A Finite Element-Based Characteristic Mode Analysis

A novel Green’s function-free characteristic modes formulation is introduced in this work. The desired impedance or admittance matrix obtained utilizing and appropriately modifying the versatile finite element method. For purpose, generalized eigenvalue problem of electric magnetic field vector wave equation formulated. In case equation, using Schur complement, system reformulated expressed only terms tangential over radiating apertures, retaining equivalent currents. Similarly, current density on metallic surfaces isolated complement. both cases, split into its real imaginary part to yield problem. Key advantage proposed that it does not require evaluation function, thereby study any arbitrarily shaped, multilayered geometry loaded with anisotropic inhomogeneous materials feasible. To prove validity methodology various classical structures, homogeneous, materials, published bibliography are studied. Both eigenvalues eigenvectors compared results show good agreement.