Study on Numerical Calculation of Crosstalk in Multiwire Transmission Lines

Wire crosstalk is an inadvertent electromagnetic compatibility interference (EMC/I) that may arise in multiconductor transmission lines (MTL). The current and voltage in generator circuit will influence the voltage and current in receiver circuit via mutual inductance ($L_{m}$) and mutual capacitance ($C_{m}$). This study presents the numerical calculation of crosstalk and its analysis in multiwire transmission line using a schematic model of MTL, emphasizing the identification of input and output termination resistances, along with the ratio of mutual inductance to mutual capacitance, derived from varying specified parameters. The results indicate that the alteration of the input and output termination values demonstrates a magnitude reduction. An exponential rise in the input and output termination resistances leads to an exponential decrease in the magnitude values in the same proportion. Concurrently, throughout the spectrum of $L_{\mathrm{m}}$ and $C_{\mathrm{m}}$ values, there is a decrease of magnitude, showing that the crosstalk magnitude remains largely unaffected by fluctuations in the component values. In low component value ranges, the $L_{\mathrm{m}} / C_{\mathrm{m}}$ ratio has a negligible impact on the crosstalk level. Therefore, to mitigate the impact of crosstalk on the wire, the values of $L_{\mathrm{m}}$ and $C_{\mathrm{m}}$ must be constrained to higher values.