Electromagnetic scattering by anisotropic impedance half and full planes illuminated at oblique incidence

Nepa, Paolo; Manara, Giuliano; Armogida, A.

doi:10.1109/8.910537

Cited by 6 publications

(5 citation statements)

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“…On the other hand, there have been investigations for the diffraction effects of anisotropic surfaces including half-planes, full planes, wedges, or discontinuities formed by any of these canonical structures (Serbest, Büyükaksoy, & Uzgören, 1991;Büyükak-soy, Serbest, & Kara, 1996;Nepa, Manara, & Armogida, 2001;Generalli et al, 1999;Lyalinov & Zhu, 1999). In some of these works, the solution (Serbest, Büyükaksoy, & Uzgören, 1991;Büyükaksoy, Serbest, & Kara, 1996) is obtained by the Fourier transform technique leading to a matrix Wiener-Hopf equation, and the others are based on the use of the Sommerfeld-Maliuzhinets method (Lyalinov & Zhu, 1999;Nepa, Manara, & Armogida, 2001) or equivalent surface currents of physical optics (PO) (Generalli et al, 1999).…”

Section: Introductionmentioning

confidence: 98%

“…In some of these works, the solution (Serbest, Büyükaksoy, & Uzgören, 1991;Büyükaksoy, Serbest, & Kara, 1996) is obtained by the Fourier transform technique leading to a matrix Wiener-Hopf equation, and the others are based on the use of the Sommerfeld-Maliuzhinets method (Lyalinov & Zhu, 1999;Nepa, Manara, & Armogida, 2001) or equivalent surface currents of physical optics (PO) (Generalli et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Scattering of Plane Waves at the Junction of Two Corrugated Half-Planes

2005

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In this paper, the boundary conditions given by Weinstein (1969) are employed to simulate two corrugated half-planes with the same slot height but different slot width. The scattering mechanism at the junction of these half-planes is investigated via the Fourier transform technique, which leads to two coupled Wiener-Hopf equations. The solution of the Wiener-Hopf system is obtained by the Daniele-Khrapkov method and some numerical results are presented about the analysis of the scattered field.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Scattering of Plane Waves at the Junction of Two Corrugated Half-Planes

2005

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“…In recent years, the electromagnetic scattering from targets coated by anisotropic materials has been an area of great interest and considerable value in engineering and military applications [1][2][3][4][5][6][7][8][9]. There is a great need for continuing and increasing the efforts launched on the research of scattering characteristics (frequency response, spatial distribution, and polarization) of these coating targets.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the diffracted current basis functions used in the hybrid MoM-PO method

Zhang

Xiao

Zhu

et al. 2007

Front. Electr. Electron. Eng. China

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field distribution in a given medium. As a low-frequency technique, the method has been applied to such problems for which the structure, owing to the memory storage, is small in terms of wavelength. At the same time, the physical optics (PO) and the geometrical theory of diffraction (GTD) [11] are applicable to bodies that are arbitrarily large in the electrical sense and may subsequently be referred to as high frequency techniques. The applications of diffraction theories, however, are limited to geometries for which the diffraction coefficient is known. Therefore, a combination of MoM and PO or GTD may lead to a power tool of handling a whole host of new problems.Brunside utilized the hybrid MoM-GTD technique to solve scattering problems of incident plane waves by perfectly conducting right-angled wedge [12]. Bilow developed a hybrid MoM-PO solution for the currents induced by incident plane waves on infinite two-dimensional wedges with faces characterized by arbitrary tensor impedances [13]. The difference of their methods is essentially a variation in DCBF. One is based on GTD and another is based on uniform geometrical theory of diffraction (UTD). The results obtained by using Bilow's diffracted current basis function (DCBF) are in good agreement with the exact solutions in general cases. However, Bilow's basis function results in grave errors in some cases. In terms of the theory of diffraction and the fundamental theory of electromagnetism, we modify their basis functions both within and outside the transition regions. Comparison between Burnside's DCBF and Bilow'sThe geometry for the scattering problem is illustrated in Fig. 1. The wedge has its edge along the z-axis of a cylindrical reference frame and a monochromatic plane wave with an arbitrary polarization impinges on the edge from a direction determined by the two angles wp and bp. bp refers to the edge of the wedge, and the case bp = p/2 corresponds to normal incidence. The exterior wedge angle is np. The face w = 0 of the wedge relies on the x-z plane. An e −jvt time dependence is assumed and suppressed.Abstract The combined moment method (MoM)-physical optics (PO) approach proposed by Bilow fails in some cases. Based on the theory of diffraction and the fundamental theory of electromagnetism, Bilow's diffracted current basis function was modified both within and outside the transition regions. The improved MoM-PO technique is validated by comparison with exact solutions for a right-angled perfectly conducting wedge at normal incidence.

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“…An open hard surface is studied by Sipus et al [1996] by considering a grounded dielectric slab illuminated by a spectrum of plane waves with no component of the electric field in the direction of propagation along the surface. The three‐dimensional scattering from the infinite and semi‐infinite plain surfaces with anisotropic impedance is analyzed by Nepa et al [2001], and scattering from the edges of anisotropic impedance surfaces is studied by Manara et al [2000]. The asymptotic boundary conditions (ASBC) are applied by Kishk et al [1998] instead of using the Floquet mode expansions for the problem of scattering from a cylinder with dielectric‐filled corrugations.…”

Section: Introductionmentioning

confidence: 99%

Dyadic Green's function of an ideal hard surface circular waveguide with application to excitation and scattering problems

et al. 2005

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[1] Green's function analysis of ideal hard surface circular waveguides is proposed with application to excitation and scattering problems. A decomposition of the hard surface waveguide into perfect electric conductor and perfect magnetic conductor waveguides allows the representation of dyadic Green's function in terms of transverse electric (TE) and transverse magnetic (TM) waveguide modes, respectively. In addition, a term corresponding to a transverse electromagnetic (TEM) mode is included in the representation of the Green's dyadic. The TEM term is extracted in closed form from the eigenmode expansion of TM and TE modes in the zero-cutoff limit. The electric field distribution due to an arbitrarily oriented electric dipole source is illustrated for representative TM, TE, and TEM modes propagating in the ideal hard surface circular waveguide. The derived Green's function is used in the method of moments analysis of an ideal hard surface waveguide excited by a half-wavelength strip dipole antenna. In addition, the scattering of the TEM mode by a thin strip is studied in the ideal hard surface circular waveguide.

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Electromagnetic scattering by anisotropic impedance half and full planes illuminated at oblique incidence

Cited by 6 publications

References 4 publications

Scattering of Plane Waves at the Junction of Two Corrugated Half-Planes

Scattering of Plane Waves at the Junction of Two Corrugated Half-Planes

Analysis of the diffracted current basis functions used in the hybrid MoM-PO method

Dyadic Green's function of an ideal hard surface circular waveguide with application to excitation and scattering problems

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