Refractive properties of wire-grid metamaterials

Abstract

This paper reports on a quantitative analysis of the electromagnetic properties of an arrangement of periodic metallic grids devised to provide in the 12.5–20.0 GHz frequency range a refractive index less than unity with view to enhance the functionalities of microwave horn antennas. Based on an analytical model, the ultra-refractive behavior of the metamaterial structure is demonstrated by the impedance and refractive index values retrieved from simulated scattering parameters.

Keywords:

• artificial dielectric
• near-zero refractive index
• metamaterial
• constitutive parameters
• antenna directivity enhancement

Acknowledgements

We thank the Scientific and Technological Research Council of Turkey (TUBITAK) for supporting the commercial CST Microwave Studio software with version 2013 under the project Grant Number [112R032].