Programa del congreso

This work presents the preliminary design of a unit cell antenna operating in the L-band (1090 MHz), intended for satellite-based reception of Automatic Dependent Surveillance–Broadcast (ADS-B) signals. The antenna is conceived as a building block for future array configurations within the framework of the SATERA project, an initiative funded by the Horizon Europe programme to enhance air traffic surveillance via satellite technologies. Key performance parameters such as gain, bandwidth, and radiation pattern are evaluated through full-wave simulations. The results demonstrate the feasibility of the proposed concept and provide a solid starting point for its integration into the overall satellite-based ADS-B reception system.

This paper presents the design of a semi-transparent square-ring patch antenna with a monopolar radiation pattern. The antenna's metallic components are implemented using metallized grids, allowing most visible light to pass through. To minimize losses, the design operates without a substrate and consists of a radiating layer formed by a square ring, centrally fed by a coaxial probe through a small patch, along with a ground plane. These layers are interconnected by four shorting walls made of grids, facilitating the excitation of two conical radiation modes that couple to enable wideband operation. The antenna achieves a monopolar radiation pattern over a 35% bandwidth, with gains exceeding 4.5 dBi and transparency levels between 65% and 80%, depending on the grid implementation and ground plane size. This solution is designed for 3D-printed fabrication and integration into vehicle windows or roofs.

Este trabajo analiza cómo la modificación del plano de masa en dispositivos inalámbricos compactos (70 mm × 65 mm) con la tecnología antenna boosters impacta el ancho de banda y la eficiencia total en la banda de 824 – 960 MHz. Se estudian distintas estrategias, incluyendo ranuras y modificaciones estructurales del plano de masa, demostrando que estas técnicas optimizan la distribución de corriente y mejoran la eficiencia. Para validar experimentalmente los resultados de simulación, se fabricaron prototipos, obteniendo mejoras de hasta 2,3 dB en eficiencia. Estos resultados permiten mejorar el rendimiento de antenas en dispositivos con planos de masa eléctricamente pequeños (L < λ/π) , sin necesidad de aumentar su tamaño físico.

The increasing prevalence of Internet of Things (IoT) devices necessitates the development of energy-efficient solutions to prolong battery life and reduce environmental impact. This study explores the potential of using Aloe Vera as a ground plane in IoT device design to enhance antenna performance while minimizing the carbon footprint. By employing Antenna Booster technology, which facilitates device miniaturization without sacrificing efficiency, the research evaluates the feasibility of incorporating an organic Aloe Vera ground plane without compromising performance. Both simulation and experimental results confirm that extending the ground plane with Aloe Vera increases antenna efficiency by 3 dB. These findings highlight the potential of natural materials, such as Aloe Vera, in promoting sustainable improvements in IoT device performance, paving the way for environmentally friendly wireless communication systems.

This paper explores the adaptation of Gutman lenses for array-based feeding systems to overcome the limitations of single-radiator feeding systems, including limited radiated power and restricted beam steering flexibility. The adaptation is achieved through two new methodologies, both based on the analysis of the electric field at the focal plane of the lens. This work presents a proof of concept for these methodologies, providing simulation results and performance evaluations to assess their effectiveness in improving directivity while also examining the impact of lens size on system performance and limitations. Adapting the lens for array-based feeding offers significant benefits for applications such as fixed point-to-point communication systems, where near-broadside scanning and increased radiated power are crucial for mitigating external factors like weather and interference.

Se presenta el diseño de una superficie inteligente reconfigurable (RIS) autosuficiente energéticamente que opera en la banda de 2.4 GHz. La RIS está compuesta por una matriz de 10x10 celdas unitarias (UCs), capaces de captar ondas con polarización dual. Cada celda consiste en un parche planar de dos puertos, conectados a un circuito rectificador y a un circuito desfasador, respectivamente. Las ondas electromagnéticas (EM) con polarización vertical (V-pol) se reflejan en la dirección deseada mediante el uso de un varactor de bajo consumo de potencia, que actúa como carga reactiva controlable permitiendo cambiar la fase de reflexión de cada UC. Por otro lado, la señal incidente con polarización horizontal (H-pol) se utiliza para excitar una red de rectificadores, cuya potencia de salida en DC alimenta los varactores implicados para la redirección. Para lograr una solución compacta, los circuitos asociados al varactor y a los rectificadores se ubican en la parte posterior de cada UC, conectados mediante vías pasantes. El diseño de las UCs, realizado mediante co-simulación no-lineal/EM, predice una pérdida media de 1 dB para una potencia entrante de -10 dBm, mientras que la potencia media de DC extraída en cada UC es de 25 uW, lo que satisface ampliamente los requisitos de potencia de los varactores con un consumo del orden de nW para las operaciones de sintonización. Finalmente, se presentan simulaciones EM de la metasuperficie propuesta de 10x10 UCs que demuestran sus capacidades de redireccionamiento para diferentes ángulos de salida.