3Felsen L B, Whitman G M. Wave Propagation in timevarying media. IEEE Trans. AP, 1970, 18(2): 242～253.
4Fante R L. Transmission of Electromagnetic Waves into Time-Varying Media. IEEE Trans. AP, 1971,19(3) : 417～424.
5Kozaki S Reflection of electromagnetic wave from a time-varying medium. Electronics Letters, 1978, 14(25) : 826～828.
6Mur G Absorbing boundary conditions for the finitedifference approximation of the time-domain electromagnetic field equations. IEEE Trans. EMC, 1981,23:377～382.
7Berenger J P A perfectly matched layer for the absorption of electromagnetic waves. J ComputationalPhysics, 1994, 114:185～200.
8Sacks Z S, Kingsland D M, Lee R, LeeJ F A perfectly matched anisotropic absorber for use as an absorbing boundary condition. IEEE Trans. AP, 1995,43: 1460～1463.
