Electromagnetic Shielding

Shielding an electromagnetic (EM) field is a complex and often formidable task and the reason is multi-fold: in fact, the effectiveness of any strategy and technique aimed at the reduction of the EM field levels in a prescribed region depends strongly upon either the source(s) characteristics and the shield topology and materials.

A variety of standards are adopted for the measurement or the assessment of the performance of a given shielding structure, but, unfortunately, all of them prescribe very specific conditions for the measurement set-up, yielding to results that are often useless even in only slightly different source or system configurations.

The research group (S. Celozzi, R. Araneo, G. Lovat) has investigated almost all the aspects involved in a shielding problem:

• • Materials: linear or non-linear (ferromagnetic), periodic (metamaterial), dispersive or optically transparent shields

  • Analysis methods: codes and procedures for the analysis in the frequency (FEM, MoM) or the time-domain (FD-TD, FE-TD, FIT)

  • Figures of merit: new parameters to quantify the performance of any shielding configuration, in the frequency and the time domain, accounting for the actual field distribution in the protected volume and not only at given prescribed positions as requested by current standards

Special configurations like multiple shields (even non-linear), thick apertures, active shielding, loaded enclosures have been also considered and analysed by means of innovative methods.

The book Electromagnetic Shielding, authored by

• • Salvatore Celozzi

  • Rodolfo Araneo

  • Giampiero Lovat

has been published in 2008 (in 2009 the chinese version).

Details on the contributions given by the research Group to shielding theory and practice are described in more than 50 publications presented on this challenging topic.