Some restrictions for the representation of electro-magnetic systems as transmission-line coupled networks

In this paper we consider electro-magnetic systems where model complexity can be reduced by means of network and transmission line theory. However, the modeling concepts are derived under certain conditions from Maxwell's equations. We will discuss the restrictions regarding the interconnections of networks and transmission lines that can be used for the development of models of electromagnetic systems with a reduced complexity. Furthermore, we show the relationship between the magnetic field of wires calculated by Biot-Savart's formula and transmission line theory.