A planar left-handed metamaterial based on electric resonators**Project supported by the National Natural Science Foundation of China (Grant Nos. 50632030 and 60871027), the National Basic Research Program of China (Grant No. 2009CB613306) and the Natural Science Foundation of Shaanxi Province, China (Grant No. SJ08F01).

Abstract

A planar left-handed metamaterial(LHM) composed of electric resonator pairs is presented in this paper. Theoretical analysis, an equivalent circuit model and simulated results of a wedge sample show that this material exhibits a negative refraction pass-band around 9.6GHz under normal-incidence and is insensitive to a change in incidence angle. Furthermore, as the angle between the arm of the electric resonators and the strip connecting the arms increases, the frequency range of the pass-band shifts downwards. Consequently, this LHM guarantees a relatively stable torlerence of errors when it is practically fabricated. Moreover, it is a candidate for designing multi-band LHM through combining the resonator pairs with different angles.