Thin Microwave Absorber Based on Laser-Induced Graphene Frequency Selective Surfaces

IF 2.3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE journal of radio frequency identification Pub Date : 2024-02-20 DOI:10.1109/JRFID.2024.3368005
Yann Houeix;Francisco J. Romero;Francisco G. Ruiz;Diego P. Morales;Noel Rodriguez;Darine Kaddour
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Abstract

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 $(\lambda _{\mathrm{ max}})$ , 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.
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基于激光诱导石墨烯频率选择性表面的薄型微波吸收器
本研究提出了一种利用激光诱导石墨烯(LIG)制造单层频率选择表面(FSS)的开创性方法。所提出的 FSS 结构由通过一步激光光热工艺直接在聚酰亚胺薄基底表面合成的 LIG 周期性电阻图案组成。对 LIG 的结构和电气特性进行了深入研究,以建立一个电气模型,优化设计和吸收特性。之后,我们制作了一个 12 毫米厚的 LIG-FSS 微波吸收器原型,并在实际条件下进行了测试,在 1.69 至 2.91 GHz 的频段内显示出超过 90% 的吸收率,而其厚度仅为最大波长 $(\lambda _\{mathrm{ max}})$ 的 0.068 倍,与模拟和理论结果非常吻合。此外,我们还讨论了通过相应调整诱导材料的特性来调整吸收器频率响应的可调性。最后,我们还展示了这种方法在基于替代模式制造 FSS 结构方面的多功能性。这项研究成果凸显了基于 LIG-FSS 结构的可持续微波吸收器的巨大潜力。
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