Abstract
This paper brings forward a simple local approximation flnite-difierence time-domain (FDTD) method for the analysis of short apertures with a flnite thickness. By applying the equivalence principle together with a simple local approximation, the varying fleld distribution is accurately derived. The updating equations for the slot fleld can be derived by casting the fleld distributions into the contour paths containing the apertures. The method has been applied to two problems and the results are compared with the high-resolution standard FDTD simulation results and the measurement results. The accuracy of the proposed method is verifled from the comparison of both the fleld distribution and the time-domain and frequency-domain slot coupling results. It is demonstrated that the local approximation is highly e-cient and timesaving, and the present method is stable, numerically and computationally e-cient.
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