A millimeter wave receiving antenna with an omnidirectional or directional scannable azimuth pattern and a directional vertical pattern

A millimeter wave receiving antenna capable of providing either 1) an omnidirectional azimuthal and a directional vertical pattern or 2) a directional azimuthal pattern capable of being scanned when it is used to illuminate a parabolic cylinder is described. The antenna consists of a modified dielectric rod antenna fed from a circular waveguide operating in the
TE_{01}
mode.