Structural design and broadband radar absorbing performance of multi-layer patch using carbon black

To improve the reliability of the design and maximize the radar absorbing performance of the absorbent, a design method for the gradient and multi-layer radar absorbing patch (RAP) using the carbon black (CB) as the absorbent was proposed in this paper. Results show that a new accurate gradient impe...

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Bibliographic Details
Published in:Advanced composites and hybrid materials 2022-12, Vol.5 (4), p.3137-3145
Main Authors: Wang, Wen, Liu, Dongqing, Cheng, Haifeng, Cao, Taishan, Li, Yuelin, Deng, Yingjun, Xie, Wei
Format: Article
Language:English
Subjects:
Ceramics
Chemistry and Materials Science
Composites
Glass
Materials Engineering
Materials Science
Natural Materials
Original Research
Polymer Sciences
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Summary:To improve the reliability of the design and maximize the radar absorbing performance of the absorbent, a design method for the gradient and multi-layer radar absorbing patch (RAP) using the carbon black (CB) as the absorbent was proposed in this paper. Results show that a new accurate gradient impedance design for the conventional CB absorbent using gradient design principle fully optimize the impedance matching and attenuation characteristics of RAP, thereby effectively broadening the radar absorbing bandwidth. When the RAPs with 5%, 15%, 25%, and 35% of CB were used as the 4th, 3rd, 2nd, and 1st layers of RAP, respectively, the corresponding average sheet resistance of each layer is 730 Ω/sq, 578 Ω/sq, 336 Ω/sq, and 209 Ω/sq; the thickness of each layer is 2 mm; and the total thickness is 8 mm; the bandwidth of RAP with the reflection loss below −10 dB and −8 dB is 4.65 GHz and 12.22 GHz, respectively, in the frequency band of 4–18 GHz. The broadband radar absorbing effect resulted from the synergistic effect of gradient impedance and thickness. Due to the improved matching of surface matching layer and wave impedance of free space, more electromagnetic (EM) waves entered the RAP, and the transmission path of EM waves was extended because of the polarization, multiple refraction, and reflection of interface, thus increasing the reflection loss and improving the radar absorbing performance. This design strategy has significant effect on increasing the bandwidth of thin-layer radar absorbing materials. Graphical abstract
ISSN:2522-0128
2522-0136
DOI:10.1007/s42114-021-00399-7