Numerical calculation on electromagnetic wave reflection by plasma-covered structures

We present real-time status of the electromagnetic (EM) scattering by the plasma-covered perfectly conducting structures, e.g., metal plate and metal cavity, using the two-dimensional finite-difference time-domain (FDTD) method. The absorption and refraction by plasma of such progresses are analyzed, in order to verify the feasibility and validity of the plasma stealth for cavity structure. The variations in their return loss as a function of electron density of plasma and plasma collision frequency are also presented. For plasma-covered metal cavity the return loss is found to be significant, even when it is slight for plasma-covered metal plate. The appropriate parameter regimes of plasma can be chosen for more efficiency design.