Satellite antenna
An antenna includes ribs that have been folded to fit within a frame, a conductive mesh coupled to the ribs, an arm that has been folded to fit within the frame, and a feed disposed at a distal end of the arm.
1. An apparatus comprising a frame and an antenna, said antenna comprising ribs that have been folded to fit within said frame, a conductive mesh coupled to said ribs, an arm that has been folded to fit within said frame, and a feed disposed at a distal end of said arm, wherein said feed comprises a dielectric in contact with first and second conductive paths, wherein said arm comprises a proximal segment having a cradle formed therein for receiving said feed.
2. The apparatus of claim 1 , wherein said first and second conductive paths define first and second spirals.
3. The apparatus of claim 1 , wherein said conductive paths have constant width.
4. The apparatus of claim 1 , wherein said arm comprises a distal segment and a proximal segment, said distal end being an end of said distal segment, and wherein said arm further comprises a joint between said distal and proximal segments.
5. The apparatus of claim 1 , wherein said arm comprises at least three segments and at least three joints, said joints being disposed to permit articulation of segments relative to each other.
6. The apparatus of claim 1 , wherein, when deployed, said arm holds said feed at a focus of a paraboloid formed by said mesh.
7. The apparatus of claim 1 , wherein said arm, when deployed, is a cantilevered arm.
8. The apparatus of claim 1 , wherein said arm comprises a first segment and a second segment, wherein said second segment is closer to said distal tip than said first segment once said arm has been unfolded, and wherein said second segment is narrower than said first segment.
9. The apparatus of claim 1 , wherein each rib comprises a tip segment, a root segment, and a hinge between said root segment and said tip segment, wherein said the tip segment includes a distal tip of said rib, and wherein said root segment is attached to a pusher plate to which all of said ribs are mounted.
10. The apparatus of claim 9 , wherein said hinge couples said root segment to said tip segment.
11. The apparatus of claim 1 , further comprising a pusher plate, wherein each of said ribs comprises a root segment that is connected to said pusher plate by a corresponding hinge.
12. The apparatus of claim 1 , further comprising a satellite, wherein said antenna and frame are constituent parts of said satellite.
13. The apparatus of claim 1 , further comprising a satellite network, wherein said antenna and frame are constituent parts of a satellite of said satellite network.
14. The apparatus of claim 1 , wherein said mesh comprises gold-coated tungsten.
15. The apparatus of claim 1 , wherein said mesh comprises gold-coated molybdenum.
16. A method comprising deploying an antenna on a satellite, wherein deploying said antenna comprises causing a multi-segment arm to emerge from a frame, unfolding said multi-segment arm, causing a feed at a distal tip of said arm to be held away from said frame, wherein said arm comprises a proximal segment having a cradle formed therein for receiving said feed, causing a plurality of ribs to emerge from said frame, causing a mesh connected to said ribs to form a paraboloidal surface having a focus that coincides with a location of said feed.
17. The method of claim 16 , further comprising using said antenna to establish communication with a satellite network of which said satellite is a constituent part.