03949404 is referenced by 90 patents and cites 2 patents.

In a horn-reflector antenna system for producing a spherical aperture phase front, a corrugated conical horn illuminates a section of a hyperbolic reflector to produce a spherical aperture phase front which produces a far-field beam with low sidelobes and high beam efficiency. The system is insensitive to frequency and polarization changes, and is also insensitive to orientation about the axis of the conical horn for beam scanning.

Title
Highly efficient antenna system using a corrugated horn and scanning hyperbolic reflector
Application Number
5/534265
Publication Number
3949404
Application Date
December 19, 1974
Publication Date
April 6, 1976
Inventor
Kenneth A Green
Andover
MA, US
James C Administrator of the National Aeronautics and Space Administration with respect to an invention of Fletcher
Andover
MA, US
Agent
John R Manning
Paul F McCaul
Monte F Mott
IPC
H01Q 15/16
H01Q 13/02
View Original Source