Characteristic mode analysis of open radiating structures based on Finite Element Method

A characteristic mode eigenanalysis exploiting Finite Element Methofi (FEM) features is introduced. In the typical characteristic mode eigenanalysis the Method of Moment (MoM) is utilized (llarringion R. F.. and Mautz J. R., IEEE Trans, on Ant. and Propagat., AP-19, 1971). Moreover, to solve composite structures including both metallic as well as material-dielectric loading, a modified surface integral equation of MoM is demanded (Shafai, IEEE Trans, on Ant. and Propagat., 34, 666–673, 1986). Equivalent electric and magnetic currents are defined in order to take into consideration the interaction between the different homogeneous parts. However, it is proved thai the linear system that occurs, should be solved only in terms of the equivalent electric current that flows on the metallic parts, eliminating all the other currents from the final system (Maximidis R.T., Zekios C.L., Kaifas T.N., Vafiadis E.E. and Kvriacou, G.A., EuCAP 2014, 2822666–2826, 2014).