Figure 4. An anisotropic GRIN lens constructed by a special metamaterial and the effective parameters of metamaterial unit cells at 10 GHz.

(a) The lens with φ₁ = 0 and dimensions of the unit cell. (b) The effective permittivity and permeability for electric-field vector polarized along the y axis. (c) The effectively refractive index and impedance for electric-field vector polarized along the y axis. (d) The effective permittivity and permeability for electric-field vector polarized along the x axis. (e) The effectively refractive index and impedance for electric-field vector polarized along the x axis.