Improving the coupled‐mode method by means of step functions: Application to partial‐height isotropic or anisotropic dielectric parallel‐plate waveguides

The main drawback of the coupled-mode method is the poor convergence and accuracy of the discontinuous field components. The greater the discontinuity, the worse these problems become. This Letter presents an improvement of the method, allowing this drawback to be minimized. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 408–414, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10337