Erratum to: Bandwidth enhancement of transformation optics-based cloak with reduced parameters

1 Erratum to: Appl. Phys. A DOI 10.1007/s00339-015-9235-8

The original version of this article unfortunately contained a mistake.

The presentation of Eqs. (1)–(3) was incorrect. The correct versions are given below:

$$ \mu_{\rm r} = \left( {\frac{{r - a^{\prime } }}{r}} \right)^{2},\quad \mu_{\theta } = 1,\quad \epsilon_{z} = \left( {\frac{b}{{b - a^{\prime } }}} \right)^{2} $$

(1)

$$ \mu_{\rm r} = \left( {\frac{{r - a^{\prime } }}{r}} \right)^{2},\quad \mu_{\theta } = 1,\quad \epsilon_{z} = \left( {\frac{b}{{b - \bar{a}}}} \right)^{2} $$

(2)

$$ n_{\text{r}} = \left( {\frac{b}{{b - \bar{a}}}} \right),\quad n_{\theta } = \left( {\frac{{r - a^{\prime } }}{r}} \right)\left( {\frac{b}{{b - \bar{a}}}} \right) $$

(3)