Simulation of Refraction Focusing Using Negative-Refractive-Index Metamaterials

A realization of a negative-refractive-index (NRI) metamaterial uses a periodic structure with a unit cell composed of a capacitively loaded loop (CLL) and a conducting pole. This realization can lead to a lens mechanism with refraction focusing. This paper presents the results of a simulation of such refraction focusing using Ansoft's HFSS. The simulation shows the return loss of a transmitting probe in a parallel-plate structure and the insertion loss between the transmitting probe and three receiving probes placed at the same distance from the transmitter but on the opposite side of the metamaterial slabs. The focusing at the center receiving probe is represented by the low insertion loss to the center probe compared with higher insertion losses to the other probes located at the same distance.