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1.2 Meter Shielded Cassegrain Antenna for Close-Packed Radio Interferometer

arXiv.org, 2010-12

2010. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;http://arxiv.org/licenses/nonexclusive-distrib/1.0 ;EISSN: 2331-8422 ;DOI: 10.48550/arxiv.1012.3899

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Title:
1.2 Meter Shielded Cassegrain Antenna for Close-Packed Radio Interferometer
Author: Koch, Patrick M ; Raffin, Philippe ; Yau-De, Huang ; Ming-Tang, Chen ; Chih-Chiang, Han ; Kai-Yang, Lin ; Altamirano, Pablo ; Granet, Christophe ; Ho, Paul T P ; Huang, Chih-Wei L ; Kesteven, Michael ; Chao-Te, Li ; Yu-Wei, Liao ; Guo-Chin, Liu ; Nishioka, Hiroaki ; Ching-Long, Ong ; Oshiro, Peter ; Umetsu, Keiichi ; Fu-Cheng, Wang ; Wu, Jiun-Huei Proty
Subjects: Aluminum ; Antenna arrays ; Antennas ; Big Bang theory ; Cassegrain antennas ; Cosmic microwave background ; Finite element method ; Galactic clusters ; Galaxies ; Gaussian beams (optics) ; Physics - Cosmology and Nongalactic Astrophysics ; Physics - Instrumentation and Methods for Astrophysics ; Radio interferometers ; Shielding ; Sidelobes ; Thermal analysis ; Weight
Is Part Of: arXiv.org, 2010-12
Description: Interferometric millimeter observations of the cosmic microwave background and clusters of galaxies with arcmin 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 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 feedhorn antenna simulations and verified in a far field beam pattern measurement. A shielding baffle reduces inter-antenna coupling to below \(\sim\) -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 per year is anticipated in a 13-element array operation.
Publisher: Ithaca: Cornell University Library, arXiv.org
Language: English
Identifier: EISSN: 2331-8422
DOI: 10.48550/arxiv.1012.3899
Source: Freely Accessible Journals
arXiv.org
ROAD: Directory of Open Access Scholarly Resources
ProQuest Central

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1.2 Meter Shielded Cassegrain Antenna for Close-Packed Radio Interferometer

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