PURPOSE: To almost make the beam directions equal, by taking the wave plane of spherical waves radiated from the horn used at lower frequency bands as almost circular cone waves.
CONSTITUTION: After spherical waves radiated from the horn used at lower frequency bands among a plurality of horns are reflected at the reflection mirror, the shape of the mirror surface M is determined so that the wave plane W0 is almost circular cone wave, the center direction of the wave surface is taken as the antenna reference direction. Inversely, the horn H1 is located on the line C1 on which the wave plane is strongly concentrated when plane waves are incident to the mirror surface from the antenna reference direction, so that the center of phase of horns used at other frequency bands is in coincidence, and the center axis of horns used at high frequencies is directed to the direction F0M0 where the reception level by each horn is maximum.
KATAKI TAKASHI
URASAKI SHIYUUJI
