ISSN 1002-1027　　CN 11-2952/G2

### Using Multilevel Fast Multipole Algorithm to Analyze Electromagnetic Scattering in Resonance Region of 3-D Complex Objects

WANG Pai, DONG Shuo, ZHOU Lezhu, XIA Mingyao

1. School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871
• Received:2005-05-27 Online:2006-05-20 Published:2006-05-20

Abstract: Multilevel fast multipole algorithm (MLFMA) and preconditioned generalized minimal residual (GMRES) method was employed to analyze electromagnetic scattering characteristics in resonance region of 3-D complex objects in this paper. For the problem of scattering in resonance region, such as 5 to 10 wavelengths, MLFMA needs much less core memory and computing complexity than moment method and fast multipole method. How to choose the optimal parameter L, the multipole number, is discussed. Preconditioned GMRES is used to solve the MLFMA matrix equation with a large number of unknowns, which proves to be more efficient than conventional conjugate gradient (CG) method. Finally, electromagnetic scattering in resonance region of 3-D complex bodies including the missile model and stealthy airplane model are analyzed.