Dual-Band Coordinate Transformation by Anisotropic Media with Negative and Positive Eigenvalues

In this paper, dual-band coordinate transformation anisotropic media with negative and positive eigenvalues are proposed. The proposed media are derived from the 2-D anisotropic metamaterials with off-diagonal components by introducing duality with series capacitances and shunt inductances having series and shunt $LC$ resonators, respectively. It is demonstrated that the proposed media yield two different coordinate transformations with positive and negative eigenvalues at two different frequency ranges. Dual-band wave propagation is numerically demonstrated based on circuit simulations using SPICE simulator.