NDLI: Evaluation of the Radiation Efficiency and the Noise Temperature of Low-Loss Antennas

Content Provider	IEEE Xplore Digital Library
Author	Maaskant, R. Bekers, D.J. Arts, M.J. van Cappellen, W.A. Ivashina, M.V.
Copyright Year	2002
Abstract	An accurate evaluation of the noise temperature of noncooled antenna systems is of great importance, particularly if the specifications of the antenna alone are a few Kelvins as in applications for radio astronomy. This evaluation requires an accurate analysis of the radiation efficiency, which we evaluate through the computation of the dissipated power from a method-of-moments (MoM) solution. We examine the numerical accuracy and the mesh sensitivity of the computed efficiency. Moreover we show that the efficiency is numerically smaller than or equal to 100%, contrary to results obtained with several commercial solvers. To describe the antenna loss, we employ the surface impedance of a thin sheet. For arrays of loops and for a tapered-slot antenna (TSA), we compare our efficiency results with those obtained by commercial solvers and by numerical far-field integration for the radiated power.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1166
Ending Page	1170
Page Count	5
File Size	416648
File Format	PDF
ISSN	15361225
Volume Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Moment methods Receiving antennas Art Radio astronomy Surface impedance Finite difference methods Time domain analysis Conductors Kelvin surface impedance Antennas moment methods noise temperature radiation efficiency
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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