Study, design and fabrication of polarization-independent metamaterials

Abstract

Conventionally, to obtain the negative permeability and negative refraction metamaterials, the split-ring resonator (SRR) and cut-wire-pafr (CWP) were applied. However, the properties of these structuresare strongly dependent on the polarization of electromagnetic waves. In this report, we used a high symmetry structure -the so-called dish pair structurewhich based on the CWP structure, with the aim of removing this drawback. Each umt cell consists of two identical dishes, s5Tnmetrically arranged in a dielectric spacer, providing die negative permeability when interacting with the elecừomagnetic wave. By expanding the radius of the dish until two adjacent dish close each other, the negative refractive index can be obtained. This is important effect to have a tunable MMs by interacting with the external field. The results of studies using the simulation, experimental and calculation quite coincide. The obtained structuredoes not depend on the polarization of the incident wave. This result is very important for practical applications using the isotropic negative refraction metamaterials.