Abstract: In order to analyze the radiation behavior of multiple wire antennas mounted on electrically large platforms under limited computer resources, the multilevel fast multipole algorithm (MLFMA) with an adaptive number of levels is implemented. BiCGStab(l) is used as the solver, which combines GMRES(l) and Bi-CG and profits from both. Based on the “physical neighbor”, a novel near-field preconditioner is proposed which improves greatly the convergence of BiCGStab(l). The radiation patterns in the far field of multiple ultra-shortwave antennas mounted on a ship model with the comparative size to real ones are calculated. Numerical results show that the technique is exact and efficient.

Key words: wire antenna, electrically large platform, multilevel fast multipole algorithm, near-field preconditioner, BiCGStab(l)