A very efficient analytical approach for electromagnetic field to transmission line coupling in shielded enclosure

In this paper, on approach, which describes the electromagnetic (EM) field coupling with a transmission line (TL) located in a closed rectangular enclosure, has been developed. The metallic enclosure will be assumed ideal (perfectly conducting walls), excited by internal source. The calculation of the EM field generated inside the box is based on previous published work [1]. Our approach consist on using the TL model which combines, on one hand, a lumped-pi circuit model of line [2], on the other hand, an EM coupling model [3]. This type of concept will enable us to study the coupling of the EM field cavity with a TL. The advantage of this approach is to obtain a fast predict of the current at the terminations loads. The obtained results are in good agreement over a wide band of frequency using a full-field simulation based on the finite difference time domain (FDTD) [4].