A characteristic mode analysis of parallel resonances exploiting the finite element scheme
Conference
Zekios, CL, Makris, DG, Maximidis, RT et al. (2015). A characteristic mode analysis of parallel resonances exploiting the finite element scheme
. 179-182. 10.1109/EuMC.2015.7345729
Zekios, CL, Makris, DG, Maximidis, RT et al. (2015). A characteristic mode analysis of parallel resonances exploiting the finite element scheme
. 179-182. 10.1109/EuMC.2015.7345729
A procedure for calculating the characteristic modes series and parallel resonances calculation based on finite element method (FEM), in contrast to the established use of Method of Moment (MoM) is developed. A characteristic mode formulation based on electric currents yields only the series resonances of the analyzed structure. The direct calculation of the parallel resonances becomes feasible with the usage of the equivalent magnetic current characteristic modes. For this purpose the finite element method formulation we have recently established is employed. This is able to handle open-radiating structures even loaded with anisotropic media, it utilizes absorbing boundary conditions for truncating the unbounded domain, while it eliminates the DC and imaginary spurious modes. This is now employed for two alternative approaches. For the first the eigenproblem is reformulated in order to retain only the degrees of freedom of tangential magnetic field on the surface of the metallic parts or the electric currents and thus to yield the related impedance matrix [Z]. In the alternative formulation the tangential electric field over the radiating apertures or the equivalent magnetic currents are retained to yield the structures admittance matrix [Y]. In both cases the characteristic modes scheme separating [Z] and [Y] into real and imaginary parts is employed to formulate respective real eigenproblems. These are solved for the eiegencurrents with particular emphasis in the direct estimation of the series for electric and parallel resonances for magnetic eigencurrents respectively. Example for different antennas at series and parallel resonance are depicted as validations.
