A modification to berenger's PML equations for FDTD method

摘要

In this paper. Berenger's twelve split-formtime-domain-PML equations have been reduced to only six unsplit-form equations by rearranging the constitutive parameters of the PML region. The modified PML equations have two advantages, viz., a) computer time and memory savings and, b) ease of implementation. The disadvantage is that the interface between free space and PML region is no longer perfectly reflectionless. Methods for reducing this effect are suggested. Numerical results show that the accuracy of the modified PML equations can be very close to that of the original PML equations.