Analysis of scattering from serrated edge plate on aircraft with MLFMA

Combined field integral equation (CFIE), multilevel fast multipole algorithm (MLFMA) and conjugate grads method (CGM) were employed, and a modified truncation number had been presented to gain the precise scattering from objects efficiently and stably. It was exemplified that this new method could reduce memory and computation time at the same accuracy by its application to the bistatic radar cross section (RCS) of sphere. Scattering from serrated edge plates was analyzed. The problem how the RCS reduction of serrated edge plate changes against straight edge plate was discussed in different angle range. The connection between the RCS reduction and incident frequency was also discovered. Results show that the RCS reduction of serrated edge plate increases sharply when the incident frequencies become larger, the RCS reduction effect in vertical polarization is greater than that in horizontal polarization. This conclusion can find its application to improve the stealth performance of aircraft.