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This white paper discusses simulations of antennas on a large airplane for cases in which the inclusion of creeping waves is important: antenna patterns that include the shadow region of the fuselage and coupling between antennas on opposite sides of the fuselage. Results obtained with the asymptotic method Faceted Uniform theory of Diffraction show good agreement with those obtained with the rigorous Multi-Level Fast Multipole Method.
In the projects in the zip file, I sometimes used near-field equivalent sources and receivers. While those are valuable, I want to emphasize that even more value lies in Feko's ability to apply hybrid MoM/fUTD to installed antennas, without changing the geometry in any way. The Method of Moments can be applied to the antennas themselves, while Faceted UTD is applied to most of the airplane. The mesh elements of the two solver domains touch, because the full model has one geometry with one mesh. An example model is attached (Version 2025.1). Out of an abundance of caution,the Faceted UTD mesh s a lot finer than it needs to be. Nevertheless, the simulation of four antennas at 1 GHz on a large airplane runs in a matter of minutes on a modest laptop PC.
