Patent ID: 7339541

Claim:
An antenna system, comprising: a cavity-backed broadside radiating waveguide, wherein the cavity-backed waveguide is a boxlike structure having a first side and a second side that are parallel to one another, a third side and a fourth side that are parallel to one another, a closed end, and an open end, and wherein the cavity is the interior volume formed by the sides and the closed end of the waveguide; a center conductor of a coaxial feed protruding through a side wall of the waveguide and into the cavity of the waveguide, wherein the side wall is any of the first, second, third, and fourth sides of the waveguide; and a radiating disc element having an axis of rotational symmetry substantially perpendicular to the side wall of the waveguide, wherein the radiating disk element is affixed to the center conductor, and wherein a position of the radiating disc element on the center conductor is adjustable.