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J.1.1: Sesión especial: Metamateriales, metasuperficies y otras estructuras periódicas I
Hora:
Jueves, 04/09/2025:
8:45 - 10:15
Presidente de la sesión: Francisco Mesa, Universidad de Sevilla, España Presidente de la sesión: Eva Rajo Iglesias, Universidad Carlos III de Madrid, España
Lugar:EUTYCHES
253
Ponencias
8:45 - 9:00
Traslación de frecuencia con metasuperficies moduladas espacio-temporalmente
Lira-Valdes, Tomas; Abdo-Sanchez, Elena
Universidad de Malaga, España
This study numerically investigates frequency translation in a metasurface with spatiotemporal refractive index modulation using the Finite-Difference Time-Domain (FDTD) method. A TE-polarized monochromatic wave undergoes diffraction into spatial and temporal harmonics, dictated by the modulation parameters. Simulations illustrate frequency translation and analyze the effects of spatial period, modulating waveform, and metasurface thickness. The results align with the theory that classifies harmonics as evanescent or propagating and determines their diffraction angles.
9:00 - 9:15
Análisis de Estructuras 1D-Periódicas Abiertas mediante Matrices de Transferencia Multimodales
1Universidad Politecnica de Madrid; 2University de Siena; 3Universidad de Sevilla, España; 4Royal Institute of Technology, Estocolmo
Este trabajo explora y valida la aplicación del método de la matriz de transferencia multimodal (MMTMM) para el análisis preciso de estructuras unidireccionalmente periódicas radiantes de ondas de fuga. El método ofrece una metodología sistemática para calcular los números de onda complejos de los modos de fuga propios e impropios utilizando la matriz de transferencia multimodal de una única celda unidad, que puede obtenerse con software comercial. La versatilidad y precisión del MMTMM se validan con estructuras periódicas complejas que soportan ondas superficiales y que se utilizan habitualmente en antenas de fuga, incluyendo superficies corrugadas y tiras metálicas sobre dieléctricos. Los resultados se contrastan con soluciones obtenidas mediante el método de los momentos. La fiabilidad del método queda demostrada por la convergencia de las soluciones de múltiples simulaciones. El MMTMM demuestra ser eficiente, preciso y fiable para obtener la constante de atenuación y el desfase de estructuras abiertas 1D-periódicas.
9:15 - 9:30
Teoría, Diseño y Verificación Experimental de Antenas Leaky-Wave Basadas en Metasuperficies con Síntesis de Iluminación
Mateos Ruiz, Pablo; Abdo Sánchez, Elena
Instituto TELMA, Universidad de Málaga, España
This contribution presents a rigorous methodology for the design of parallel-plate leaky wave antennas (LWAs) based on bianisotropic Huygens' metasurfaces (BHMS). A slowly varying amplitude approximation (SVAA) is employed to overcome previous limitations in the leakage factor value, enabling a precise control of the aperture field distribution and, consequently, radiation pattern shaping capabilities. A field-based semi-analytical algorithm is used to synthesize the BHMS multi-layered unit cells, taking into account inter-layer near-field coupling effects without full-wave optimization. The potential and efficiency of this approach is validated through the fabrication and measurement of two prototypes with different characteristics, showing strong correlation between theoretical, simulated and experimental results.
9:30 - 9:45
Superficie Inteligente Reconfigurable Basada en Ranuras para Comunicaciones Inalámbricas
This work presents the design, simulation, and experimental validation of a 1-bit Reconfigurable Intelligent Surface (RIS) based on slots controlled by PIN diodes, which modify the phase of the reflected wave. Unlike other solutions based on MEMS, varactors, and similar technologies, this approach offers a simpler and more scalable design, allowing expansion to higher-bit configurations without requiring major architectural changes.
The fabricated prototype demonstrates that this RIS can effectively control beamforming and signal direction. In contrast to traditional designs requiring visible biasing networks, the biasing network for the diodes is placed beneath the ground plane that contains the slots, which prevents electromagnetic interference and significantly simplifies integration. Simulations have been validated through experimental measurements, confirming efficient phase control.
9:45 - 10:00
Diseño de Superficies Selectivas en Frecuencia de Doble Banda con Polarizaciones Ortogonales
Hidalgo, Francisco J.1; Boix, Rafael R.1; Camacho, Miguel1; Córcoles, Juan2
1Universidad de Sevilla, España; 2Universidad Politécnica de Madrid, España
This conference paper introduces a procedure for designing dual-band frequency selective surfaces (FSSs) with orthogonal linear polarizations. The FSS consists of a four-layered dielectric substrate with five metallization levels. The metallization levels alternate between periodic arrays of patches and periodic arrays of apertures. In the lower passband of the designed FSS only the polarization in the x direction is transmitted, while in the upper passband only the polarization in the y direction is transmitted. In a first step, the dimensions of the FSS are adjusted to obtain third order filtering responses. In a second step, a combined optimization in both bands is performed. The final design presents bandwidths of 20 % in the lower band (centered at 7 GHz) and 31 % in the upper band (centered at 12.6 GHz). It has a polarization isolation of 20 dB and its response is stable up to 30 degrees.
