Conference Agenda

We propose a stable and efficient approach to extract the frequency-dependent parasitic effects of a CAD design with the finite element method. An equivalent circuit of the parasitics for the use in transient circuit simulations is generated by applying vector fitting to the results of a magnetoquasistatic simulation, and combining the exported electric network with capacitances computed in an electrostatic simulation. The separate consideration of resistive and inductive, and capacitive effects ensures stability also at low frequencies by avoiding impedance or scattering matrices that otherwise would become ill-conditioned when approaching the DC point. A comparison of measurement and simulation results validates the method for the example of a common mode choke.

In order to investigate the influence of Maxwell force and magneto strictive effect on the vibration characteristic of iron core under DC bias, a coupled magneto-mechanical model is established. The harmonic balance finite element method is used to calculate the magnetic and mechanical field, and the magnetic vector potential and displacements are solved in the frequency domain. Experiment is carried out on twin laminated core model to measure the magnetic field and vibration under different magnetizations. The proposed method is verified by comparing the computational results with the measured ones based on the two different model.

A method for the estimation of stability criterion in the space-time finite integration method using the sub-grid technique is developed. Numerical and analytical dependent domains are compared to estimate the stability limit. Space-time subgrids locally refined with two, three and four divisions are examined. The stability limit based on the proposed method almost agrees with the numerical experiment.

In the finite-difference time-domain (FDTD) technique, the path integral (PI) form of Maxwell's equations has been proven a very instructive means for the accurate treatment of smooth-surface objects. On the contrary, for the nonstandard (NS) FDTD method, due to its differential implementation solely on orthogonal grids, it is necessary to use fine cells for curved surfaces. To avoid this issue, an integral representation form, equivalent to the differential 3D NS-FDTD rendition, is developed. By adopting a dual PI model with an improved E-field manipulation on complementary paths, the new scheme is found to be rigorous and simple, as verified by diverse numerical examples. Thus, the featured PI concept can significantly enhance the NS-FDTD analysis of arbitrarily-shaped structures on coarse meshes.

his paper investigates the distribution of the currents in a 2D metamaterial realized with coupled-resonant circuits, when it is excited by a voltage source in an arbitrary cell. Possible different models for the analysis of these structures are illustrated and the effect of the approximations they introduce on the current values are shown for a 5 × 5 array. Furthermore, the matching of the boundaries of the metamaterial is discussed and possible values for the matching impedances have been numerically calculated for arrays with a small number of resonators.