Programa del congreso

In this contribution, the shaping of a dispersive chessboard metasurface on a real target is studied. For this purpose, a model of an Unmanned Aerial Vehicle is used to analyze the critical areas that generate a larger radar cross section, which are the flat areas. However, edges between these areas can be problematic, which is why they are part of this study. In this aspect, it is verified that their presence is not a problem in terms of radar cross section reduction. On the other hand, the fuselage of the target under study is curved, so it is also necessary to analyze curved shaped surfaces. In this line, the original flat metasurface has been adapted to different cylindrical curvatures, achieving for all cases similar results to those obtained with the flat design.

This communication presents a numerical assessment of materials with inclusions concerning radar observability. For this, the Rozanov limit, obtained for homogeneous metal-backed materials, is used as a reference. The results, obtained from numerical modeling of materials with inclusions treated as dispersive effective media, suggests high versatility in achieving tailored radar responses

The analysis of electromagnetic (EM) wave propagation in an inhomogeneous, magnetically confined plasma is essential for nuclear fusion, particularly for ion and electron heating. This paper presents EMWAVE, a finite element code that simulates EM wave propagation in an anisotropic plasma by solving the Helmholtz equation in the frequency domain. The solver supports linear and quadratic elements and efficiently models complex domains. Various dielectric media and tokamak-relevant configurations have been benchmarked, demonstrating the code’s reliability. EMWAVE incorporates the cold plasma permittivity tensor, showing excellent agreement with the well-established ERMES code and theoretical predictions for tokamak cutoffs. Developed as a standalone tool and integrated into the HPC framework Alya, it aims to support reactor-scale simulations via a digital twin approach. Future work includes implementing a hot plasma permittivity tensor to capture wave-particle interactions and extending the model to 3D reactor geometries.

This work presents a method for free-space electromagnetic characterization of thin films in the X and Ku frequency bands implemented inside a compact anechoic chamber (80MHz-18GHz). The setup consists of two horn antennas to study transmission and reflection of samples using two configurations. The configuration for reflection measurements has the sample placed on a conductive support to study reflection as a function of the angle of incidence. Alternatively, the transmission configuration has both antennas pointing at the sample, which is positioned between them in a linear arrangement. Moreover, the experimental setup has a laser system for antenna and sample alignment to ensure maximum precision. The design's versatility was accomplished by using 3D-printing personalized supports, anchors and other accessories. The system was optimized via electromagnetic finite element and ray-tracing simulations. Preliminary results show potential for future usage of the proposed setup when developing absorptive materials.

This study presents experimental evidence and model comparisons demonstrating the ability to tune microwave absorption in magnetodielectric composite systems. Measurements of complex permeability, permittivity, and reflection loss at microwave frequencies were conducted in an anechoic chamber. The research focuses on mono- and bi-layer composites composed of a dielectric matrix and magnetic fillers. Novel considerations based on random magnetic anisotropy behavior were employed to design enhanced magnetic fillers. The high sensitivity of absorption capacity to design parameters is highlighted, along with their non-linear dependence. Additionally, the importance of proper fabrication for optimal electromagnetic performance is discussed based on the collected data. These findings underscore the potential for tailored design strategies in developing advanced materials for microwave applications.