On the interaction between electric and magnetic currents in stratified media

The presence of both electric and magnetic current elements embedded in stratified media is necessary to model many problems of interest in current integrated circuit and printed antenna technology. The integral equation formulation as applied to these problems is reviewed. Special attention is given to the Green´s dyadic for the electric field generated by a magnetic current element. The fact that spectral-domain transmission line Green´s functions for a multilayered structure are closed form integrable along the axis normal to the stratification is exploited to greatly improve the efficiency and the accuracy of the method. Theory and implementation are demonstrated in two practical problems: 1) arbitrarily shaped apertures in thick conducting screens, and 2) a metallic airbridge over a slot line.