Variations of Complementary Split-Ring Resonators' Composite Media for In-Plane Wave Propagation

We present a numerical eigenmode approach for the investigation of the electromagnetic properties of complementary split-ring resonator media. Initially, we prove the necessity for metal backing of the structure, so as to support the resonant modes. Subsequently, we perform a parametric study modifying the distance between the resonators and the ground plane and observe the changes in the dispersion diagram. We finally propose a complementary resonator medium terminated partially at a ground plane, which maintains the dispersion diagram and the supported modes of the original, bulky metal-backed version.