Diffraction by 90° penetrable wedges with finite conductivity

Gennarelli, Gianluca; Riccio, Giovanni

doi:10.1364/josaa.31.000021

Cited by 14 publications

(6 citation statements)

References 24 publications

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“…This last point is strictly related to the PO approximation and limits the evaluation of the scattered field at the beginning of the UAPO approach. It is authors' opinion that the inclusion of further wave contributions can improve the formulation of the equivalent surface currents to be used also in the shadow region, but this means abandoning the simplicity of the PO approximation and probably preventing the determination of a UTD-like solution in closed form as in [19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Go Field and Po Surface Currentsmentioning

confidence: 99%

“…The research team has denoted it as Uniform Asymptotic Physical Optics (UAPO) approach since it is based on the PO approximation of electric and magnetic equivalent surface currents radiating in the surrounding region. References [19][20][21][22][23][24][25][26][27][28][29][30][31] provide the UAPO solutions to some diffraction problems. Pros and cons of such solutions have been identified and highlighted in these manuscripts.…”

Section: Introductionmentioning

confidence: 99%

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Diffraction of Plane Waves by Arbitrary-Angled Coated Wedges

Riccio¹,

Gennarelli²,

Ferrara³

et al. 2022

PIER M

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This research work deals with the plane wave diffraction by a coated perfect electrically conducting wedge with arbitrary apex angle. The uniform layer covering the impenetrable wedge is made of a standard double positive material or an unfamiliar double negative metamaterial with negative permittivity and permeability at the operating frequencies. The propagation mechanism is studied when the incidence direction is perpendicular to the edge of the composite structure, and uniform asymptotic solutions are proposed to evaluate the diffraction contribution for both the polarizations. Such approximate solutions are obtained by using the Uniform Asymptotic Physical Optics approach based on electric and magnetic equivalent surface currents radiating in the neighboring free space. The related expressions are user-friendly and provide reliable field values as verified by numerical tests involving a full-wave electromagnetic solver.

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Section: Go Field and Po Surface Currentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffraction of Plane Waves by Arbitrary-Angled Coated Wedges

Riccio¹,

Gennarelli²,

Ferrara³

et al. 2022

PIER M

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“…Note that such a choice of the medium characteristics does not represent a limitation to the approach [19]. The wedge surfaces are denoted by and .…”

Section: Uapo Solutionsmentioning

confidence: 99%

High-Frequency Evaluation of the Field Inside and Outside an Acute-Angled Dielectric Wedge

Gennarelli

Frongillo

Riccio

2015

IEEE Trans. Antennas Propagat.

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Explicit closed form solutions are presented for the high-frequency evaluation of the electromagnetic field produced inside and outside an acute-angled lossless penetrable wedge. Both cases of -and -polarized incident plane waves are addressed in the study. The problem is tackled and solved in the framework of the uniform theory of diffraction, so that the total field at the observation point is determined by adding the geometrical optics contributions and the diffraction one. This last is obtained by performing a uniform asymptotic evaluation of the radiation integrals arising from a physical optics approximation for the equivalent electric and magnetic surface currents lying on the infinite wedge boundaries. No limitation exists on the refractive index of the structure. The accuracy of the solution is assessed by comparisons with data produced by numerical tools. The physical optics approximation gives rise to inaccuracies when using the solution at grazing incidence and in correspondence of the dielectric interfaces.

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“…The well-known limitations of the PO-based techniques and the absence of the surface waves in the UAPO approach can decrease the accuracy of the estimated field values in particular cases, e.g., incidence directions close to the grazing one [18]. Other canonical problems solved by means of the UAPO approach can be found in [19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Scattering from a 90° Metallic Wedge with One Face Coated by a Double Negative Metamaterial Layer

Riccio¹,

Gennarelli²,

Ferrara³

et al. 2022

PIER M

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This manuscript refers to the electromagnetic scattering problem involving plane waves at skew incidence with respect to the edge of a right-angled metallic wedge having one face coated by a double negative metamaterial sheet. Its presence in the propagation scenario is properly accounted at high frequencies by considering the geometrical optics response of the structure and the diffraction contribution arising from the edge of the wedge. In particular, the reflection coefficients related to the coated surface are determined for both the polarizations by using the equivalent transmission line circuit, whereas the diffraction coefficients are obtained by applying the uniform asymptotic physical optics approach. This last is based on electric and magnetic equivalent surface currents under the physical optics approximation and permits to evaluate the diffraction contribution in the context of the uniform geometrical theory of diffraction. The resulting approximate solution is characterized by the same simplicity of use of the heuristic solutions and provides reliable field values as confirmed by the numerical tests carried out by a full-wave commercial software.

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Diffraction by 90° penetrable wedges with finite conductivity

Cited by 14 publications

References 24 publications

Diffraction of Plane Waves by Arbitrary-Angled Coated Wedges

Diffraction of Plane Waves by Arbitrary-Angled Coated Wedges

High-Frequency Evaluation of the Field Inside and Outside an Acute-Angled Dielectric Wedge

Scattering from a 90° Metallic Wedge with One Face Coated by a Double Negative Metamaterial Layer

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