An examination of the impedance-sheet approximation to a plasma slab

The criteria associated with the use of an impedance-sheet approximation to a plasma slab are discussed for two cases. The first case considers plane-wave propagation through a plasma slab, and the second case considers a plasma-covered slot antenna terminated in a flat ground plane. Curves showing the percent deviation in the transmission loss between the impedance-sheet model and the plasma-slab model are presented for various plasma conditions.