A plane busbar impedance calculation using Maxwell´s equations

The parasitic inductance of a busbar becomes an important problem of fast switching devices in power electronics. Planar conductors, with a thin insulator sandwich between them, comprises a transmission line and provides an excellent means of reducing the stray inductance. This paper analyses the impedance of a planar busbar using Maxwell´s equations in cylindrical coordinates and gives an equation for busbar impedance at low and high frequencies, in terms of parameters such as material properties and dimensions.