Transmission properties of slits on stacked thick plates using a three-wave FDTD approach

To analyze the scattering properties of slits on single or stacked metal plates of finite thickness, a three-wave FDTD approach is applied. By using this scheme, we calculate the magnetic surface currents on both sides of a slit on a thick plate and the transmission cross sections of slits on single or thick plates. The numerical examples are given to demonstrate the accuracy of the method. In addition, we observe that the shift of the two slits and the inserted dielectric between the two plates can change the shielding effectiveness. This algorithm is also available for analyzing the scattering and transmission of slits with different shape, location and dielectric media filled on multiple metal plates.