Volume 10. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. Book contains pen markings. In poor condition, suitable as a reading copy. Dust jacket in good condition. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,550grams, ISBN:0906048524.

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Bibliografische Details

Titel

Aperture Antennas and Diffraction Theory (Volume 10)

Verlag

Peter Peregrinus Ltd - on Behalf of the Institution of Electrical Engineers

Erscheinungsjahr

1981

Sprache

Englisch

ISBN-10

0906048524

ISBN-13

9780906048528

Einband

Hardcover

Zustand

Poor

Zustand des Schutzumschlags

Schutzumschlag

Verk�uferkataloge

Engineering

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Inhaltsangabe

Two powerful techniques for the analysis of aperture antennas are now used. One is based on the convenient Fourier transform relationship between aperture field and far-field radiation pattern. Here this relationship is derived from the plane wave spectrum representation of the aperture fields. In the near field of the aperture, Fourier transforms become Fresnel transforms. Far-field patterns may be predicted from near-field measurements by treating the near field as the aperture plane. In its application this method is basically the Kirchhoff approximation of diffraction theory. It is accurate for the forward fields of large antennas but cannot provide the lateral and back radiation.

The other method is based on aperture edge diffraction and called the geometrical theory of diffraction. It is developed from an asymptotic approximation to rigorous diffraction theory. Inherently more accurate and more widely applicable, it is especially useful in the calculation of antenna radiation in the lateral and rear directions. However, at present it fails in some situations where the Kirchhoff method succeeds, for example the axial fields of paraboloidal reflectors. In this sense the two methods are complementary and often both are required in antenna analysis. Application of the two methods to the calculation of the pattern, gain and reflection coefficient of some common antenna types is shown and comparisons are made with experiment.

�ber die Autorin bzw. den Autor

Edward V. Jull was born in Calgary, Alberta, Canada in 1934. He received the B.Sc. degree in engineering physics from Queen's University, Kingston, Ontario, in 1956. From 1957-59 he held an Athlone Fellowship at University College, London and received the Ph.D. degree in electrical engineering in 1960. He was awarded a D.Sc. (Eng.) from the University of London in 1979.

In 1956-57 and 1961-72 he was with the Division of Radio and Electrical Engineering of the National Research Council, Ottawa working on antennas and electromagnetic diffraction theory. During 1963-65 he was a guest researcher at the Laboratory of Electromagnetic Theory of the Technical University of Denmark and the Microwave Institute of the Royal Institute of Technology, Stockholm. In 1972 he joined the Department of Electrical Engineering of the University of British Columbia, Vancouver. During 1979-80 he was on leave and back at the National Research Council, Ottawa, as a visiting scientist.

Professor Jull was a joint winner in 1965 of the Bolljahn Memorial Award of the IEEE Antennas and Propagation Society. He has been chairman of Canadian Commission VI for the International Union of Radio Science (URSI) and is currently chairman of the Canadian National Committee for URSI. He is an associate editor of Radio Science.

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