Abstract
This paper presents the influence of different sizes of carbonyl iron particles on the reflectivity measurements of Radar Absorbing Material (RAM). The electromagnetic characterization was performed with a vector network analyzer and a rectangular waveguide in the frequency range of 12.4 to 18GHz (Ku Band). The influence of different parameters such as thicknesses, particle sizes and concentration of carbonyl iron were evaluated. Reflectivity results showed the influence of these parameters on the performance of the RAM. The best reflectivity values (~ -18 dB) were obtained for samples with 60 wt% concentration and 5 mm thickness. We provide information about significantly reflection loss improvement by simply controlling carbonyl iron particulate size.
Highlights
Radar Absorbing Material (RAM) is a type of material designed to attenuate electromagnetic radiation on specific frequencies
Materials like ferrite, carbonyl iron (CI), carbonaceous materials and conductive polymers has advantages over lossless materials [2],[3]. Despite their high specific mass, composites made with ferrites or CI have advantages like thin thickness and broadband frequency absorption because of iron on their compositions [4]
According to equations (1) and (2), the Reflection Loss (RL) of a RAM have influence of sample thickness and may have a frequency dependence inherited from complex permittivity and permeability [13]
Summary
Radar Absorbing Material (RAM) is a type of material designed to attenuate electromagnetic radiation on specific frequencies. RAMs are composite materials made with polymer (matrix) and absorptive material (mean). Materials with dielectric and/or magnetic losses are commonly used as means In this matter, materials like ferrite, carbonyl iron (CI), carbonaceous materials and conductive polymers has advantages over lossless materials [2],[3]. Carbonyl iron has a relatively low electrical conductivity, a high Curie temperature, and a high saturation magnetization. These properties make CI a good candidate to be used as absorption mean, especially in the frequency range between 2 -18 GHz [5]. Full catalyst reaction of composite mixtures was about 30 minutes
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