*3.3.2 Propagation progress along the edges*

To observe the propagation progress/process along the edges, the EM response signals versus time and versus distance *l* from the source at consecutive points along the edges are examined. Structural effects on the signals and/or general propagation process are analyzed based on the changes in cluster shape or emergence of scattering signals in time domain versus *l*. Specifically, the analysis quantities are the EM vector magnitudes and dominant vector components along the curves *l*. An adequate information about the field intensity can be provided by the EM vector magnitudes, while a change of sign in the dominant vector components can indicate a reversal in vector direction. To eliminate the abrupt difference in intensity at transition points along the edges, the analysis quantities are normalized according to peaks of the first cluster. The normalized signals on the slot line and Vivaldi slot versus time and *l* are shown in **Figures 15** and **16**. These show that the signal tendencies can be seen clearly with increasing of *l*.
