Fundamentals of Antenna Theory
Analytic solutions of Maxwell’s equations (2.4)–(2.7) are rather simple for plane harmonic waves, but are very complex for realistic configurations. As a simplification of the mathematics, we introduce new functions, the electrodynamic potentials Φ and \(
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Thomas L. Wilson Kristen Rohlfs Susanne Hüttemeister
Tools of Radio Astronomy Sixth Edition
ASTRONOMY AND ASTROPHYSICS LIBRARY Series Editors:
G. Börner, Garching, Germany A. Burkert, München, Germany W. B. Burton, Charlottesville, VA, USA and Leiden, The Netherlands A. Coustenis, Meudon, France M. A. Dopita, Canberra, Australia B. Leibundgut, Garching, Germany G. Meynet, Versoix, Switzerland P. Schneider, Bonn, Germany V. Trimble, LCOGT, Irvine, CA, USA
Thomas L. Wilson Kristen Rohlfs Susanne Hüttemeister
Tools of Radio Astronomy Sixth Edition
123
Thomas L. Wilson Naval Research Laboratory Washington, DC USA
Kristen Rohlfs Inst. Astrophysik Ruhr-University-Bochum Bochum Germany
Susanne Hüttemeister Zeiss Planetarium Bochum Bochum Germany
ISSN 0941-7834 ISBN 978-3-642-39949-7 ISBN 978-3-642-39950-3 (eBook) DOI 10.1007/978-3-642-39950-3 Springer Heidelberg New York Dordrecht London Library of Congress Control Number: 2013955089 c Springer-Verlag Berlin Heidelberg 2013 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein. Cover illustration: In the foreground are dipole antennas of Long Wavelength Array station 1 (LWA1). In the background are some of the twenty-eight 25-meter paraboloids of the Jansky-Very Large Array (JVLA), of the National Radio Astronomy Observatory (NRAO). The LWA1 consists of 256 dual polarization, active dipole antennas (designed
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