A compact five-band SLR type metamaterial

In this paper, a novel single-loop resonator (SLR) type metamaterial topology is proposed with five distinct resonance frequencies placed within the frequency band from 2.8 GHz to 5.1 GHz displaying two ε-negative (ENG) and three μ-negative (MNG) bands. This new SLR unit cell is obtained by slightly modifying the geometrical structure of the square-shaped SLR that is recently reported in literature with only three resonances. Transmission and reflection characteristics of both standard square-shaped SLR and its newly modified version are simulated by two different full wave electromagnetic solvers, Ansoft´s HFSS and CST Microwave Studio, to verify the accuracy of numerical results. Effective permittivity and permeability parameters of these metamaterial structures are retrieved from simulated complex scattering parameters to verify the presence of distinct ENG and MNG regions. E-field distributions are computed over the conductive strips to investigate the mechanism of resonances. Finally, effects of substrate permittivity and substrate thickness on the values of resonance frequencies are inspected parametrically for the novel SLR topology.