US 6,388,633 B1 · Multibeam antenna

Abstract

When a converter 14 is rotated via a rotation mechanism 17, the arrangement inclination angle of two primary radiators 15a and 16b can be adjusted in the range of 0 to 20 deg. with respect to an axis which is in parallel with the ground. Also the reception polarization angle due to probes of the primary radiators 15a and 15b can be adjusted in the range of 0 to 20 deg. while maintaining a preset difference in polarization angle among the satellites. Therefore, the arrangement inclination angle of the primary radiators 15a and 16b for respectively receiving signals from the two satellites, and the reception polarization angle in the primary radiators 15a and 15b can be simultaneously easily adjusted by rotating the converter 14 via the rotation mechanism 17.

Claims14

Dependent claims

A primary radiator for a small-diameter multibeam antenna for receiving microwaves from geostationary satellites separated from each other by four degrees of elongation, comprising:

plural adjacent primary radiator apertures for receiving microwaves having wavelengths in the same band, each aperture provided with an outer peripheral wall;
and
at least two walls having the same height, which are disposed so as to commonly surround on said plural apertures,
wherein the at least two walls define therebetween a choke having a depth of about one quarter of a center wavelength of said received microwaves in said band;
and
wherein a height of the outer peripheral wall of each aperture is equal to or less than the height of said at least two walls.

3 more elements

Dependencies are inferred from the claim text.

Multibeam antenna

Life of this patent

Multibeam antenna

Life of this patent

Abstract

Claims14