COMMENT/CORRECTION: 'WAVES IN 2D ANISOTROPIC L-C LATTICE METAMATERIALS: PHENOMENOLOGY AND PROPERTIES'

摘要

In Brennan et al. (Microwave Opt Technol Lett 48 (2006), 2538-2542), in part 2, (for Y{sub}0 = 0) the unusual properties of an infinite bidimensional L-C lattice obtaining results concerning the propagation of waves (backward and forward propagation) were discussed. The same result was obtained in Brennan et al. (Microwave Symp Dig 2005 IEEE MTT-S Int 12-17 (2005), 1757-1760) (part II). This comment points out a more efficient performance analysis and shows that the behavior for backward (LHM) or forward (RHM) waves has no special restriction for values of the phase like φ{sub}i < π/2(i = 1,2). Moreover, it must be carefully treated that the symmetry of the phase diagram (isofrequency) for the first zone of Brillouin (φ{sub}i = [-π,π], with lattice periodicity 2π). Also, there is an unusual feature for the angle δ(φ{sub}1){sub}(X=const) between the group and phase velocities for backward waves, where there is a discontinuity for isofrequency X=1 at φ{sub}1=π.