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In this paper the crosstalk between nonuniform transmission lines is examined. Firstly, methods for prediction of crosstalk between microstrip transmission lines are reviewed. Classical coupled transmission line theory is used for uniform lines and cannot be used for nonuniform transmission lines. Secondly, equations are derived which can be solved to obtain formulas for the near-end and far-end crosstalk for nonuniform transmission lines. Finally, an example is worked which illustrates the crosstalk between three conductor nonuniform transmission lines. Obtained theoretical results were compared with simulations data. Comparison results shown that theoretical and simulation results are approximately the same.

In this work, we propose three electric equivalent models to evaluate crosstalk between three-conductor transmission lines. We used conductors with circular cylindrical and rectangular cross-section immersed in homogenous medium. First, we present proposed electric equivalent models for three-conductor transmission lines. Secondly, we develop rigorous equations to calculate the per-unit length inductive and capacitive parameters. These models allow us to calculate crosstalk between conductors. Finally, to validate the presented models, we compare the theoretical results with simulation data. Obtained results show that proposed models can be used to predict crosstalk performance.

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 inho-mogeneous 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.

Electromagnetic coupling to cables has been a major source of electromagnetic compatibility and electromagnetic interference problems. In this paper, we propose a simple and easy technique to reduce crosstalk between three-conductor transmission lines. We used ribbon cable with circular cylindrical section immersed in a homogeneous 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.