By E.V. Jull
ISBN-10: 0906048524
ISBN-13: 9780906048528
Replacement tools of aperture antenna research are defined during this book.
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Substitute equipment of aperture antenna research are defined during this ebook. The establishment of Engineering and know-how is among the world's top expert societies for the engineering and know-how neighborhood. The IET publishes greater than a hundred new titles each year; a wealthy mixture of books, journals and magazines with a again catalogue of greater than 350 books in 18 diversified topic parts together with: -Power & strength -Renewable strength -Radar, Sonar & Navigation -Electromagnetics -Electrical dimension -History of know-how -Technology administration
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Extra resources for Aperture antennas and diffraction theory
Example text
This limitation can be overcome (Woodward and Lawson, 1948) but usually at the expense of 'supergain' effects discussed later. The same technique is used in the sampled data representation of band-limited signals. 24) is itself a Gaussian function. Thus a Gaussian distribution in an aperture of infinite extent gives a radiation pattern with no sidelobes. o (b] 47T 2 7r Sir k,a Fig. 7 T" (a) A truncated Gaussian aperture distribution (b) Its radiation pattern The dashed curve in (a) is exp[—2-3(2x/a)2] and in (b) its Fourier transform is exp[-0-435^, a/2) 2 ] In practice, the Gaussian aperture distribution is truncated at the aperture edges.
The operational method, specifically eqn. 32, is used to obtain the radiation pattern of where D = b/bki and j3 = n/rX. Since 0 < 1 for this representation to be valid, only the first few terms of the power series expansion of the operator B2 B3D6 are retained giving Tabulated values of the derivatives of the Fourier transforms of uniform and cosinusoidal distributions are available along with other data for the use of this method (Spencer and Austin, 1946; Milne, 1952). The near-field radiation patterns of a cosinusoidal distribution shown in Fig.
1 it is also assumed that tangential electric and magnetic fields in the aperture are related by plane wave conditions. All these approximations tend to improve in accuracy as the aperture dimensions increase in wavelengths. It is understood, however, that only radiation in the forward hemisphere can be calculated by the method and that if the boundary conditions in the aperture plane are not satisfied errors in the calculated field increase near the boundary. Generally the accuracy of the result decreases as the angle off the beam axis increases.
Aperture antennas and diffraction theory by E.V. Jull
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