The problem of suppressing the scattering from conductive objects is addressed in terms of harmonic contrast reduction. A unique compact closed-form solution for a surface impedance (,  ) is found in a straightforward manner and without any approximation as a function of the harmonic index (scattering mode to suppress) and of the frequency regime (product of wavenumber and radius of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for ≪1 and =0. In addition, beyond the quasi-static regime, impedance coatings for a selected dominant harmonic wave can be designed with proper dispersive behavior, resulting in improved reduction levels and harmonic filtering capability.

Closed-form harmonic contrast control with surface impedance coatings for conductive objects / Labate, Giuseppe; Podilchak, Symon K.; Matekovits, Ladislau. - In: APPLIED OPTICS. - ISSN 1559-128X. - ELETTRONICO. - 56:36(2017), pp. 10055-10059. [10.1364/AO.56.010055]

Closed-form harmonic contrast control with surface impedance coatings for conductive objects

Labate, Giuseppe;Matekovits, Ladislau
2017

Abstract

The problem of suppressing the scattering from conductive objects is addressed in terms of harmonic contrast reduction. A unique compact closed-form solution for a surface impedance (,  ) is found in a straightforward manner and without any approximation as a function of the harmonic index (scattering mode to suppress) and of the frequency regime (product of wavenumber and radius of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for ≪1 and =0. In addition, beyond the quasi-static regime, impedance coatings for a selected dominant harmonic wave can be designed with proper dispersive behavior, resulting in improved reduction levels and harmonic filtering capability.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2696045
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