Split ring resonator and its evolved structures over the past decade: This paper discusses the nuances of the most celebrated composite particle (split-ring resonator) with which novel artificial structured materials (called metamaterials) are built

The introduction of the initial split-ring resonator(SRR) structure, inspired by the pioneering works of Pendry was a major breakthrough in realizing MNG(μ-negative) medium which is an essential component of left-handed medium(LHM). Since then SRR has been a major topic of interest in the metamaterial research fraternity. A complete review on the working of SRR, pros and cons of using SRR in microwave applications over other naturally existing magnetic materials is presented in this paper. Various parameters influencing the resonant frequency of SRR are also discussed. In the quest for achieving reduced size and improved performance different structures have been proposed by researchers. Complete survey on different structures that have evolved over the period are discussed.