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Handling of the perfect electric conductor in higher-order FDTD method

The higher-order FDTD method has the advantage of reducing the phase error due to numerical dispersion. One of the main difficulties in applying the higher-order FDTD method to scattering problems is the handling of the perfect electric conductor that is often encountered. When the long stencil of the higher-order spatial difference operation crosses a PEC boundary, erroneous results are obtained if the PEC boundary is not properly handled. This paper presents a scheme efficiently processing the PEC boundary in the S24 FDTD algorithm. Combined with Berenger's original PML, the method gives accurate results compared with those obtained by the original S22 algorithm.