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| Fast Calculate the RCS of Electrically Large Cavity by IPO+FMM Combined with the GRI and Connection Technology |
| Luo Wei; Gao Zhen-ping; Zhang Huai-wu |
| Dept. of Microelectronics and Solid-State Electronics, UEST of China, Chengdu 610054, China |
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Abstract The method combined IPO, FMM, RPFMM, FaFFA can rapidly solve the scattering of three-dimensional cavity. In this paper, the Generalized Reciprocity Integral(GRI) method is applied to treat the cavities with termination. The cavity is divide into two different parts by a surface St which is located sufficiently close to the termination, the front section (typically simple and smooth) is analyzed by a hybrid method which IPO combined with FMM, RPFMM and FaFFA, the termination can be analyzed independently. To solve the deep cavities and improve computing speed the front section of cavity is subdivided into several sections, and each of them is analyzed independently using the IPO combined fast computing method from the rest of the cavity. Then a connection scheme is used to get the scattering field radiated by the front section at the surface St . Finally the RCS of the cavity is get by the GRI at surface St. The numerical results show the hybrid method is accurate enough and can improve effectively computing speed。
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Received: 19 January 2006
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2007, Vol. 29 
