Reflection and transmission characteristics of frequency selective surface embedded within a thick plasma layer

In this paper, the reflection and transmission characteristics of frequency selective surface (FSS) embedded within a thick plasma is studied. The plasma layer is lossy and dispersive medium and the embedding of the FSS will change the electromagnetic wave propagation very much. The reflection and transmission coefficients of a square patch FSS layer embedding in plasma is calculated utilizing finite-difference time-domain (FDTD) method. Auxiliary differential equation (ADE) is utilized to simulate the dispersion of the plasma. The influence of the plasma and slab's parameter to the reflection and transmission coefficients is investigated. Various parameters of collision frequency, plasma frequency and thickness of plasma are involved to study the influence of these factors. The reflection and transmission coefficient values of different parameters are plotted to compare their effects. The results show that collision frequency reduces the reflection and transmission coefficient. Plasma frequency changes the FSS from low pass filter to band pass filter. Thick plasma slab makes the transmission coefficient oscillate as the variation of incident frequency.