Solution box: SOLBOX-18: Near-field scattering from electromagnetically large boxes

High-frequency techniques [1] are excellent tools for analyzing electrically large structures, especially if their geometries do not possess complex interactions, e.g., those caused by resonances. However, as the technology (both in terms of software and hardware) develops, it becomes possible to solve increasingly large problems via full-wave solvers without resorting to approximations and assumptions. Specifically, full-wave methods enable the analysis of electrically large objects with more direct applications of Maxwell's equations, while fundamental mechanisms, such as diffractions, reflections, and ray-like behaviors, are expected to be revealed as simulation results rather than being introduced as initial assumptions. Such full-wave solvers not only supply reliable simulations for arbitrarily complex structures, but also support high-frequency techniques by providing reference results for further analyses.