Exploring Carbon Nanotubes/Batio3/Fe3o4 Nanocomposites as Microwave Absorbers

Abstract

Abstract-We report the modelling and characterization of microwave absorbing materials specially designed for 26-37 GHz frequency range (Ka-band).Composite materials based on carbon nanotubes/BaTiO 3 /Fe 3 O 4 in a phosphate ceramic matrix were produced, and their electromagnetic response was investigated. Both theoretical and experimental results demonstrate that this material can absorb up to 100% of the power of an incident plane wave at a normal incidence angle. The physics underlying such absorption level is discussed in terms of refractive index of the material.

Design of Carbon Nanotube-Based Broadband Radar Absorber for Ka-Band Frequency Range

“…In contrast to our recent work [7], here we consider radar absorbers design based on nonmagnetic materials. In this case, we will investigate the EM properties depending on complex dielectric permittivity components.…”

“…In the present paper, we use carbon nanotube-based composites to produce an effective broadband absorber for Ka-band region (26-37 GHz). In contrast to our recent work [7], here we consider electromagnetic properties of composites with concentration of inclusions above percolation threshold. So the materials under study are macroscopically conductive with a static conductivity of "several Siemens per meter" and have pronounced frequency dispersion of dielectric permittivity ε ∼ 1/ν, which is optimal for design of microwave absorbers [1].…”

“…The maximum considered in Fig. 1 is equivalent to the maximum considered in terms of complex refractive index in [7]. The position of the absorption maximum strongly depends on thickness and frequency, but the general view ( Fig.…”

“…The first-principle equations describing the electromagnetic response of such a system in free space are well known [15,16]. The amplitude of the reflected signal in the waveguide is defined as [7,17]:…”

“…For development of 5G communication systems, it is necessary to solve many problems related to electromagnetic compatibility and develop materials effectively absorbing electromagnetic radiation at high frequencies. Many researchers worldwide concentrate on the design of absorbers for various frequency ranges [1][2][3][4][5][6][7][8][9].…”