Applying LF-MLFMA to solve complex PEC structures

In this paper, the wire-surface basis is reviewed. The original hard wire-s urface basis is divided into independent small wire-surface bases. This new wire-surface basis consists of only one wire segment and one triangular pa tch. It simulates more accurately the current distribution near the junctio n, and is easier to form the wire-surface global loop basis for low-frequen cy problems. For complex structures with a global loop basis, LF-MLFMA dire ctly based on a loop-tree basis is inefficient and cannot be applied. To so lve this problem, LF-MLFMA based on a RWG basis, wire basis, and wire-surfa ce basis for efficiently solving low-frequency problems is developed. But t he intrinsic expansion bases are still loop-tree bases. (C) 2001 John Wiley & Sons, Inc.