Abstract
We have proposed an ultra-light reflector antenna whose aperture diameter is larger than 20m and whose weight is less than 80kg. Our target is an areal density of 0.25kg/m2 or less. To realize this new reflector antenna, we propose a geodesic cable network system supported by a tendon-reinforced structure. To confirm this concept, we fabricated and tested a scale model of the support structure. The scale model, which is around 3m in diameter and deployable, consists of spoke-wise framing, tendon cables and dummy tension cables. Static load responses were measured by using strain gauges and load cells. Deformation modes were also captured by a videogrametry system. We can conclude that the tendon-reinforced deployable frame structure can support six times the tension possible with the bare structure, and analytical results show good agreement with experimental results by considering the initial imperfection in the scale model.
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