A flexible microwave absorber based on nickel ferrite nanocomposite

作者：Sunny Vijutha; Kurian Philip; Mohanan P; Joy P A; Anantharaman M R^*

来源：Journal of Alloys and Compounds, 2010, 489(1): 297-303.

DOI：10.1016/j.jallcom.2009.09.077

• Nickel ferrite
• Nanocomposites
• Cavity perturbation
• Complex permittivity
• Complex permeability
• Microwave absorber

Flexible magnetic composite materials were prepared by incorporating precharacterized nickel ferrite nanoparticles in a natural rubber matrix. The complex dielectric permittivity and magnetic permeability of the composites were measured at different microwave frequencies using the cavity perturbation technique. A steady increase in dielectric permittivity was observed with increase in filler concentration. Maxwell-Garnett mixture equations were employed to model the effective permittivity and permeability of the composite. Reflection loss was estimated by employing the model of single layer absorber backed with a perfect conductor. Reflection loss minima of -5.9 dB at 3.2 GHz for 12 mm thick rubber ferrite composite sheet is obtained in the S-band while a loss up to -16 dB could be achieved at 9.5 GHz in the X-band.

• 出版日期2010-1-7