FE-BI formulation for characteristic modes of general bodies

This paper presents a finite element-boundary integral (FE-BI) formulation for determination of the characteristic modes of general bodies. The finite element (FE) method is used to handle the general bodies with composite material, while the boundary integral (BI) method is applied on the boundary of the general bodies to model the open region outside the general bodies. A type of symmetric FE-BI formulation is applied to obtain a generalized Hermitian eigenvalue equation for characteristic modes. Numerical results are provided to validate the proposed FE-BI formulation for characteristic modes.