Abstract
In recent years there has been increasing concern about the possible consequences on human health from exposure to RF fields produced by wireless telecommunication technologies. In this work the coupling between carbon foam and composite materials made of carbon nanotubes and epoxy-resin allows to build a material able to absorb the electromagnetic field thus reducing its intensity in the environment where the mitigation of electromagnetic field is required. The Frequency range considered is 2 GHz - 3 GHz which is the most common frequency band used in wireless network and microwave oven too. Two different kind of heterogeneous materials are designed, one is a layered radar absorbing material made exclusively of epoxy resin and carbon nanotube in different weight percentage, the others are porous carbon foam where the pores are supposed be filled with carbon nanotubes and epoxy-resin. Both type of materials show interesting absorption properties reaching peak of reflection coefficient between –15 dB and –45 dB for a normally incident plane wave.
Highlights
IntroductionDue to its porosity carbon foam is able to gradually absorb the electromagnetic wave [8,9], and an enhancement of such effect was here analyzed by simulating the pores of the foam as filled with carbon nanotubes dispersed in the epoxy-resin with a filler concentration of 1 wt%
International exposure guidelines have been developed to provide protection against established effects from RF fields by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) [1] and the Institute of Electrical and Electronic Engineers (IEEE, 2005) [2].Some people perceive risks from RF exposure as likely and even possibly severe
The paper is organized in the following way: Section 2 reports the description of manufacturing of nanostructured composite materials, the Section 3 reports the dielectric measurements of nanostructured composite materials, the Section 4 describes the simulation of the nanostructured layered material and of the related electromagnetic absorbing, the Section 5 reports the finite element method (FEM) analysis of the radar absorbing materials (RAM) made of carbon foam and multiwalled carbon nanotubes (MWCNT)
Summary
Due to its porosity carbon foam is able to gradually absorb the electromagnetic wave [8,9], and an enhancement of such effect was here analyzed by simulating the pores of the foam as filled with carbon nanotubes dispersed in the epoxy-resin with a filler concentration of 1 wt%. In particular this last effect was studied by finite element method (FEM) using the COMSOL Multiphysics commercial code [10] where the dielectric properties of filler have been previously measured for the six different nanostructured composite materials. The paper is organized in the following way: Section 2 reports the description of manufacturing of nanostructured composite materials, the Section 3 reports the dielectric measurements of nanostructured composite materials, the Section 4 describes the simulation of the nanostructured layered material and of the related electromagnetic absorbing, the Section 5 reports the FEM analysis of the RAM made of carbon foam and MWCNT
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