Abstract
This paper presents a comparative study involving experimental and numerical behaviors of radar absorbing materials (RAM), based on conducting composites of poly(o-methoxyaniline) (POMA) and carbon black (CB). Samples of POMA/CB in epoxy resin matrix were prepared. First, these samples were experimentally characterized by electric permittivity and magnetic permeability measurements in the frequency range of 8.2 to 12.4 GHz. Afterwards, a linear extrapolation of these electromagnetic parameters until 20 GHz was carried out. These amounts were used as parameters for a set of simulations, developed from numerical implementation of theoretical predictions. The main advantage of the performed simulations is to know the behavior of the POMA/CB/epoxy resin as RAM in a wide range of frequencies (8.2-20 GHz), previously to the experimental work. The validation of the simulations with experimental refl ection loss measurements showed a good fit and allowed predicting the material behavior as RAM. The results show that the studied RAM presents good return loss values in different frequencies, for example, –32 dB (~99.95% of absorption) at 14.6 GHz and –18 dB at 19.2 GHz, for samples with 7 and 9 mm-thickness values, respectively. The simulation tool used in this study was adequate to optimize the RAM production, contributing to the reduction of development costs and processing time of this kind of material.
Highlights
Associated with the increasing use of electromagnetic waves in the GHz range in equipment and devices used in telecommunication, military and medical areas, there is a need to monitor the effects of electromagnetic interference produced by the radiation generated (Feng et al 2007; Folgueras et al 2010)
This study aims to present results of numerical predictions of the microwave attenuation performance of a composite based on POMA/carbon black in epoxy resin, in the frequency range of 8.2 to 20 GHz, correlating the behaviors numerically calculated with those experimentally determined
We used an algorithm to simulate the behavior of microwave absorber based on POMA/carbon black in large frequency range (8.2–20 GHz) and with different thicknesses
Summary
Associated with the increasing use of electromagnetic waves in the GHz range in equipment and devices used in telecommunication, military and medical areas, there is a need to monitor the effects of electromagnetic interference produced by the radiation generated (Feng et al 2007; Folgueras et al 2010). RAM are so named because they have properties that allow them to exchange the energy of the incident electromagnetic radiation by thermal energy (Dias et al 2012; Wang et al 2017) For this phenomenon of energy exchange to take place, is required to set the proper values of impedances of such materials, in order to favor the propagation of the incident wave inside thereof, and not its reflection. Knowing that satisfies this condition promotes partial or almost total electromagnetic wave attenuation by physical and/or physico-chemical mechanisms (Feng et al 2007). In pursuit of this condition, the impedance values of the absorbing materials, mainly at the interfaces, should be adjusted to approach the maximum
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