Microwave Composite Absorbers Based on Barium Hexaferrite/Carbon Nanotubes for 0.01-18 GHz Applications

Abstract

Nano- and microstructured composite materials have opened a new era for multifunctional materials. In particular, barium hexaferrites and carbon nanotubes can be applied in order to improve electromagnetic properties in composites. Magnetic materials with a texture based on barium ferrite and carbon nanotubes were obtained. The electromagnetic properties of Z – hexaferrites / carbon nanotubes composites were measured at microwave frequencies. It was shown, that imaginary permeability of barium hexaferrites/carbon nanotubes multilayer composites with double texture is as much as that of an isotropic samples at regions 3.4 – 8.5 GHz and 7.1 – 11.6 GHz.

Electromagnetic Properties of Carbon Nanotube/BaFe12−xGaxO19/Epoxy Composites with Random and Oriented Filler Distributions

“…Many articles discuss the achievement of higher performance in terms of the absorption properties of composites in the X and K u bands [21]. Li, Jun et al investigated co-substituted hexaferrites and their microwave absorption capacity at lower frequencies [22].…”

Effect of Temperature on the Magnetic Permeability of Hexagonal Ferrites

“…They have been an increasing degree of interest which is still growing exponentially today [2 -5]. The hexagonal ferrites are promising materials for the production of microwave absorbing composite materials [6,7]. When EM waves are irradiated into magnetic materials, a natural resonance (ferromagnetic resonance without an applied magnetic field) occurs, thus achieving the attenuation of EM waves.…”