Analysing Metamaterial Layer by Simpler Approach Based on Mode Matching Technique

摘要

Analysis of metamaterial layer is carried out by a simple method in this study. In this analysis, a metamaterial element is modelled by a planar discontinuity located transversely in a transverse electromagnetic waveguide. The existence of a discontinuity in the way of a propagating wave causes scattering waves to form in the vicinity of discontinuity. With the aid of modal analysis, the scattering waves in this model are expanded into different modes propagated in this structure. To obtain the amplitude of each mode, an equation is formed and solved in a way which obviates the authors' need for directly considering boundary conditions on both sides of discontinuity. Using this method, the amplitude of excited modes is achieved in a simpler, faster and more straightforward manner. This technique can be applied to any arbitrary-shaped metasurface. The steps needed to derive the new relation are presented herein. Simulation results with full-wave software, then, confirm the reasonable accuracy of the proposed method with the aid of several examples. Simulation results agree fairly well with each other.