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1.2 m Shielded Cassegrain Antenna for Close-Packed Radio Interferometer

Patrick M. Koch, Philippe Raffin, Yau-De Huang, Ming-Tang Chen, Chih-Chiang Han, Kai-Yang Lin, Pablo Altamirano, Christophe Granet, Paul T. P. Ho, Chih-Wei L. Huang, Michael Kesteven, Chao-Te Li, Yu-Wei Liao, Guo-Chin Liu, Hiroaki Nishioka, Ching-Long Ong, Peter Oshiro, Keiichi Umetsu, Fu-Cheng Wang and Jiun-Huei Proty Wu
Publications of the Astronomical Society of the Pacific
Vol. 123, No. 900 (2011 February), pp. 198-212
DOI: 10.1086/658675
Stable URL: http://www.jstor.org/stable/10.1086/658675
Page Count: 15
Subjects: Astronomy
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Abstract

ABSTRACT. Interferometric millimeter observations of the cosmic microwave background and clusters of galaxies with arcminute resolutions require antenna arrays with short spacings. Having all antennas co-mounted on a single steerable platform sets limits to the overall weight. A 25 kg lightweight novel carbon-fiber design for a 1.2 m diameter Cassegrain antenna is presented. The finite element analysis predicts excellent structural behavior under gravity, wind, and thermal load. The primary- and secondary-mirror surfaces are aluminum-coated with a thin TiO2 TiO 2 top layer for protection. A low beam sidelobe level is achieved with a Gaussian feed-illumination pattern with edge taper, designed based on feed-horn antenna simulations and verified in a far-field beam-pattern measurement. A shielding baffle reduces interantenna coupling to below ∼-135 dB ∼ - 135     dB . The overall antenna efficiency, including a series of efficiency factors, is estimated to be around 60%, with major losses coming from the feed spillover and secondary blocking. With this new antenna, a detection rate of about 50 clusters yr-1 50     clusters     y r - 1 is anticipated in a 13-element array operation.

Notes and References

This item contains 45 references.

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