Fig. 3

(a) The isotropic state of the proposed unit cell, (b) the dispersion diagram of the isotropic unit cell, (c) the surface impedance curve of the isotropic unit cell at 18 GHz, (d) the anisotropic state of the proposed unit cell, the variation of (e) X1, and (f) X2 in terms of small and large arm length of the cross-bars.