Simple formulas were derived to quickly estimate maximum crosstalk between wires in a harness at high frequencies, where the length of circuits is comparable with or greater than the wavelength of the signals of interest. Formulas were derived from multi-conductor transmission line theory. When the source and load resistances are either both large or both small compared to the characteristic impedance of the transmission line, maximum coupling is shown to be given by approximately XMAX = Cm / (C22 + Cm). A similar equation was found for the case where the load impedances are matched. Experiments show these equations predict the maximum value of coupling well.

Meeting Name

International Symposium on Electromagnetic Compatibility, EMC 2004 (2004: Aug. 9-13, Silicon Valley, CA)


Electrical and Computer Engineering

Keywords and Phrases

Characteristic Impedance; Coupled Transmission Lines; Crosstalk; Electromagnetic Compatibility; Electromagnetic Coupling; Harness Wires; Impedance Matching; Load Impedance Matching; Load Resistance; Maximum Coupling; Maximum System-Level Crosstalk; Multi-Conductor Transmission Line Theory; Multiconductor Transmission Lines; Source Resistance

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2004 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 2004