Two methods for extraction of the effective tensor surface impedance representing metasurfaces with printed elements and arbitrary geometry are presented. The surface impedance can be modelled as a shunt admittance on a transmission line. The extracted surface impedance combined with transmission line theory enables to compute easily and efficiently the transmission coefficient through a multilayer metasurface structure. The metasurface modelling as a shunt admittance enables to conduct a multi-parameter study on the transmission and reflection performance through the metasurface structure. The results of the proposed methods are compared, and very good agreement was obtained up to 30° incident angle. Beyond 30° it is suggested to recalibrate the model or upgrade it. For model validation purposes, a 2D flat lens antenna with patch elements loaded with capacitors was designed, fabricated, and measured. Simulation and experimental results of the lens near and far-field are presented.
- metamaterial antennas
- microstrip antennas
ASJC Scopus subject areas
- Electrical and Electronic Engineering