Journal ArticleDOI
Computer reconstruction of near-zone field from given far-zone data of two-dimensional objects
S. Hamada,C. Yeh +1 more
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Using a complete set of cylindrical vector wave functions, it was shown that accurate near-zone electromagnetic field can be easily reconstructed from given far-zone data of two-dimensional objects.Abstract:
Using a complete set of cylindrical vector wave functions, it is shown that accurate near-zone electromagnetic field can be easily reconstructed from given far-zone data of two-dimensional objects. The validity of this approach was shown by the comparison of the reconstructed results with those obtained according to the exact solution of a two-dimensional slit problem.read more
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Comparison of theoretical and experimental data for the near field of an open-ended rectangular waveguide
TL;DR: In this article, a comparison of theoretical and experimental data on the radiating near field of an open-ended waveguide (OEG) is presented, and two theoretical methods are examined.
References
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The fast Fourier Transform
TL;DR: A computer algorithm that computes the discrete Fourier transform much faster than other algorithms, is explained and examples and detailed procedures are provided to assist the reader in learning how to use the algorithm.
Journal ArticleDOI
The fast Fourier transform
E. O. Brigham,R. E. Morrow +1 more
TL;DR: The Fast Fourier Transform (FFT) as discussed by the authors is a computer algorithm that computes the discrete Fourier transform much faster than other algorithms, and it can be used to compute an N = 210-point transform 100 times faster than using a direct approach.
Journal ArticleDOI
The Diffraction of Waves by Ribbons and by Slits
TL;DR: In this article, the exact solution of the diffraction problem in elliptic cylinder coordinates is computed by the use of newly computed tables of Mathieu functions, where curves are given for the distribution in angle and total intensity scattered, for the diffusion by a slit or the scattering by a thin ribbon, of waves whose length is the same order of magnitude as the slit or ribbon width.
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The concept of an angular spectrum of plane waves and its relation to that of polar diagram and aperture distribution
Henry G. Booker,P.C. Clemmow +1 more
TL;DR: In this paper, a critical examination is made of the somewhat loose and incomplete statement that a polar diagram is the Fourier transform of an aperture distribution, and it is shown that if the aperture distribution is of such a nature that the concept of polar diagrams is applicable at sufficiently great distances, then the polar diagrams are equal to the angular spectrum.
Journal ArticleDOI
Near-field far-field transformations using spherical-wave expansions
TL;DR: In this article, the authors used spherical-wave expansions as a numerical technique for expressing arbitrary fields specified by analytical, experimental, or numerical data, and found that the generally accepted wave order cutoff value corresponds to 99.9 percent or more of the power in the input pattern.