Multi-band satellite antenna assembly with dual feeds in a coaxial relationship and associated methods
View Patent ↗An antenna assembly includes a main reflector, and a subreflector spaced from the main reflector. The subreflector includes a frequency selective surface (FSS) material that is transmissive for a first frequency band and reflective for both a second frequency band and a third frequency band. A first antenna feed is adjacent the subreflector and is directed toward the main reflector. The first antenna feed is for the first frequency band. Second and third antenna feeds are arranged in a coaxial relationship adjacent the main reflector and are directed toward the subreflector. The second and third antenna feeds are for the second and third frequency bands, respectively.
1. An antenna assembly comprising:
a main reflector;
a subreflector spaced from said main reflector and comprising a frequency selective surface (FSS) material that is transmissive for a first frequency band and reflective for both a second frequency band and a third frequency band;
a first antenna feed adjacent said subreflector and directed toward said main reflector, said first antenna feed for the first frequency band; and
second and third antenna feeds arranged in a coaxial relationship adjacent said main reflector and directed toward said subreflector, said second and third antenna feeds for the second and third frequency bands, respectively.
2. The antenna assembly according to claim 1 wherein said first antenna feed comprises an antenna feed horn.
3. The antenna assembly according to claim 1 wherein said main reflector has a medial opening therein; and wherein said second and third antenna feeds extend through the medial opening.
4. The antenna assembly according to claim 1 wherein said second antenna feed comprises an elongated center conductor, and said third antenna feed comprises a series of stepped circular conductors surrounding and spaced apart from said elongated center conductor.
5. The antenna assembly according to claim 1 wherein the first frequency band comprises the Ka frequency band, the second frequency band comprises the Ku band, and the third frequency band comprises the C band.
6. The antenna assembly according to claim 1 wherein each of said first, second and third antenna feeds are operable for both transmit and receive.
7. The antenna assembly according to claim 1 wherein said first, second and third antenna feeds are simultaneously operable.
8. The antenna assembly according to claim 1 further comprising a rotatable base mounting said second and third antenna feeds.
9. The antenna assembly according to claim 1 further comprising a mounting plate mounting said first antenna feed, and a plurality of struts coupled between said mounting plate and said subreflector, with said first antenna feed positioned between said mounting plate and said subreflector.
10. The antenna assembly according to claim 1 further comprising a radome covering said main reflector and subreflector.
11. The antenna assembly according to claim 1 further comprising a stabilization platform coupled to said main reflector.
12. The antenna assembly according to claim 1 wherein said main reflector has a diameter in a range of 2 to 3 meters.
13. An antenna assembly comprising:
a main reflector;
a subreflector spaced from said main reflector and comprising a frequency selective surface (FSS) material that is transmissive for a first frequency band and reflective for both a second frequency band and a third frequency band;
a first antenna feed adjacent said subreflector and directed toward said main reflector, said first antenna feed for the first frequency band; and
second and third antenna feeds arranged in a coaxial relationship adjacent said main reflector and directed toward said subreflector, said second and third antenna feeds for the second and third frequency bands, respectively;
said first, second and third antenna feeds being simultaneously operable;
the first frequency band comprising the Ka frequency band, the second frequency band comprising the Ku band, and the third frequency band comprising the C band.
14. The antenna assembly according to claim 13 wherein said first antenna feed comprises an antenna feed horn.
15. The antenna assembly according to claim 13 wherein said main reflector has a medial opening therein; and wherein said second and third antenna feeds extend through the medial opening.
16. The antenna assembly according to claim 13 wherein said second antenna feed comprises an elongated center conductor, and said third antenna feed comprises a series of stepped circular conductors surrounding and spaced apart from said elongated center conductor.
17. The antenna assembly according to claim 13 wherein each of said first, second and third antenna feeds are operable for both transmit and receive.
18. The antenna assembly according to claim 13 further comprising a rotatable base mounting said second and third antenna feeds.
19. The antenna assembly according to claim 13 further comprising a mounting plate mounting said first antenna feed, and a plurality of struts coupled between said mounting plate and said subreflector, with said first antenna feed positioned between said mounting plate and said subreflector.
20. The antenna assembly according to claim 13 further comprising a radome covering said main reflector and subreflector.
21. The antenna assembly according to claim 13 further comprising a stabilization platform coupled to said main reflector.
22. The antenna assembly according to claim 13 wherein said main reflector has a diameter in a range of 2 to 3 meters.
23. A method for making an antenna assembly comprising:
positioning a subreflector spaced from a main reflector, the subreflector comprising a frequency selective surface (FSS) material that is transmissive for a first frequency band and reflective for both a second frequency band and a third frequency band;
positioning a first antenna feed so as to be directed toward the main reflector, with the first antenna feed adjacent the subreflector, the first antenna feed for the first frequency band; and
positioning second and third antenna feeds arranged in a coaxial relationship adjacent the main reflector so as to be directed toward said subreflector, the second and third antenna feeds for the second and third frequency bands, respectively.
24. The method according to claim 23 wherein the first antenna feed comprises an antenna feed horn.
25. The method according to claim 23 wherein the main reflector has a medial opening therein; and wherein the second and third antenna feeds extend through the medial opening.
26. The method according to claim 23 wherein the second antenna feed comprises an elongated center conductor, and the third antenna feed comprises a series of stepped circular conductors surrounding and spaced apart from the elongated center conductor.
27. The-method according to claim 23 wherein the first frequency band comprises the Ka frequency band, the second frequency band comprises the Ku band, and the third frequency band comprises the C band.
28. The method according to claim 23 wherein each of the first, second and third antenna feeds are operable for both transmit and receive.
29. The method according to claim 23 wherein the first, second and third antenna feeds are simultaneously operable.
30. The method according to claim 23 further comprising mounting the second and third antenna feeds to a rotatable base.
31. The method according to claim 23 further comprising mounting the first antenna feed to a mounting plate, coupling a plurality of struts between the mounting plate and the subreflector, with the first antenna feed positioned between the mounting plate and the subreflector.
32. The method according to claim 23 further comprising positioning a radome to cover the main reflector and subreflector.
33. The method according to claim 23 further comprising coupling a stabilization platform to the main reflector.