Fast solution of volume-surface integral equation for scattering from composite conducting-dielectric targets using multilevel fast dipole method
This article presents a fast solution to the volumesurface integral equation for electromagnetic scattering from three-dimensional (3D) targets comprising both conductors and dielectric materials by using the multilevel fast dipole method (MLFDM). This scheme is based on the concept of equivalent dipole-moment method (EDM) that views the RaoWiltonGlisson and the SchaubertWiltonGlisson basis functions as dipole models with equivalent dipole moments. In the MLFDM, a simple Taylor's series expansion of the terms R-alpha (alpha = 1, -1, -2, -3) and (R)over-cap(R)over-cap in the formulation of the EDM transforms the interaction between two equivalent dipoles into an aggregationtranslationdisaggregation form naturally. Furthermore, benefiting from the multilevel grouping scheme, the matrix-vector product can be accelerated and the memory cost is reduced remarkably. Simulation results are presented to demonstrate the efficiency and accuracy of this method. (c) 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012.
multilevel fast dipole method (mlfdm) equivalent dipole-moment method (edm) electromagnetic scattering (em) volume-surface integral equation (vsie) method of moments (mom)