Abstract:

A composite materials with negative permittivity were selected as the research object. It was presented how to use Finite Difference Time Domain (FDTD) method to numerically analyze the transmission and reflection characteristic of the composite materials. The simulation results were compared with the experimental data for testifying the feasibility of this method. Based on this, the shielding effectiveness of the composite materials to ultra wideband EMP (UWB) and high power microwave (HPM) were analyzed. The simulation result shows that the composite materials have stong shielding effectiveness to UWB and HMP . It is helpful to apply composite materials in the domain of electromagnetic shielding.

Key words: composite materials, negative permittivity, transmission and reflection characteristic, electromagnetic shielding