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Inhomogeneous electromagnetic plane wave diffraction by a perfectly electric conducting wedge at oblique incidence
Author(s) -
Kouyoumjian R. G.,
Celandroni T.,
Manara G.,
Nepa P.
Publication year - 2007
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2007rs003680
Subject(s) - diffraction , wedge (geometry) , uniform theory of diffraction , plane wave , physics , optics , perpendicular , electromagnetic radiation , electromagnetic field , electric field , plane (geometry) , mathematics , geometry , mathematical analysis , quantum mechanics
The diffraction of an inhomogeneous electromagnetic plane wave obliquely incident on the edge of a perfectly conducting wedge is analyzed, to extend the results for the normal incidence case reported by Kouyoumjian et al. (1996). Uniform high‐frequency expressions are obtained for the diffracted field in the format of the uniform geometrical theory of diffraction (UTD). The generalized dyadic diffraction coefficient in the standard UTD ray‐fixed coordinate system is represented by a 2 × 2 full matrix with the extra‐diagonal terms accounting for a coupling between the two components of the incident and diffracted electric field parallel and perpendicular to the edge‐fixed incidence and diffraction plane, respectively. The latter characteristic of the diffraction matrix is due to both the vectorial properties of the evanescent incident electric field and the inclusion of higher‐order terms in the asymptotic expression of the edge diffracted field. The introduction of higher‐order terms in the asymptotic evaluation also guarantees an improved accuracy for smaller values of the large parameter, namely, for observation points closer to the diffracting edge, as compared with the ordinary UTD.

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