Uniform Two-Step Method for the FDTD Analysis of Aperture Coupling [EM Programmer's Notebook]


A uniform two-step technique is proposed for the Finite-Distinction Time-Domain (FDTD) analyses of the coupling of each long and short apertures with zero or finite depth. The aperture-field singularity is initial studied in the form of the field distribution and the aperture coefficients derived from the numerical integral of the connected fields. The dramatic field singularity and therefore the coefficients are mainly determined by the aperture's width and depth, and additionally by the aperture's end-edge result. To provide an correct modeling of the aperture while not requiring huge computational-resource usage, a high-resolution customary FDTD simulation of the aperture finish-edge space is used at the first step, and then the electromagnetic field singularity is used to derive the aperture coefficients from a numerical integral. At the second step, the coefficients are totally included into the contour-path laws to derive the FDTD updating equations for the fields near the aperture. Numerical results validated that the proposed technique is an economical simulation of the aperture coupling.

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