Space Inflatables > Space Deployable Inflatable Antennas > 1m X-Band Reflectarray Program Goals & Requirements 1 meter aperture X-Band (8.4GHz) Circularly polarized Low Mass (less than 1 kg) ±1.25mm flatness deviation Membrane spacing 1.25mm ±0.12mm Center feed horn ±13mm from center 50 Inflations Design Notes Foam DOTS (extremely low compression set) allowed folding of membrane Holes punched at tri-corner folds to relive stress in membrane Frame utilized all soft joints Tensioned "catenary" to distribute membrane loads Tensioning membrane adjustable to ‘tune’ system Relief valve prevents over pressurization Test Results & Lessons Learned - 3dB beam width of 2.40 (as expected) Peak sidelobe of -18dB (higher than expected) Peak cross-pol level at -18dB (higher than expected) Efficiency of 37% Improvements can be made: Assembly of membrane strips Effects due to folding Contiguous ground plane Test Set-up

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