The paper build the 1D model of metallic target coated with un-magnetized plasma and auxiliary differ- ence equation finite different time domain（ADE-FDTD） algorithm is applied to calculate the attenuation of Terahertz （THz） wave in plasma. The relation between the frequency of the THz electromagnetic （EM） wave and the attenua- tion caused by plasma collision frequency, electron density, density distribution is analyzed. The results demonstrate that the attenuation caused by plasma is small when incident wave In THz Frequency band. The TH...
