Abstract

In this paper, we propose a new multi band meta-material structure composed of a unit cell that has multiple hexagonal-shaped metal rings printed one inside the other. The introduced meta-material composition exhibits multi-resonant behavior due to distinct magnetic resonances caused by the self and mutual coupling of each inclusion. The number of distinct magnetic resonances is determined by the number of hexagonal-shaped rings placed in the unit cell. By using three rings, three distinct resonance frequencies can be shifted to desired values simply by changing the design parameters what is described in the paper. Transmission and reflection spectra of the proposed structure are obtained by using the CST microwave studio to observe its resonance frequencies. Then, the effective permeability and effective permittivity are retrieved from the already computed complex S-parameters to demonstrate the presence of three distinct negative permeability bandwidths.

Key words: Left-handed material, hexagonal split ring resonator, negative permeability, simulation.