The shielding effectiveness of a conducting plane

In applications where a power distribution conductor carrying a large current is routed near a conducting metal wall or chassis, voltage will be induced in circuits “grounded” to the opposite side of the wall. The effectiveness of the wall in shielding the grounded circuits from the power circuit is a function of conductor distance from the wall, the current and frequency carried by the conductor, and the conductivity, permeability, and thickness of the wall. Maxwell´s equations are solved for the case of a conductor parallel to a metal plane and the shielding effectivenss is expressed as the ratio of two integral equations. The expression is evaluated numerically by digital computer and is presented as sets of curves for appropriate values of the independent variables.