[数值]Comparison of Integral-Equation Formulations for

Abstract—We consider fast and accurate solutions of scattering .hRtQU  
problems involving increasingly large dielectric objects formulated {>Hn:jW<.  
by surface integral equations. We compare various formulations mwutv8?  
when the objects are discretized with Rao-Wilton-Glisson functions, MZ?+I~@  
and the resulting matrix equations are solved iteratively ${e5Ka  
by employing the multilevel fast multipole algorithm (MLFMA). mu2|%$C;$  
For large problems, we show that a combined-field formulation, !l5@L\  
namely, the electric and magnetic current combined-field integral NJCSo(O  
equation (JMCFIE), requires fewer iterations than other formulations i9Eh1A3Y  
within the context of MLFMA. In addition to its efficiency, :JU$6  
JMCFIE is also more accurate than the normal formulations >8|V[-H  
and becomes preferable, esp .. y3':x[d  
7+;.Q  

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Thanks a lot!!