A Novel Mixed-Potential Integral Equation-Based Sub-Structure Characteristic-Mode Formulation

A novel mixed-potential integral equation (MPIE)-based sub-structure generalized eigenvalue equation (SSGEE) for multilayer structure is proposed in this letter. Compared to state-of-the-art sub-structure characteristic mode (CM) formulations based on electromagnetic field integral formulation, the proposed MPIE-based SSGEE significantly reduces computation time and computer memory required. In addition, the proposed MPIE-based SSGEE can also be applied on different parts of a single object, which is well suited for obtaining the radiation characteristic of every radiator in the multiradiator system.