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Thin and Broadband Two-Layer Microwave Absorber in 4–12 GHz with Developed Flaky Cobalt Material

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Abstract

Microwave absorbing materials (MAMs) in the frequency range of 2.0–18.0 GHz are essential for the stealth and communication applications. Researchers came up with effective MAMs for the higher frequency regions, i.e., 8.0–18.0 GHz, while absorbers with comparable properties in the lower frequency band are still not in the limelight. Designing a MAM for the lower frequency range is a critical task. It is known that the factors governing the absorption in this frequency predominantly depend on the permeability and conductivity of the material, whereas the shape anisotropy of the particles can initiate different absorption mechanisms like multiple internal reflections, phase cancellations, surface charge polarization and enhanced conductivity that can promote the microwave absorption towards lower frequencies. But the material alone may not serve the purpose of getting broad absorption bandwidth. With the effective use of advanced electromagnetic technique like multi-layering this problem may be solved. Therefore, in this paper, a material with shape anisotropy (cobalt flakes with high shape anisotropy) has been prepared and a two-layer structure is developed which gives the absorption bandwidth in 4.17–12.05 GHz at a coating thickness of 2.66 mm.

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Acknowledgements

The authors are thankful to DST-SERB (Department of Science and Technology-Science and Engineering Research Board), Government of India, for the financial support. First author acknowledges All India Council of Technical Education, India for the financial assistance.

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Authors and Affiliations

  1. Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Neeraj Gill & Dharmendra Singh

  2. Department of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Neeraj Gill, Jaydeep Singh, Smitha Puthucheri & Dharmendra Singh

  3. Giani Zail Singh Campus College of Engineering and Technology, Bathinda, Punjab, 151001, India

    Neeraj Gill

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  1. Neeraj Gill
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Correspondence to Dharmendra Singh.

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Gill, N., Singh, J., Puthucheri, S. et al. Thin and Broadband Two-Layer Microwave Absorber in 4–12 GHz with Developed Flaky Cobalt Material. Electron. Mater. Lett. 14, 288–297 (2018). https://doi.org/10.1007/s13391-018-0025-2

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