Thin microwave absorber based on Laser-Induced Graphene Frequency Selective Surfaces Houeix, Yann Romero Maldonado, Francisco Javier García Ruiz, Francisco Javier Morales Santos, Diego Pedro Rodríguez Santiago, Noel Kaddour, Darine Frequency Selective Surface Laser-induced graphene Microwave absorber Thin-film electronics This work was supported by the Grant PID2020-117344RB-I00 funded by MCIN/AEI/10.13039/501100011033, as well as by the FEDER/Junta de Andalucía-Consejería de Transformación Económica, Industria, Conocimiento y Universidades through the projects Projects P20_00265 and BRNM-680-UGR20. This work was also partially supported by Project TED2021-129949A-I00 funded by MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR. In addition, this work was supported by the Junta de Andalucía – Consejería de Transformación Económica, Industria, Conocimiento y Universidades through the project ProyExcel-00268, as well as by the Spanish Ministry of Sciences and Innovation through the predoctoral grant PRE2021-096886. This study presents a pioneering approach to fabricating single-layer Frequency Selective Surfaces (FSS) using Laser-Induced Graphene (LIG). The FSS structure proposed consists of periodic resistive patterns of LIG synthesized through a one-step laser photothermal process directly on the surface of a thin polyimide substrate. The structural and electrical properties of LIG were thoroughly investigated to develop an electrical model aiming at optimizing the design and absorbing properties. After that, a 12 mm thick LIG-FSS microwave absorber prototype was fabricated and tested under real conditions, demonstrating over 90% absorption in the frequency band from 1.69 to 2.91 GHz with a thickness of only 0.068 times the maximum wavelength (λmax), demonstrating good agreement with the simulations and theoretical results. Additionally, we discuss the tunability of the frequency response of the absorber by adjusting accordingly the induced material’s properties. Finally, we also demonstrate the versatility of this approach for the fabrication of FSS structures based on alternative patterns. The findings presented in this work highlight the promising potential of sustainable microwave absorbers based on LIG-FSS structures. 2024-02-21T10:28:51Z 2024-02-21T10:28:51Z 2024-02-21 journal article Published version: Houeix, Yann et al. Thin microwave absorber based on Laser-Induced Graphene Frequency Selective Surfaces. Journal of Radio Frequency Identification https://hdl.handle.net/10481/89422 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE