An Approximation to the Asymmetric Strip-Line Coupling Coefficient

Abstract—In the design of magnetic film memories and high-speed printed wiring systems, it is often necessary to estimate the coupling between adjacent conductors which are, in effect, strip lines with asymmetric ground planes. No solution to this problem exists in the literature. An heuristic approximation is found, and validated experimentally, which allows a very simple calculation (over the resultant coupling range of 0.1 to 20 percent) to have an error of less than 25 percent. This is, in general, adequate for such purposes.