Showing papers by "Nathan Ida published in 1999"

Selection of the surface impedance boundary conditions for a given problem

Abstract: It is well-known that the surface impedance boundary conditions (SDBCs) are classified by their order of approximation. In the present paper, universal relationships between characteristic values of the problem are proposed considering the order of approximation so that the SIBCs, best suited to a given problem, can be easily selected. The methodology is applicable to the time-frequency domain linear and nonlinear SIBCs. Numerical examples are included to illustrate the methodology.

Computation of magnetostatic field using second order edge elements in 3D

Abstract: Several second order edge elements have been applied to solving magnetostatic problems. The performances of these elements are compared through an example of magnetic circuit. In order to ensure the compatibility of the system equations and hence the convergence, the current density is represented by the curl of a source field. This avoids an explicit gauge condition which is cumbersome in the case of high order elements.

Biorthogonal wavelet analysis on 2D EM scattering from large objects

Abstract: This paper investigates the potential advantages of wavelet analysis for large scale problems in EM scattering. A biorthogonal wavelet-based method of moments (MoM) is used in analyzing 2D EM scattering from a conducting structure. Numerical examples show that wavelet-based MoM is especially suitable for the analysis of large problems in the sense that the sparseness of the resulting matrices becomes more apparent with increase of the electrical size of scatterers.