Modeling of microstrip and PCB traces to enhance crosstalk reduction

It is important for designers to know if crosstalk problems may arise in their final designs. An analytical expression to calculate the crosstalk would help the circuit designers to locate the pair of lines which is most sensitive to crosstalk interference. In this paper, we propose a simple and easy technique to reduce crosstalk between three-PCB traces transmission lines. We used rectangular cross-section conductors immersed in an inhomogeneous medium. First, we present two electric equivalent models for three-conductor transmission lines. These models allow us to calculate crosstalk between conductors. Secondly, to validate the presented models, we compare the theoretical results with simulation data. Finally, by changing the position of the reference line we demonstrate that the crosstalk changes also and the smallest value is reached when we choose the reference line in the middle of the structure.