Agile double negative metamaterial unit-cell for advanced antenna applications

This paper presents the design and simulation of an agile unit-cell structure for DNG (Double Negative) metamaterials. DNGs are artificial materials with negative permittivity and permeability at the same time. The presented unit-cell can switch between a two-turn spiral resonator and two concentric rings similar to a conventional DSR (Double Split-ring Resonator). Two PIN diodes are embedded in the structure to provide the possibility of reconfigurability. The S-parameters of the structure in both states are obtained using CST Microwave Studio and then the results of CST are being processed in an algorithm for extraction of the effective permittivity and permeability. According to the simulation results, this structure exhibits two different behaviors for relative permittivity and permeability in each state of the diodes.