Aperture antennas and diffraction theory

書誌事項

Aperture antennas and diffraction theory

E.V. Jull

(IEE electromagnetic waves series, 10)

P. Peregrinus on behalf of the Institution of Electrical Engineers, c1981

大学図書館所蔵 件 / 12

この図書・雑誌をさがす

注記

Bibliography: p. [147]-152

Includes indexes

内容説明・目次

内容説明

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.

目次

Chapter 1: Introduction Chapter 2: Plane waves from apertures Chapter 3: Fourier transform representation of aperture patterns Chapter 4: Near-field radiation patterns Chapter 5: Aperture gain Chapter 6: Applications of aperture theory to antennas Chapter 7: Diffraction by conductors with sharp edges Chapter 8: Geometrical theory of diffraction by edges Chapter 9: Applications of geometrical diffraction theory to antennas Appendixes

「Nielsen BookData」 より

関連文献: 1件中  1-1を表示

詳細情報

ページトップへ