Mr. Glenn A. Reynolds Profile

Glenn A. Reynolds

President at Gossamer Space Frames

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Proceedings Article | 29 September 2004 Paper

Co-axial joint technology applied to antenna backup structures

Glenn Reynolds, V. Feria, Gary Curtis, Dean Hackbarth, Asim Sehic

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.551740

KEYWORDS: Antennas, Bridges, Reflectors, Connectors, Tolerancing, 3D modeling, Assembly tolerances, Manufacturing, Microwave radiation, Space telescopes

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The increasing demand to improve focusing accuracy and to accommodate higher frequencies in space communications and radio astronomy has created significant challenges for improving the capability of the constituent systems in radio antennas and telescopes. One important system is the radio antenna/telescope backup structure connections. The backup structure is a key element in providing a stable, precise and rigid support for the reflective surface. The ideal connection for these types of structures is rigid and concentric resulting in minimal deformation with stress/strain curves that are linear, repeatable and exhibiting no hysteresis over the entire service load range. Conceivably such a connection could be designed so that the stress/strain curve mimics the stress/strain characteristics of the connecting member in both tension and compression. When this is achieved then such joints can be said to be "invisible" in the global behavior of the backup structure. At that point, overall reflector deflection becomes more linear and highly predictable. In conjunction with this advantage, optimized backup structure geometries, adaptive reflectors and compensating algorithms can best be applied in producing an instrument of unparalleled performance. This paper introduces Co-Axial Joint (CAJ) technology as the practical and economical means to produce an invisible connection.

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