Multibeam antenna
View Patent ↗When a converter 14 is rotated via a rotation mechanism 17 , the arrangement inclination angle of two primary radiators 15 a and 15 b 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 15 a and 15 b 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 15 a and 15 b for respectively receiving signals from the two satellites, and the reception polarization angle in the primary radiators 15 a and 15 b can be simultaneously easily adjusted by rotating the converter 14 via the rotation mechanism 17.
1. A primary radiator for a multibeam antenna for receiving micro waves from geostationary satellites, comprising:
plural adjacent primary radiator aperture 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 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 not greater than the height of the at least two surrounding walls.
2. The primary radiator according to claim 1 , further comprises dielectric members disposed in each of said primary radiator apertures for focusing said microwaves therein.
3. The primary radiator according to claim 1 , further comprises helical antennas disposed in each of said primary radiator apertures.
4. A converter for receiving microwaves from satellites, wherein the primary radiators according to claim 1 is integrated with a main unit of said converter.
5. A converter for receiving microwaves from satellites, wherein the primary radiator according to claim 2 is integrated with a main unit of said converter.
6. A converter for receiving microwaves from satellites, wherein the primary radiator according to claim 3 is integrated with a main unit of said converter.
7. A primary radiator for a multibeam antenna for receiving micro waves from geostationary satellites, comprising:
plural adjacent primary radiator apertures for receiving microwaves having wavelengths in the same band, each aperture provided with an outer peripheral wall having a first height of about one quarter of a center wavelength of said received microwaves in the band; and
a wall member having the first height, which is disposed so as to commonly surround said plural apertures.
8. The primary radiator according to claim 7 , further comprises dielectric members disposed in each of said primary radiator apertures for focusing said microwaves therein.
9. The primary radiator according to claim 7 , further comprises helical antennas disposed in each of said primary radiator apertures.
10. A converter for receiving microwaves from satellites, wherein the primary radiator according to claim 7 is integrated with a main unit of said converter.
11. A converter for receiving microwaves from satellites, wherein the primary radiator according to claim 8 is integrated with a main unit of said converter.
12. A converter for receiving microwaves from satellites, wherein the primary radiator according to claim 9 is integrated with a main unit of said converter.