An Improved Physical Optics Technique for Multiple Shielding Electromagnetic Scattering Problems

The traditional physical optics (PO) method is faced with the difficulty of dividing light regions and dark regions for the electrically large scattering problem. To compensate for these shortcomings, an improved PO method is presented in this paper, including multiple shielding or oblique incidence at different angles. Compared with the traditional PO method, this paper provides an important technology on multiple shielding or oblique incidence by three-layer nesting steps. Combining with coarse mesh, refined mesh, and some key projection techniques, this method can effectively deal with the object occlusion. Especially for the complex physical model, the radar cross section can be quickly and accurately solved. As a result, it's helpful to simulate and design different electromagnetic problems.