Synthesis and microwave absorbing characteristics of functionally graded carbonyl iron/polyurethane composites | Zendy

R. B. Yang | Zendy; W. F. Liang | Zendy; Chenguang Wu | Zendy; C. C. Chen | Zendy

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Synthesis and microwave absorbing characteristics of functionally graded carbonyl iron/polyurethane composites

Author(s) -

R. B. Yang,

W. F. Liang,

Chenguang Wu,

C. C. Chen

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4943239

Subject(s) - materials science , reflection loss , composite material , microwave , carbonyl iron , stacking , polyurethane , impedance matching , emi , bandwidth (computing) , electromagnetic interference , attenuation , composite number , electrical impedance , optics , electronic engineering , telecommunications , physics , nuclear magnetic resonance , computer science , electrical engineering , engineering

Radar absorbing materials (RAMs) also known as microwave absorbers, which can absorb and dissipate incident electromagnetic wave, are widely used in the fields of radar-cross section reduction, electromagnetic interference (EMI) reduction and human health protection. In this study, the synthesis of functionally graded material (FGM) (CI/Polyurethane composites), which is fabricated with semi-sequentially varied composition along the thickness, is implemented with a genetic algorithm (GA) to optimize the microwave absorption efficiency and bandwidth of FGM. For impedance matching and broad-band design, the original 8-layered FGM was obtained by the GA method to calculate the thickness of each layer for a sequential stacking of FGM from 20, 30, 40, 50, 60, 65, 70 and 75 wt% of CI fillers. The reflection loss of the original 8-layered FGM below –10 dB can be obtained in the frequency range of 5.12∼18 GHz with a total thickness of 9.66 mm. Further optimization reduces the number of the layers and the stacking sequence of the optimized 4-layered FGM is 20, 30, 65, 75 wt% with thickness of 0.8, 1.6, 0.6 and 1.0 mm, respectively. The synthesis and measurement of the optimized 4-layered FGM with a thickness of 4 mm reveal a minimum reflection loss of –25.2 dB at 6.64 GHz and its bandwidth below – 10 dB is larger than 12.8 GHz

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