Unsplit-field perfectly matched layer implementation for FETD in dispersive media

摘要

The scattering of target in dispersive soil is simulated under Gaussian pulse excitation. 2D PML perfectly matched layer (PML) absorbing boundary condition is proposed to truncate computation space for Finite-Element Time-Domain (FETD) in dispersive media. Numerical examples show that the proposed PML-FETD approach has small reflection errors and no late-time instability for simulations. The PML formulations for Debye dispersive are derived. The scattering results excited by Gaussian pulse are calculated. The numerical results of Vector and Nodal based Finite-Element Time-Domain with PML are compared with Finite-Difference Time-Domain. Good agreement is observed.