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

Abstract

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