The treatment of surfaces which are curved or which are not parallel to the co-ordinate axes using the finite difference time domain (FDTD) method is notoriously problematic. The Letter describes a technique which is general, comparatively simple and requires negligible computational overhead. Results are given for the example of a circular cylindrical cavity resonator which show good agreement with analytical formulas.
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C.J. Railton (1993) studied this question.
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