Abstract
The FE–BI (finite element–boundary integral) method is used for the characterization of an arbitrary-shaped multiaperture-coupled directional coupler between two rectangular waveguides crossing with an arbitrary angle. The method is shown to be much more effective than the ordinary FEM for the structures under consideration. The computation time is compared with that of the ordinary FEM. The experimental data for Moreno coupler are compared with the theoretical prediction, and a good agreement is obtained. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 43–46, 1998.
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