Crosstalk in Uniformly Coupled Lossy Transmission Lines

One of the earliest analyses of crosstalk in coupled transmission lines was made by Campbell j1 later Shelkunoff and Odarenko2 used a similar method to analyze the crosstalk in coaxial structures. These "classical" formulas were derived for two parallel transmission lines with weak coupling and matched terminations. One drawback of these analyses is that they do not take into account the effect of the disturbed line on the disturbing line. However, their crosstalk formulas are simple in form and easy to analyze. Also, they are applicable to any parallel, uniformly coupled transmission lines with weak coupling. Somewhat later an analysis of coupled transmission lines was made by Rice.3 His results apply under quite general conditions and are expressed in compact matrix notation. However, his results have apparently not influenced current analyses, possibly because the formulas are more complicated to analyze than those in Refs. 1 and 2. Coupling between two pairs under similarly general conditions is 101