Ricerc@Sapienza

Electromagnetic (EM) shielding in the presence of transient waveforms has recently obtained a renewed interest because of the ever-increasing consciousness that almost all the sources of interference (EMI) are characterized by a time-domain trend. Typical EMI are due to lightning electromagnetic pulses, electrostatic discharges, switching operations and, recently, intentional disturbances aimed at provoking malfunctioning conditions or failures.

The associated waveforms are very different as to peak values, energy content and induced effects (proportional to time derivative of the relevant EM field components). Also the victims may differ as to their susceptibility to peak values, induced effects (voltages) or to the energy delivered to them. For this reason, in the recent past a careful attention has been paid to the introduction of appropriate figures of merit capable of quantifying the performance of shielding structures against transient EM fields.

The configurations of actual shielding structures are typically three-dimensional and in closed shape: most of the available literature oversimplifies the geometry and the electromagnetic properties of the materials yielding to rough approximations; most of the analysis methods focuses on the CW behavior and on local (as suggested by all the available standards) and not on the global performance (i.e., in the whole shielded domain).

In the past, this research team has developed analysis procedures for the extraction of global figures of merit for the time ¿ domain shielding, obtaining also the analytical exact time domain solutions in several canonical configurations, useful as benchmark or limit solutions.

The goal research project is twofold:
1. it is of interest to extend the suitability of the analytical solutions to 3-D configurations ,
2. the main goal is developing a design procedure or at least design guidelines for the realization of shielding structures with prescribed levels of performance.