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A second order in time-fourth order in space modified finite difference time domain algorithm for 3D electromagnetic problems is presented. The algorithm enables the numerical phase error to be minimized, so that it leads to high accuracy with low resolution grids. Good results for long distance propagation in the case of radiation from time harmonic elementary dipole show the advantage of this method with low resolution compared to the previous finite difference time domain methods.

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This paper presents a rigorous analysis of rectangular waveguides partially or completely filled with a longitudinally magnetized ferrite (LMF) slab. In these problems, the interface between the dielectric and the ferrite tn -X -t* -or between the conducting walls and the ferrite represent a -discontinuity problem that requires an infinite expansion of waves in each subregion. The analysis is based on the mode matching and the transverse resonance techniques which are combined in such a way as to provide saving in CPU time and memoly size requirements. The modes in ferrite region have, in general, complex propagation constants in the transverse direction. Numerical examples are given for different cases and compared with the published data.

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