A novel three-dimensional (3D) lumped circuit-based metamaterial topology to model a 2D fishnet structure is proposed. The rotated transmission-line matrix (RTLM) unit cell, obtained as one independent half cell from the typical TLM unit cell by rotating the polarisations on each TLM un it port by 45$deg$, saves computation time and decreases the cost in processing data when a structure is analysed, espe cially when some specific components of the structure are processed. Here, an RTLM unit cell is used to construct th e lumped circuit of a fishnet structure. The dispersion characteristics of the lumped fishnet circuit are obtai ned and used to analyse the eigenmode and the propagation coefficient and Bloch impedance are investigated to expla in the frequency characterist ics. At the frequency region considered, the same left-handed frequency behaviour of the lumped fishnet circuit i s achieved by the proposed compact fishnet RTLM model, agreeing well with the simulation results.     «

A novel three-dimensional (3D) lumped circuit-based metamaterial topology to model a 2D fishnet structure is proposed. The rotated transmission-line matrix (RTLM) unit cell, obtained as one independent half cell from the typical TLM unit cell by rotating the polarisations on each TLM un it port by 45$deg$, saves computation time and decreases the cost in processing data when a structure is analysed, espe cially when some specific components of the structure are processed. Here, an RTLM unit cell...     »