Toward an ultra-wideband hybrid metamaterial based microwave absorber

A El Assal (1) , H. Breiss (1) , R. Benzerga (2) , A. Sharaiha (2) , A. Jrad (1) , A. Harmouch (1)

1 LU / ULB - الجامعة اللبنانية [بيروت] = Lebanese University [Beirut] = Université libanaise [Beyrouth]
2 IETR - Institut d'Électronique et des Technologies du numéRique

In this paper, we propose a novel design of an ultra-wideband hybrid microwave absorber operating in the frequency range between 2 GHz and 18 GHz. This proposed hybrid absorber is composed of two different layers that integrate a multiband metamaterial absorber and a lossy dielectric layer. The metamaterial absorber consists of a periodic pattern that is composed of an arrangement of different scales of coupled resonators and a metallic ground plane, and the dielectric layer is made of epoxy foam composite loaded with low weight percentage (0.075 wt.%) of 12 mm length carbon fibers. The numerical results show a largely expanded absorption bandwidth that ranges from 2.6 GHz to 18 GHz with incident angles between 0◦ and 45◦ and for both transverse electric and transverse magnetic waves. The measurements confirm that absorption of this hybrid based metamaterial absorber exceeds 90% within the above-mentioned frequency range and it may reach an absorption rate of 99% for certain frequency ranges. The proposed idea offers a further step in developing new electromagnetic absorbers, which will impact a broad range of applications. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Mots clés: Anechoic chamber; Dielectric layer; Hybrid absorber; Metamaterial; Ultra-wideband absorber

Domaines: Matériaux; Electromagnétisme

A El Assal, H. Breiss, R. Benzerga, A. Sharaiha, A. Jrad, et al.. Toward an ultra-wideband hybrid metamaterial based microwave absorber. Micromachines, 2020, 11 (10), pp.0930. ⟨10.3390/mi11100930⟩. ⟨hal-03002117⟩