Abstract
In this paper we propose a rigorous method to evaluate the crosstalk performance for coupled non uniform transmission lines, In this method, the width of the non uniform line is subdivided into a large number of rigorously coupled narrow lines. So, non uniform lines can be considered as a coupled multi-conductor transmission line. An electric equivalent model is developed to calculate the crosstalk between coupled non uniform transmission lines. Determination of the per-unit length capacitance and inductance parameters of the model is introduced. Finally, we demonstrate that coupled non uniform lines give the best performance in term of crosstalk compared to coupled microstrip lines.