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Electromagnetic Shielding Effectiveness of an Absorber-Like Carbonyl Iron-FeNi Double-Layer Composite

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Abstract

A genetic algorithm was employed as a novel method to determine the best combination of materials for a double-layer electromagnetic shielding composite with good electromagnetic wave absorption efficiency at high frequencies from numerous magnetic materials. A carbonyl iron soft magnetic composite and a flaky FeNi soft magnetic composite were used to form the double-layer composite. The reflection and transmission parameters of the double-layer composite were measured using a vector network analyzer. The electromagnetic shielding effectiveness (SE) of the double-layer composite was calculated and analyzed. The double-layer composite was composed of two shielding materials with different electromagnetic parameters and demonstrated an excellent electromagnetic SE greater than 20 dB above 4 GHz; the ratio of the absorption efficiency (SEA) to SE (SEA/SE) was greater than 0.95, which indicates that more than 95% of the electromagnetic waves at high frequencies were attenuated by the shielding material, rather than being scattered into the surrounding environment. The double-layer composite exhibits excellent performance toward high electromagnetic waves absorption during the EMI shielding process.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No.11574122) and Joint Fund of Equipment Pre-Research and Ministry of Education (No.6141A02033242).

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Authors and Affiliations

  1. Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou, People’s Republic of China

    Zhenyu Dou, Junming Zhang, Guowu Wang, Donglin He, Chang Liu & Tao Wang

  2. Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Zhenyu Dou, Junming Zhang, Guowu Wang, Donglin He, Chang Liu & Tao Wang

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  1. Zhenyu Dou
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  2. Junming Zhang
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  6. Tao Wang
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Correspondence to Tao Wang.

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Dou, Z., Zhang, J., Wang, G. et al. Electromagnetic Shielding Effectiveness of an Absorber-Like Carbonyl Iron-FeNi Double-Layer Composite. J. of Materi Eng and Perform 31, 643–650 (2022). https://doi.org/10.1007/s11665-021-06156-7

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  • DOI: https://doi.org/10.1007/s11665-021-06156-7

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