PEC Targets Research Articles

Sparse solution of an integral equation formulation of scattering from open PEC targets

A recently developed compression and sparse solution strategy for electromagnetic problems is applied to integral-equation formulations of scattering from perfectly conducting targets in three dimensions. It is shown that the resulting representations of both the impedance matrix and its inverse are sparse at low-to-moderate frequencies. Limitations and possible extensions of the sparse algorithms are also discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 476–480, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21383

Fast multipole method for scattering from 3-D PEC targets situated in a half-space environment

The fast multipole method (FMM) is extended to the problem of an arbitrary, three-dimensional perfect conductor situated above or below a lossy, dielectric half space. The interactions between basis and testing functions within an FMM cluster, and for nearby clusters, are handled via the rigorous dyadic Green's function, with the latter evaluated efficiently using the complex-image technique. Intercluster interactions are modeled as in the free-space FMM, with the dyadic Green's function approximated via real images and equivalent reflection coefficients; these approximations have proven to be highly accurate. Example results are presented for a large trihedral fiducial target, in free space and above a lossy, dispersive half space, with comparisons presented between the FMM and a rigorous method-of-moments (MoM) solution. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 399–405, 1999.