A Uniform Geometrical Optics and an Extended Uniform Geometrical Theory of Diffraction for Evaluating High Frequency EM Fields Near Smooth Caustics and Composite Shadow Boundaries PDF Download
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Author: Evagoras Demetriou Constantinides
Publisher:
ISBN:
Category :
Languages : en
Pages : 205
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Book Description
Author: Evagoras Demetriou Constantinides
Publisher:
ISBN:
Category :
Languages : en
Pages : 205
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723501647
Category :
Languages : en
Pages : 218
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Book Description
A uniform geometrical optics (UGO) and an extended uniform geometrical theory of diffraction (EUTD) are developed for evaluating high frequency electromagnetic (EM) fields within transition regions associated with a two and three dimensional smooth caustic of reflected rays and a composite shadow boundary formed by the caustic termination or the confluence of the caustic with the reflection shadow boundary (RSB). The UGO is a uniform version of the classic geometrical optics (GO). It retains the simple ray optical expressions of classic GO and employs a new set of uniform reflection coefficients. The UGO also includes a uniform version of the complex GO ray field that exists on the dark side of the smooth caustic. The EUTD is an extension of the classic uniform geometrical theory of diffraction (UTD) and accounts for the non-ray optical behavior of the UGO reflected field near caustics by using a two-variable transition function in the expressions for the edge diffraction coefficients. It also uniformly recovers the classic UTD behavior of the edge diffracted field outside the composite shadow boundary transition region. The approach employed for constructing the UGO/EUTD solution is based on a spatial domain physical optics (PO) radiation integral representation for the fields which is then reduced using uniform asymptotic procedures. The UGO/EUTD analysis is also employed to investigate the far-zone RCS problem of plane wave scattering from two and three dimensional polynomial defined surfaces, and uniform reflection, zero-curvature, and edge diffraction coefficients are derived. Numerical results for the scattering and diffraction from cubic and fourth order polynomial strips are also shown and the UGO/EUTD solution is validated by comparison to an independent moment method (MM) solution. The UGO/EUTD solution is also compared with the classic GO/UTD solution. The failure of the classic techniques near caustics and composite shadow boundaries is clearly demonstra...
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 548
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1482
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 738
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Author:
Publisher:
ISBN:
Category : Electromagnetism
Languages : en
Pages : 640
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 474
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Book Description
Author: John H. Meloling
Publisher:
ISBN:
Category :
Languages : en
Pages : 295
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Book Description
Author: Graeme L. James
Publisher: IET
ISBN: 9780863410628
Category : Science
Languages : en
Pages : 312
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Book Description
The purpose of the book, apart from expounding the Geometrical Theory of Diffraction (GTD) method, is to present useful formulations that can be readily applied to solve practical engineering problems.
