30 January 2004 Design and test of a 2m x 4m DART system in the RF
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Abstract
A 2-meter by 4-meter aperture DART (dual anamorphic reflector telescope) system has been designed and fabricated using thin stretched mesh reflectors. The system concept consists of a pair of single curvature reflectors with curvature in orthogonal directions relative to each other and is being developed for future ultra-lightweight space applications. The current design is an extension of a 1-meter aperture system previously prototyped and successfully tested in the FarIR. The 2m x 4m system is a laboratory prototype with areal density of less than 10kg/m2 for each reflector. The new design demonstrates the advantageous scaling properties of the single curvature reflector concept. The 2m x 4m system was configured and tested in the RF over several frequencies from 5.8 - 8.2 GHz. This paper documents the structural configuration, test preparation, test results, and analysis correlation. Test results show the DART system to be a high directivity antenna (46.5 dB), very low cross-polarization (-33 dB), and good off-axis properties. Test results were in good agreement with analytical predictions of the performance. Generally, the DART system easily achieves the surface accuracy requirements at 8.2 GHz.
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Jason Tolomeo, Jay Loane, Domenick J. Tenerelli, Eugene W. Cross, William W. Sable, Tom Decker, Kin Chan, Tom Nelson, Bill Joseph, Connor Windes, Doug Kokawa, Alex Kamis, Mark Dragovan, Jennifer A. Dooley, "Design and test of a 2m x 4m DART system in the RF", Proc. SPIE 5166, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts, (30 January 2004); doi: 10.1117/12.506656; https://doi.org/10.1117/12.506656
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