Experimental investigation on time-domain testing of shielding effectiveness of composite materials against EMP

The shielding effectiveness (SE) of materials with different thickness is experimentally investigated using an improved time-domain testing system of SE and a window on a shielding enclosure in a GTEM cell. Experimental results show that the proper test position of transient electric probe (E-probe) within the enclosure is determined to make the system capable of finding out the maximum peak value of pulsed electric field inside enclosure. The SE test experiments for several shielding composite materials fabricated using nickel-plated carbon fiber proved that the SE of materials for electromagnetic pulse (EMP) is highly dependent on the thickness of materials and the proposed testing method can obtain high repeatability, and thus it can be used as a standard test system to assess the shielding effectiveness of materials for pulsed electric field.