Titre :	Asymptotic And Hybrid Methods in Electromagnetics
Type de document :	texte imprimé
Auteurs :	Iran Andronov, Auteur ; Daniel Bouche, Auteur ; Frédéric Molinet, Auteur
Editeur :	London : The Institution of Electrical Engineers
Année de publication :	2005
Collection :	IEE Electromagnetic Waves Series
Importance :	249 p.
Présentation :	couv. ill. en coul., ill.
Format :	24 cm.
ISBN/ISSN/EAN :	978-0-86341-447-3
Langues :	Anglais (eng)
Catégories :	ELECTROTECHNIQUE
Mots-clés :	Electromagnetic waves  electromagnetic wave diffraction.
Index. décimale :	10-06 Electromagnétisme
Résumé :	There have been significant developments in the field of numerical methods for diffraction problems in recent years, and as a result, it is now possible to perform computations with more than ten million unknowns. However, the importance of asymptotic methods should not be overlooked. Not only do they provide considerable physical insight into diffraction mechanisms, and can therefore aid the design of electromagnetic devices such as radar targets and antennas, some objects are still too large in terms of wavelengths to fall in the realm of numerical methods. Furthermore, very low Radar Cross Section objects are often difficult to compute using multiple methods. Finally, objects that are very large in terms of wavelength, but with complicated details, are still a challenge both for asymptotic and numerical methods. The best, but now widely explored, solution for these problems is to combine various methods in so called hybrid methods.
Note de contenu :	Contents 1 Asymptotic theory of diffraction 1.1 Introduction to the geometrical theory of diffraction 1.2 Boundary-layer method 2 Electromagnetic creeping waves 2.1 Creeping waves on a general surface 2.2 Special cases 2.3 Creeping waves on elongated objects 2.4 Creeping and whispering gallery waves at interfaces 3 Hybrid diffraction coefficients 3.2 Spectral representation of the fock field on a smooth surface 3.3 Hybrid diffraction coefficients for a curved wedge 3.4 Hybrid diffraction coefficients for curvature discontinuity 3.5 Solution valid at grazing incidence and grazing observation 3.6 Coated surfaces 3.7 Numerical results 4 Asymptotic currents 4.2 Asymptotic currents ON A 2D smooth convex surface 4.3 Asymptotic currents ON A 2D convex surface delimited by sharp edges 4.4 Asymptotic currents ON A 2D concave surface delimited by sharp edges 4.5 Three-dimensional perfectly conducting convex-concave surface 4.6 numerical results 5 Hybrid methods 5.1 Introduction-state-of-the-art 5.2 Equivalence theorem and its consequences 5.3 Application of the equivalence theorem to the hybridisation of the methods 5.4 Generalisation to coated objects 5.5 Brief review of asymptotic solutions adapted to the development of hybrid method 5.6 numerical results -Index

Asymptotic And Hybrid Methods in Electromagnetics [texte imprimé] / Iran Andronov, Auteur ; Daniel Bouche, Auteur ; Frédéric Molinet, Auteur . - London : The Institution of Electrical Engineers, 2005 . - 249 p. : couv. ill. en coul., ill. ; 24 cm.. - (IEE Electromagnetic Waves Series) .
ISBN : 978-0-86341-447-3
Langues : Anglais (eng)

Catégories :	ELECTROTECHNIQUE
Mots-clés :	Electromagnetic waves  electromagnetic wave diffraction.
Index. décimale :	10-06 Electromagnétisme
Résumé :	There have been significant developments in the field of numerical methods for diffraction problems in recent years, and as a result, it is now possible to perform computations with more than ten million unknowns. However, the importance of asymptotic methods should not be overlooked. Not only do they provide considerable physical insight into diffraction mechanisms, and can therefore aid the design of electromagnetic devices such as radar targets and antennas, some objects are still too large in terms of wavelengths to fall in the realm of numerical methods. Furthermore, very low Radar Cross Section objects are often difficult to compute using multiple methods. Finally, objects that are very large in terms of wavelength, but with complicated details, are still a challenge both for asymptotic and numerical methods. The best, but now widely explored, solution for these problems is to combine various methods in so called hybrid methods.
Note de contenu :	Contents 1 Asymptotic theory of diffraction 1.1 Introduction to the geometrical theory of diffraction 1.2 Boundary-layer method 2 Electromagnetic creeping waves 2.1 Creeping waves on a general surface 2.2 Special cases 2.3 Creeping waves on elongated objects 2.4 Creeping and whispering gallery waves at interfaces 3 Hybrid diffraction coefficients 3.2 Spectral representation of the fock field on a smooth surface 3.3 Hybrid diffraction coefficients for a curved wedge 3.4 Hybrid diffraction coefficients for curvature discontinuity 3.5 Solution valid at grazing incidence and grazing observation 3.6 Coated surfaces 3.7 Numerical results 4 Asymptotic currents 4.2 Asymptotic currents ON A 2D smooth convex surface 4.3 Asymptotic currents ON A 2D convex surface delimited by sharp edges 4.4 Asymptotic currents ON A 2D concave surface delimited by sharp edges 4.5 Three-dimensional perfectly conducting convex-concave surface 4.6 numerical results 5 Hybrid methods 5.1 Introduction-state-of-the-art 5.2 Equivalence theorem and its consequences 5.3 Application of the equivalence theorem to the hybridisation of the methods 5.4 Generalisation to coated objects 5.5 Brief review of asymptotic solutions adapted to the development of hybrid method 5.6 numerical results -Index