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DTSTAMP:20230925T143742Z
UID:7ECA7135-2378-43C2-A39D-048EFC285D74
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DESCRIPTION:THIS CHAPTER MEETING HAS BEEN CHANGED TO VIRTUAL ONLY!\n\nLarge
  reflectors in space (>30 m diameter) can enable advances in communication
 s\, remote sensing\, and astronomy\, by enabling antennas with increased g
 ain\, resolution\, and bandwidth. However\, modern deployable reflectors e
 xhibit a decrease in performance as their diameter increases\, due to fabr
 ication errors\, slewing\, and disturbances on orbit\, such as thermal dis
 tortion\, which decrease surface precision. A potential solution to achiev
 e larger apertures with high precision is to combine in-space manufacturin
 g (ISM) with active control. Herein we demonstrate a reflector concept whi
 ch combines a candidate ISM process called Bend-Forming with electrostatic
  actuation to achieve closed-loop control of the reflector surface. We des
 ign and fabricate a 1-meter diameter prototype of an electrostatically act
 uated X-band reflector\, using a knitted gold-molybdenum mesh as the refle
 ctor surface\, carbon fiber-reinforced plastic booms as electrodes\, and a
  truss support structure fabricated with Bend-Forming (a deformation proce
 ss for constructing trusses from wire feedstock). To characterize the perf
 ormance of this prototype\, we measure its radiation patterns at X-band in
  an RF anechoic chamber. We successfully demonstrate 1) the stabilization 
 of a pull-in instability with closed-loop control\, and 2) beam steering o
 f up to 4.2 degrees with asymmetric electrostatic actuation. Our reflector
  prototype highlights the opportunities of implementing electrostatically-
 actuated reflector antennas in space.\n\nCo-sponsored by: Life Members\n\n
 Speaker(s): Zack Cordero\n\nVirtual: https://events.vtools.ieee.org/m/3648
 69
LOCATION:Virtual: https://events.vtools.ieee.org/m/364869
ORGANIZER:cara.kataria@ll.mit.edu
SEQUENCE:26
SUMMARY:In-Space Manufacturing of Large Electrostatically Actuated Mesh Ref
 lectors 
URL;VALUE=URI:https://events.vtools.ieee.org/m/364869
X-ALT-DESC:Description: <br /><p><em><strong>THIS CHAPTER MEETING HAS BEEN 
 CHANGED TO VIRTUAL ONLY!&nbsp\; &nbsp\;</strong></em></p>\n<p>Large reflec
 tors in space (&gt\;30 m diameter) can enable advances in communications\,
  remote sensing\, and astronomy\, by enabling antennas with increased gain
 \, resolution\, and bandwidth. However\, modern deployable reflectors exhi
 bit a decrease in performance as their diameter increases\, due to fabrica
 tion errors\, slewing\, and disturbances on orbit\, such as thermal distor
 tion\, which decrease surface precision. A potential solution to achieve l
 arger apertures with high precision is to combine in-space manufacturing (
 ISM) with active control. Herein we demonstrate a reflector concept which 
 combines a candidate ISM process called Bend-Forming with electrostatic ac
 tuation to achieve closed-loop control of the reflector surface. We design
  and fabricate a 1-meter diameter prototype of an electrostatically actuat
 ed X-band reflector\, using a knitted gold-molybdenum mesh as the reflecto
 r surface\, carbon fiber-reinforced plastic booms as electrodes\, and a tr
 uss support structure fabricated with Bend-Forming (a deformation process 
 for constructing trusses from wire feedstock). To characterize the perform
 ance of this prototype\, we measure its radiation patterns at X-band in an
  RF anechoic chamber. We successfully demonstrate 1) the stabilization of 
 a pull-in instability with closed-loop control\, and 2) beam steering of u
 p to 4.2 degrees with asymmetric electrostatic actuation. Our reflector pr
 ototype highlights the opportunities of implementing electrostatically-act
 uated reflector antennas in space.</p>
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