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Abstract
Research & Development in Material Science
Reflectivity Behavior in X-band of Microwave Absorbers based on Cu Substituted NiZn Spinel Nanocrystalline Ferrite
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Open or CloseSilva VA1,2,3*, Pereira JJ4, Nohara EL4 and Rezende MC1,5
1Instituto Tecnológico de Aeronáutica (ITA), São José dos Campos, Brazil
2Instituto de Pesquisa e Desenvolvimento/Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, Brazil
3Faculdade de Engenharia, Arquitetura e Urbanismo/UNIVAP, São José dos Campos, Brazil
4Departamento de Engenharia Mecânica, Universidade de Taubaté (UNITAU), Brazil
5Instituto de Ciência e Tecnologia/Universidade Federal de São Paulo (UNIFESP), São José dos Campos, Brazil
*Corresponding author: Silva VA, Instituto Tecnológico de Aeronáutica (ITA), São José dos Campos, Brazil
Submission: April 06, 2020;Published: April 23, 2020
ISSN : 2576-8840Volume13 Issue2
Abstract
Ferrites are widely used in radar absorbing materials (RAM) processing to adjust their electromagnetic properties aiming the attenuation of microwaves. In this work, RAM based on eight different formulations of NixCu0.5-xZn0.5Fe2O4 (0.2≤x≤0.5) nanocrystalline ferrites were prepared in epoxy resin (50wt.%). Reflectivity measurements in the frequency range of 8.2-12.4GHz (X-band), performed in waveguide, show the influence of both ferrite composition and the heat treatment temperatures on RAM performance. In a general way, the samples behave as broadband absorbers (-4 to -10dB) with the tendency of attenuation in lower frequencies (< 8.2GHz). A formulation with higher Cu molar fraction (x = 0.2) shows resonant behavior with the maximum attenuation of -30 dB (99.9% of absorption) at 8.4GHz.
Keywords: Radar absorbing materials, RAM; Reflectivity; CuNiZn Ferrite; Nanoparticles
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