Effect of capacitive coupling between split-ring resonators

There is much interest in metamaterials for the microwave and optical applications because their electromagnetic properties are vastly different from ordinary materials. The split ring resonator (SRR) is the canonical metamaterial structure that has a magnetic response without magnetic materials. Magnetic properties of the SRR are considered as the substrate of the microstrip patch antenna instead of high permittivity materials because we can, not only reduce the size of the patch, but also improve the bandwidth of the antenna using high permeability materials for substrates of microstrip patch antennas. We also can design multi-band antennas using various kinds of microstructure in substrates.