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Despite the robustness that commercial electromagnetic simulators offer, they generally require large computational resources and time and suffer from some shortcomings when dealing with certain more exotic materials and structures. As an alternative, within the SWAT group, we develop efficient computational methods for the analysis and design of radio frequency devices, such as spatiotemporal periodic structures (their elements are repeated in space and time) and reconfigurable elements based on the use of novel materials, such as graphene or liquid crystal. Among the most outstanding methods, we can find: equivalent circuits, modal analysis (mode matching), optical ray tracing and method of moments (MoM).