Radar-Absorbing Composites Produced by Iranian Scientists
Today, the increasing spread of electromagnetic waves (specially at frequencies above one GHz, which are referred to as microwave waves) due to military, telecommunications, and electronic applications has led to a lot of research being conducted on the negative effects of these waves on the performance of electronic and telecommunications equipment. One way to prevent the negative effects of waves is to apply protective coatings. Absorbent composite coatings are a suitable alternative to other radar-evading materials due to their electrical properties, low density, high strength, and reasonable price.
These composites, considering the nature of electromagnetic waves, which propagate over time and distances like a flat wave and have electric and magnetic fields perpendicular to the direction of propagation, should have two main absorbing electric and magnetic components.
In these composites, a type of home-made epoxy with a reasonable price and sponge iron powder particles have been used as electrical and magnetic absorbers, respectively. What makes this product preferable compared to other similar products is the iron powder reinforcement with a sponge and porous morphology which has been produced for the first time in Iran by the solid-state reduction method.
Radar absorbing materials (RAMs) are dielectric or magnetic materials that has capacity for absorbing electromagnetic waves. In order to increase frequency range (bandwidth) of the absorbance, several structures have been already proposed by several researchers.
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