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Radiation fields of a radial dipole located on a metal sphere coated by a layer of metamaterial

Radiation fields of a radially oriented dipole located on a metal sphere coated with a thin layer of absorbing metamaterial are investigated. Numerical simulations were performed by using the electric Green's function for the space outside of an impedance sphere. An impedance of the metamaterial layer required to minimize the influence of the spherical scatterer with resonant dimensions upon the directivity of the dipole radiation in the wave zone was estimated.