An Annular Corrugated-Surface Antenna

The far-zone pattem of the symmetrically excited annular corrugated-surface antenna is shown to be uniform in the azimuthal direction and polarized in a direction perpendicular to the antenna surface, and to have the major lobe directed slightly above the plane of the antenna. An analysis of the antenna immersed in an infinite ground plane is presented and compared with experimental results on the antenna in a finite ground plane.