Cost Effective Frequency Ranges For Multi-Beam Dishes, Cylinders, Aperture Arrays, and Hybrids |
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| Authors: | Jaap D Bregman |
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| Institution: | (1) ASTRON, P.O. Box 2, 7990, AA, Dwingeloo, The Netherlands |
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| Abstract: | Five out of six Square Kilometre Array (SKA) science programs need extensive surveys at frequencies below 1.4 GHz and only four need high-frequency observations. The latter ones drive to expensive high surface accuracy collecting area, while the former ask for multi-beam receiver systems and extensive post correlation processing. In this paper, we analyze the system cost of a SKA when the field-of-view (Fov) is extended from 1 deg2 at 1.4 GHz to 200 deg2 at 0.7 GHz for three different antenna concepts. We start our analysis by discussing the fundamental limitations and cost issues of wide-band focal plane arrays (FPA) in dishes and cylinders and of wide-band receptors in aperture arrays. We will show that a hybrid SKA in three different antenna technologies will give the highest effective sensitivity for all six key science programs. |
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| Keywords: | aperture efficiency field-of-view focal plane arrays foreshortening efficiency system optimization |
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