Numerical and experimental generated data during project https://doi.org/10.1109/TAP.2025.3618844

The dataset was generated during a project aimed at developing an analytical and numerical investigation of the e ective permittivity of dielectric slabs perforated with elliptical and capsule-shaped cylindrical microstructures arranged in square and triangular lattice configurations. Based on a quasi-static approximation, the 2-D Mori–Tanaka mixing model is employed to calculate the anisotropic e ective permittivity tensor by incorporating direction-dependent depolarization factors for both parallel and perpendicular field orientations. An elliptical-based microstructure is first analyzed, followed by the introduction of a capsule-shaped alternative that simplifies fabrication while maintaining comparable electromagnetic (EM) properties with over 95% accuracy. The EM behavior of both geometries is validated through full-wave unit cell simulations across a broad frequency range (5–48 GHz) and porosity levels.