Multi-feed multi-band antenna
First Claim
1. A multi-feed, multi-band antenna comprising:
- a parabolic dish reflector having a boresight;
a plurality of antenna feeds, at least one of the plurality of antenna feeds being a four-port feed; and
a mounting structure mounting the plurality of antenna feeds adjacent the parabolic dish and constructed to position the plurality of antenna feeds relative to the parabolic dish reflector at different positions in a line and two degrees apart, the different positions including one of the boresight and positions adjacent the boresight, and the mounting structure being constructed to mount the four-port feed at one of the different positions with two of the plurality of antenna feeds mounted adjacent to and on opposite sides of the four-port feed and two degrees from the four-port feed.
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Abstract
A multi-feed, multi-band antenna includes a parabolic dish reflector, a plurality of four-port feeds, and may also include one or more orthomode two-port feeds. Each four-port feed is constructed to conduct multiple frequency bands and multiple polarized RF signals within each of the bands. A mounting structure mounts each of the feeds at a different position in a line and in a plane parallel to the rim of the reflector. The four-port feeds are of a size which allows them to be mounted adjacent each other and two degrees apart. The mounting structure positions the feeds at a distance F from the reflector. The diameter D of the reflector and the distance F have a relationship such that F/D is less than approximately 0.5.
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Citations
27 Claims
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1. A multi-feed, multi-band antenna comprising:
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a parabolic dish reflector having a boresight;
a plurality of antenna feeds, at least one of the plurality of antenna feeds being a four-port feed; and
a mounting structure mounting the plurality of antenna feeds adjacent the parabolic dish and constructed to position the plurality of antenna feeds relative to the parabolic dish reflector at different positions in a line and two degrees apart, the different positions including one of the boresight and positions adjacent the boresight, and the mounting structure being constructed to mount the four-port feed at one of the different positions with two of the plurality of antenna feeds mounted adjacent to and on opposite sides of the four-port feed and two degrees from the four-port feed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A multi-feed, multi-band antenna comprising:
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a parabolic dish reflector having a boresight and a diameter D;
a plurality of four-port feeds, each feed being constructed to conduct multiple frequency bands and multiple polarized radio frequency signals within each of the multiple frequency bands; and
a mounting structure mounting the plurality of four-port feeds adjacent the parabolic dish and constructed to position each of the plurality of feeds at different positions in a line two degrees apart relative to the parabolic dish reflector and at approximately a distance F from the parabolic dish reflector, the diameter D and the distance F having a relationship such that F/D is less than approximately 0.5. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A multi-feed, multi-band antenna comprising:
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a parabolic dish reflector having a boresight and a diameter D at a rim of the parabolic dish reflector;
a plurality of four-port feeds, each feed being constructed to conduct multiple frequency bands and multiple polarized radio frequency signals within each of the multiple frequency bands, and each of the plurality of four-port feeds having an aperture with a size designed to maximize a signal-to-noise ratio in the antenna; and
a mounting structure mounting the plurality of four-port feeds adjacent the parabolic dish and constructed to define a plurality of positions lying approximately in a plane parallel to the rim of the parabolic dish reflector, the plurality of positions including positions in a line and two degrees apart, the mounting structure mounting each of the plurality of feeds at different positions of the plurality of positions relative to the parabolic dish reflector and at approximately a distance F from the parabolic dish reflector, the diameter D and the distance F having a relationship such that F/D is less than approximately 0.5. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification