Circuit model for Transverse EM waves

Circuit models are often used to describe a system in a simply way, lumping its properties in few variables and allowing to solve ElectroMagnetic (EM) problems without the need to deal with the complete set of Maxwell´s equations. Even if circuit theory is a powerful design tool it has some drawbacks, since the electric field E→ is approximated as conservative and thus the propagation of Transverse EM waves is neglected. However, in this paper we present a circuit model suitably designed to describe also those propagation effects. For sake of simplicity, we consider the problem of the two radiating infinite parallel wires and introduce the concept of “impedance coupling” in order to treat transverse waves. Since EM fields propagate in “empty” space, we are going to interpret the potential vector A→ as a current i_A flowing in circuit elements.