General crosstalk equations between two braided coaxial cables in free space

Earlier theoretical studies consider current dominant coupling only as being responsible for crosstalk between two coaxial cables and ignore coupling due to electric field parameters. In the paper, general crosstalk equations between two similar braided coaxial cables are derived by including both electric and magnetic coupling parameters in the analysis. The numerical studies based on the derived coupling models are applied to various braid constructions and load configurations are imposed on the tertiary circuit to assess the relative importance of each coupling parameter. From these studies, it is shown that the theoretical treatments which are based on the current dominant coupling give an incomplete assessment of the physical process and, even with a short-circuited tertiary, electric coupling parameters may play an important role in determining the coupling pattern for certain braid constructions.