Left-handed (LH) materials, first introduced theoretically back in 1968 [1], have spurred considerable excitement recently since the demonstration of their practical realizability [2], [3]. The unique properties of these metamaterials, verified by full-wave analysis in [4]. are promising for a diversity of optical/microwave applications, such as new types of beam steerers, modulators, band-pass filters. superlenses [5]. microwave couplers and antenna radorns. However, the LH structures presented so far are impractical for microwave applications. because of their too narrow bandwidth and too lossy characteristics, and alternative theories are desirable to gain a deeper insight into their behavior, We introduce here a transmission line (TL) approach of LH materials [6], provide a method to realize an artificial lumped-element LH-TL and propose a microstrip implementation of this line.