Formulation of FE-BI equations with domain decomposition method for calculation of em scattering from cavities

In this paper, a new formulation of finite element-boundary integral (FE-BI) equation with domain decomposition method is proposed to compute the electromagnetic (EM) scattering from cavities. The computational domain is divided into two parts: cavity and non-cavity domains. Tetrahedral elements with higher-order and lower-order vector basis functions, which are non-conforming elements, are used in the cavity and non-cavity domains, respectively. The application of Robin transmission condition at the aperture of the cavity relates the fields in the interior and exterior regions of the cavity. Preliminary numerical results obtained show that the proposed method is suitable for this class of problems.