E-plane flared rectangular corrugated horn for tapered aperture

A flared rectangular horn is corrugated along the E-plane flaring walls. The corrugations are in the form of rectangular grooves parallel to the horn axis. The depths of the grooves are optimized to produce the tapered aperture that is needed for certain radiation pattern requirements. Two designs are presented in this paper. The first design is for a narrow beam and low sidelobes in the E-plane pattern. The second design is for equal patterns in the E- and H-planes. The choice of the flaring function determines the E-plane radiation pattern. A linear flaring is chosen for the narrow beam and an exponential flaring is chosen for the equal E- and H-plane patters.