Abstract
The method of asymptotic waveform evaluation (AWE) is applied to the finite-element analysis of electromagnetic scattering problems. The finite-element mesh is terminated using a perfectly matched layer (PML), an absorbing boundary condition (ABC), or their combination. It is shown that the finite-element method (FEM) in conjunction with AWE can predict the radar cross section (RCS) over a frequency band whose bandwidth is highly dependent on the size of the scatterer. For a given order of AWE, the bandwidth decreases when the size of the scatterer increases. A simple binary search algorithm is described to apply AWE at multiple frequency points to generate an accurate solution over a specified frequency band. Numerical examples are given to demonstrate the performance of AWE in the RCS calculation by the FEM. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 17: 7–12, 1998.
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