Abstract
In this paper, the modified fast directional multilevel algorithm (FDMA) is presented for analyzing microstrip patch. The FDMA has been successfully applied to analyze scattering in free space and then it was extended to solve mircrostrip problems. The quad-tree structure is used in this method, which is the same as that in fast multipole method. In our method, the finest level group size can be set smaller than 0.2λ without suffering from subwavelength breakdown. The resulting algorithm has the memory requirement and the CPU time per iteration proportional to O (NLogN), where N refers to the number of unknowns. Numerical results of microstrip structures are presented to show the efficiency of this method
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