Analysis of Cable-Coupled Interference

The growing problem of cablecoupled interference and the need for prediction techniques are discussed. The basic coupling mechanisms are described and the mutual coupling parameters are defined. An analytical model is postulated for a general N-circuit cable complex, based upon the assumption of linearity. Difficulties in formulating a rigorous solution for the interference transfer functions are discussed. Six possible approaches for deriving the transfer functions are presented, and the general solutions are given. The relative complexity and accuracy of each approach is discussed. A sample analysis is given, illustrating the manner in which pertinent interference parameters can be derived from a knowledge of the interference transfer functions. Analytical results for various cable configurations are compared. Experimental results are presented and compared with theoretical predictions.