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Thin and Broadband Two‑Layer Microwave Absorber in 4–12 GHz with Developed Flaky Cobalt Material
Neeraj Gill,Jaydeep Singh,Smitha Puthucheri,Dharmendra Singh 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.3
Microwave absorbing materials (MAMs) in the frequency range of 2.0–18.0 GHz are essential for the stealth and communicationapplications. 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 MAMfor the lower frequency range is a critical task. It is known that the factors governing the absorption in this frequency predominantlydepend on the permeability and conductivity of the material, whereas the shape anisotropy of the particles caninitiate different absorption mechanisms like multiple internal reflections, phase cancellations, surface charge polarizationand enhanced conductivity that can promote the microwave absorption towards lower frequencies. But the material alone maynot serve the purpose of getting broad absorption bandwidth. With the effective use of advanced electromagnetic techniquelike multi-layering this problem may be solved. Therefore, in this paper, a material with shape anisotropy (cobalt flakes withhigh shape anisotropy) has been prepared and a two-layer structure is developed which gives the absorption bandwidth in4.17–12.05 GHz at a coating thickness of 2.66 mm.
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