A fully integrated coplanar waveguide (CPW) left-handed (LH) metamaterials medium for RF/MMIC applications is proposed and demonstrated by measurements. LH metamaterials have the potential to miniaturise RF/MMIC circuits and in this paper, we present a novel, fully integrated LH transmission line (TL). The compactness of the proposed LH-TL is the key advantage in integrated RF/MMIC circuit applications.