  We apply the transformation-optics approach to the design of a metamaterial
radome that can extend the scanning angle of a phased-array antenna. For
moderate enhancement of the scanning angle, via suitable parameterization and
optimization of the coordinate transformation, we obtain a design that admits a
technologically viable, robust and potentially broadband implementation in
terms of thin-metallic-plate inclusions. Our results, validated via
finite-element-based numerical simulations, indicate an alternative route to
the design of metamaterial radomes which does not require negative-valued
and/or extreme constitutive parameters.
