Dual-band resonance induced broadband low-frequency radar absorber based on electric ring resonator embedded magnetic absorbing materials

Dongmeng Li, Yinrui Li, Xian Wang, Jiaji Yang, Fu Chen, Hui Luo, Yan Nie and Rongzhou Gong

Journal of Electromagnetic Waves and Applications, 2021, vol. 35, issue 6, 801-812

Abstract: Magnetic absorbing material (MAM) embedded with electric ring resonator (ERR) is demonstrated to broaden the absorbing bandwidth in low-frequency range. We obtained the relation between input impedance and absorption bandwidth under specific reflection threshold to verify the influence of the embedded ERRs on impedance matching characteristic. Numerical simulations were carried out and the results are in agreement with theoretical analysis. We investigated the absorption mechanism through analyzing the distributions of electric and magnetic fields. The incidence angle sensitivity under different polarization modes is also discussed. It is demonstrated that the MAM with embedded-ERR increased the bandwidth under −10 dB from 1.73–3.17 to 1.48–3.87 GHz and 1.47–4.07 GHz for the TE-incidence and TM-incidence, which is 1.66 and 1.81 times wider than that of MAM, respectively. The proposed structure could broaden the absorption bandwidth in low-frequency range by means of introducing dual-band resonance in a single-layer medium.

Date: 2021
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DOI: 10.1080/09205071.2020.1861553

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