volume | PIER Journals

Abstract

This work presents the design, characterization, and experimental validation of waveguide-fed metasurface antennas based on complementary electric-LC (CELC) resonators. The magnetic polarizability of individual unit cells was extracted using the Incremental Difference Method, enabling physically grounded complex weighting of each metasurface element without the need for external feeding networks. Two CELC geometries (square and circular) were investigated under identical WR340 waveguide excitation. The circular CELC exhibited a smoother current distribution and a more uniform polarizability profile, as observed in the polarizability-mapping results, whereas the square CELC provided a slightly higher gain owing to its sharper magnetic resonance. Lateral-slot perturbations were introduced as a simple geometric modification to overcome the intrinsic narrowband nature of Lorentz-type resonators. The simulated and measured results confirm a significant improvement in impedance bandwidth, reaching 194 MHz (simulated) and 189 MHz (measured) for the square slot geometry, and 222 MHz (simulated) and 209 MHz (measured) for the circular slot geometry. Radiation-pattern measurements in an indoor antenna chamber showed good agreement with full-wave simulations, validating the polarizability-based weighting mechanism and the overall metasurface antenna model. The results demonstrate that magnetic-polarizability mapping combined with geometry-tailored perturbations provides an effective and experimentally verified approach for compact and bandwidth-enhanced metasurface antenna design.

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Dr. Ivan Eduardo Diaz Pardo

Dr. Carlos Arturo Suarez Fajardo

Professor Juan Domingo Baena Doello

Dr. Hector Guarnizo