Abstract: A slot array antenna includes a waveguide slot body and a dielectric slab. The waveguide body includes one or more walls that define a waveguide aperture, the waveguide aperture extending along a longitudinal axis of the waveguide slot body. The waveguide slot body includes a plurality of slots disposed on one or more walls of the waveguide slot body. The dielectric slab is disposed within the waveguide aperture and extends along the longitudinal axis of the waveguide slot body. The dielectric slab is rotatable about the longitudinal axis within the waveguide aperture.

Abstract: A ridged waveguide slot array includes a waveguide slot body having one or more walls that define a longitudinal axis of the waveguide slot body. The waveguide slot body includes a narrowed waveguide section having a plurality of slots disposed thereon which extend along the longitudinal axis, the waveguide slot body further characterized by a longitudinal center line. The waveguide slot body defines a waveguide aperture having a major dimension and a minor dimension, wherein the major dimension of the waveguide aperture is less than one-half wavelength of a signal intended for propagation therein. Each slot of the plurality of slots is characterized by a slot area, a slot offset distance that extends from the center of the slot to the longitudinal center line, and a slot-to-slot separation distance extending from the center of the slot to the center of an adjacent slot.