In this contribution a three-dimensional left-handed metamaterial is presented which is shown to be a physical implementation
of the rotated TLM scheme. The key characteristics of the metamaterial in terms of dispersion relation and Bloch
impedance as well as composite right/left-handed response are analysed. An implementation of the 3D metamaterial is
presented and measurements provided showing very good agreement. Different computational approaches to the analysis
of the structure aperiodic arrangements are discussed.