Abstract
A ultra-wideband microwave absorber (UWMA) combining frequency-selective surfaces (FSS) and dielectric layers is proposed. FSS patterns are printed by inkjet on dielectric layers using a resistive magnetic ink made of suspended carbon nanotubes decorated with \({\text {Fe}}_3{\text {O}}_4\) nanoparticles. The UWMA exhibits a huge fractional bandwidth of 140%, corresponding to reflectivity lower than − 10 dB and absorption higher than 90%, observed from 7 GHz to 43 GHz, meaning a 36 GHz bandwidth, for a thickness of only 0.26 \(\lambda\). This performance is achieved through a proper selection of FSS surface resistance, tuned by the number of printed layers. Excellent agreement is observed between designed and measured low reflectivity and high absorption.
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Acknowledgements
The authors are grateful to the National Fund for Scientific Research (F.R.S.-FNRS, Belgium) for supporting this research. This work is also supported by the Walloon region, and by the “Communauté Française de Belgique”, through the project “Nano4waves” funded by its research program “Actions de Recherche Concertées”. Special thanks are also due to Mr. S. Depaifve and Profs. A. Delcorte and C. Bailly for fruitful discussions in the frame of the Nano4waves project.
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Jaiswar, R., Mederos-Henry, F., Dupont, V. et al. A ultra-wideband thin microwave absorber using inkjet-printed frequency-selective surfaces combining carbon nanotubes and magnetic nanoparticles. Appl. Phys. A 125, 473 (2019). https://doi.org/10.1007/s00339-019-2764-9
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DOI: https://doi.org/10.1007/s00339-019-2764-9