Nomographs for phase centers of conical corrugated and TE11mode horns

Practical and convenient monographs, for obtaining the phase centers of corrugated conical horns and conical horns excited in TE
11
mode, are presented. Given the length of horn, the radius of aperture, and the distance from aperture to observation point along the horn axis, the location of the phase center can be directly found on these nomographs.