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Electromagnetic and microwave absorption properties of carbonyl iron and CaCu3Ti4O12 composites in the X and Ku bands

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Abstract

Electronic devices and telecommunication systems operating in the gigahertz range have increased the problems related to electromagnetic interference. Radar absorber materials (RAM) are being developed to overcome this situation. Due to its dielectric properties, one option for this application is high dielectric constant materials, such as CaCu3Ti4O12 (CCTO). In this work, a mixture of CCTO and carbonyl iron powder (CI) was prepared and processed by solid-state reaction, with 200 °C and 300 °C sets for 2 h. The CCTO + CI mixtures were structural and morphologically characterized and used as fillers in a polymer matrix. Three composites were prepared using the mixed additive, and the samples were heated. Samples, with a thickness of 2 mm, were designed to study the electromagnetic properties of the material and absorption potential for microwaves in the frequency range of the X (8.2 to 12.4 GHz) and Ku (12.4 to 18 GHz) bands. These bands are used more extensively in defense, antennas, space, and others. In the X band, only the sample CCTO + CI 300 °C—2 h shows good absorption performance, and the effective bandwidth (less than − 10 dB) was 1.29 GHz. Finally, in Ku band, the reflection loss results for the samples CCTO + CI 200 °C—2 h and CCTO + CI 300 °C—2 h show a bandwidth 2.9 GHz and 4.9 GHz, respectively, with more than 90% reflection, and the maximum value for RL was − 15.6 dB at 13.81 GHz and − 25.33 dB at 15.24 GHz, respectively.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001 and by Financiadora de Estudos e Projetos – Brasil (FINEP).

Funding

Funding was provided by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Grant No. 001). Plinio Tenório, Financiadora de Estudos e Projetos.

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Authors and Affiliations

  1. Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil

    Plínio Ivo Gama Tenório, Ana Paula S. Oliveira, Aline Fontana Batista, Sergio Luiz Mineiro & Maurício Ribeiro Baldan

  2. Instituto Tecnológico de Aeronáutica, São José dos Campos, Brazil

    Newton Adriano S. Gomes

  3. Universidade de São Paulo, São Paulo, Brazil

    Maria Irene Bartolomeu Raposo

Authors
  1. Plínio Ivo Gama Tenório
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  2. Ana Paula S. Oliveira
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  4. Newton Adriano S. Gomes
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  7. Maurício Ribeiro Baldan
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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

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Correspondence to Plínio Ivo Gama Tenório.

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Tenório, P.I.G., Oliveira, A.P.S., Batista, A.F. et al. Electromagnetic and microwave absorption properties of carbonyl iron and CaCu3Ti4O12 composites in the X and Ku bands. J Mater Sci: Mater Electron 33, 24125–24136 (2022). https://doi.org/10.1007/s10854-022-09061-4

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