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Scattering by a right-angled lossy dielectric wedge

Scattering by a right-angled lossy dielectric wedge

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Electromagnetic scattering by a right-angled lossy dielectric wedge at normal incidence is considered in detail. The lossy dielectric material of the wedge is simulated using second-order impedance boundary conditions on its faces. The Maliuzhinets method is employed to obtain the total exterior field. A high-frequency asymptotic approximation of the Sommerfeld integral is carried out to obtain a UTD expression for the total field. The predictions are validated against experimental measurements taken in a controlled laboratory environment. A comparison with the widely used heuristic UTD diffraction coefficient of Luebbers is presented and the validity of the latter coefficient is discussed.

Inspec keywords: geometrical theory of diffraction; electromagnetic fields; electric impedance; integral equations; approximation theory; dielectric materials; electromagnetic wave scattering

Other keywords: total exterior field; experimental measurements; heuristic UTD diffraction coefficient; controlled laboratory environment; high-frequency asymptotic approximation; Maliuzhinets method; right-angled lossy dielectric wedge; electromagnetic scattering; second-order impedance boundary conditions; normal incidence; lossy dielectric material; Sommerfeld integral

Subjects: Electromagnetic wave propagation; Interpolation and function approximation (numerical analysis); Electromagnetic waves: theory; Numerical approximation and analysis

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