A ultra-wideband thin microwave absorber using inkjet-printed Frequency Selective Surfaces combining carbon nanotubes and magnetic nanoparticles

Jaiswar, Rajkumar Rampati;Mederos Henry, Francisco;Dupont, V.;Hermans, Sophie;Huynen, Isabelle;et.al.
(2019) Applied Physics A: Solids and Surfaces — Vol. 125, n° 473 (2019)

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(en) 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 F e 3 O 4 nanoparticles. The UWMA exhibits a huge fractional bandwidth of 140%, corresponding to reflec-tivity 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 λ. 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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Jaiswar, R. R., Mederos Henry, F., Dupont, V., Hermans, S., Raskin, J.-P., & Huynen, I. (2019). A ultra-wideband thin microwave absorber using inkjet-printed Frequency Selective Surfaces combining carbon nanotubes and magnetic nanoparticles. Applied Physics A: Solids and Surfaces, 125(473). https://doi.org/10.1007/s00339-019-2764-9 (Original work published 2019)