3D Field Simulations using FI Time Domain Technique of Wedge-and Parabolic-Shaped Left Handed Materials (LHM)

Wedge- and parabolic shaped structures composed of split-ring resonators (SRR) and wires are numerically simulated by evaluating its refraction and radiation behaviour using CST MICROWAVE STUDIOreg´s finite integration time domain solver. Negative phase velocity inside these metamaterials is demonstrated in the left-handed band and the Snell´s Law is conformed in terms of its refraction behaviour. Effective electric permittivity and magnetic permeability for these metamaterials are extracted directly from S-parameters of a SRR unit cell described with Lorentz/Drude dispersion models. It is demonstrated that both, models composed of a homogeneous left-handed-material (LHM) and models consisting of a large number of microscopic unit-cells show similar results. Antennas designed with metamaterials offer the ability to adjust phase center easily thereby showing a larger constant phase angle