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An FDFD eigenvalue formulation for computing port solutions in FDTD simulators

At the pre‐ and post‐processing stages of a finite‐difference time‐domain (FDTD) simulation, important tasks are carried out that require knowledge of the port data (propagation constants, fields, impedances, and so on) of the problem structure. This paper introduces a 2D finite‐difference frequency‐domain (FDFD) eigenvalue formulation specifically tailored for the computation of port data to be used in conjunction with the 3D‐FDTD method. A key feature of the proposed FDFD scheme is that it leads to the same numerical dispersion equation as that of the 3D‐FDTD method. This means that, for a given frequency, the numerical propagation constants and mode patterns calculated by the two methods are identical. This is desirable for preserving the accuracy of the FDTD simulation. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 1–3, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20704