A new technique for the scattering problem of the electrical large body wish an open cavity -Generalized Combined Field Integral Equation (GCFIE) technique is presented. In GCFIE, both the electric currents and the magnetic currents are operated by just the same CFIE Integral operator. Before applying GCFIE, the magnetic currents on the aperture of the cavity had been solved by CS+ABIM (Connection Scheme and Approximate BIM) mentioned in this paper. Thus the only unknowns in GCFIE are the equivalent electric currents on the outer surface of the body whose aperture had been closed by electric conducting wall. Subsequently, MLFMA is applied directly to efficiently calculating the surface electric currents in GCFIE. Several numerical results are presented, demonstrating the accuracy, efficiency and practicability of GCFIE technique.
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