Closed-form Harmonic Contrast Control with Surface Impedance Coatings for Conductive Objects

Giuseppe Labate, Symon Podilchak, Ladislau Matekovits

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The problem of suppressing the scattering from conductive objects is addressed in terms of contrast reduction. A unique compact closed-form solution for a surface impedance Zs(m, kr) is found in a straightforward manner and without any approximation as a function of the harmonic index m (scattering mode to suppress) and of the frequency regime kr (product of wavenumber k and radius r of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for kr << 1 and m = 0. In addition, beyond quasi-static regime, impedance coatings for a selected dominant harmonic wave can be build with their proper dispersive behaviour, resulting in improved reduction levels and harmonic filtering capability.
Original languageEnglish
Pages (from-to)10055-10059
Number of pages5
JournalApplied Optics
Volume56
Issue number36
Early online date22 Nov 2017
DOIs
Publication statusPublished - 20 Dec 2017

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