Title :
Extending PML absorbing boundary condition to truncate microstrip line in nonuniform 3D FDTD grid
Author :
Li, Tong ; Sui, Wenquan ; Zhou, MengChu
Author_Institution :
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
fDate :
9/1/1999 12:00:00 AM
Abstract :
The Berenger´s perfectly matched layer (PML) absorbing boundary condition is applied to terminate a microstrip line with metal strip and multilayer dielectric media extending into the PML regions. In order to handle the inhomogeneous properties of the PML layers better, the integral form of the Maxwell´s equations, approximated by central-difference expressions instead of exponential-difference expressions, are utilized to deduce the finite-difference time-domain (FDTD) equations for updating field components inside PML media. The derived formulas are proven to be flexible and convenient for generating and handling the PML layers in a nonuniform FDTD grid. Simulation results show that the proposed multilayer PML boundary condition can effectively absorb the outgoing wave with at least -80-dB reflection coefficient under a complicated boundary situation
Keywords :
Maxwell equations; circuit simulation; finite difference time-domain analysis; microstrip circuits; microstrip lines; Berenger´s perfectly matched layer; Maxwell´s equations; PML absorbing boundary condition; central-difference expressions; inhomogeneous properties; metal strip; microstrip line; multilayer dielectric media; nonuniform 3D FDTD grid; outgoing wave; reflection coefficient; Boundary conditions; Dielectrics; Finite difference methods; Integral equations; Maxwell equations; Microstrip; Nonhomogeneous media; Perfectly matched layers; Strips; Time domain analysis;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
