parallel to the narrow sides of said waveguide and a second axis parallel to the wide sides of said waveguide, said first and second axes being mutually perpendicular and perpendicular to the direction of propagation of microwave energy through said waveguide, an improved apparatus for coupling microwave energy from said coaxial transmission line to said waveguide and vice versa, said improved apparatus comprising: a. a cover on one end of said waveguide, said cover including a conductive material and having an opening for receiving said center conductor of said coaxial transmission line and having means for conductively connecting said outer conductor of said coaxial transmission line to said conductive material of said cover; b. a conductive mass positioned within said waveguide, said conductive mass being spaced from the walls of said waveguide and from said cover, said center conductor of said coaxial transmission line being in electrically conductive relation with said conductive mass; and c. a hook-shaped conductive element having first and second ends, said first end being in electrically conductive relation with said conductive mass, said second end terminating within said waveguide at a location spaced from the walls thereof and at a location spaced from said cover, said hook-shaped conductive element having a curvature between its first and second ends that is in a plane that is parallel with said first axis of said waveguide.