Conventional finite-difference time-domain (FDTD) methods are veryinefficient for simulations of electromagnetic wave propagation inlarge-scale complex media. This is mainly because of the low-accuracyassociated with the spatial discretization in the FDTD methods. As aresult, even for a moderate size problem, a large number of cells(typically 10-20 cells per wavelength) are required to obtain reasonablyaccurate results. This requirement becomes much more stringent forlarge-scale problems since the dispersion error grows rapidly with thepropagation distance. Recently a pseudospectral time-domain (PSTD)algorithm has been developed which requires only two cells perwavelength regardless of the problem size. In terms of spatialdiscretization, this method is an optimal time-domain solution since ithas an infinite order of accuracy in the spatial representation. For aproblem with structures much smaller than the smallest wavelength, thePSTD algorithm still provides high accuracy up to a much higher spatialfrequency than FDTD methods. In addition, the only error introduced inthe PSTD algorithm is the temporal discretization. Unlike the dispersionerror in FDTD methods, this error is isotropic and does not increasewith the scale of the problem. In this work, we apply the PSTD method tocharacterize the electrical performance of electronic packages. Inparticular, it is used to investigate the effects of enclosure resonanceand electromagnetic interference
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