MESH TRUNCATION IN THE FINITE-ELEMENT FREQUENCY-DOMAIN METHOD WITH A PERFECTLY MATCHED LAYER (PML) APPLIED IN CONJUNCTION WITH ANALYTIC ANDNUMERICAL ABSORBING BOUNDARY-CONDITIONS

The perfectly matched layer (PML) concept, introduced by Berenger with the aim of synthesizing an absorbing boundary condition (ABC) for the finite-difference-time domain (FDTD) method, is modified and extended to finite-element frequency-domain (FEFD) applications. The governing equations that characterize this approach do not require the splittin g of the field components of interest, nor do they invoice negative co nductivity parameters. The PML-type medium is employed together with a nalytic and numerical ABCs as its termination to obtain an improved bo undary condition for the FEFD method at a limited increase in computat ional cost. (C) 1995 John Wiley & Sons, Inc.