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An ultra-thin anisotropic metamaterial coating is proposed which greatly enhances the impedance bandwidth of a monopole antenna to over an octave. The metamaterial coating has a high effective permittivity for the tensor component oriented along the direction of the wire monopole. The metamaterial was successfully applied to an S-band monopole, showing a broadening of the VSWR<2 bandwidth from 0.4 GHz to 2.35 GHz in experiment, while preserving the radiation pattern at the same time.

anisotropic; antennas; broadband; metamaterials;