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 language | English |
|---|---|
| Pages (from-to) | 10055-10059 |
| Number of pages | 5 |
| Journal | Applied Optics |
| Volume | 56 |
| Issue number | 36 |
| Early online date | 22 Nov 2017 |
| DOIs | |
| Publication status | Published - 20 Dec 2017 |