The propagation of electromagnetic (EM) fields through a rotating circular hollow lossless dielectric cylinder has been numerically simulated in two dimensions and the numerical results were presented in this paper. The method of characteristics (MOC) is used to numerically solve the time-domain Maxwell equations. The passing center swing back grids (PCSBG) technique was devised and introduced in collaboration of MOC in a modified O-type grid system. The PCSBG scheme resolves the difficulty of the distortion of grid cells caused by the rotational movement of the object. There arc two types of cylinder were used in this work. They are made of dielectric and impedance matching materials, illuminated by Gaussian EM pulses as the excitation sources, and may either be at rest or rotate at extremely high angular frequencies for better observation of its effects on the EM fields. The presented computational results, demonstrated in a side-by-side manner for clear comparisons, are the electric field distribution over the whole numerical domain and the EM fields sampled at the center of cylinder.
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