A partitioned iterative method for bistatic scattering analysis of PEC cavities with internal–external incident field decomposition

A partitioned iterative method is proposed for the scattering analysis of thin-walled PEC cavities under plane wave excitation. The method decomposes the excitation into internal and external components separated by the cavity aperture, enabling independent iterative calculations of induced currents on the inner and outer cavity walls. Iterative calculations for the induced currents in both parts are independent, and total scattered fields are synthesized from both parts. This partitioned iterative method is particularly applicable to solving bistatic scattering problems, achieving higher accuracy compared with the Iterative Physical Optics (IPO) method and Physical Optics (PO) in the case of cavity and duct models. Numerical results validate the accuracy of the method and the necessity of employing the partitioned iterative strategy.