Charcoal-Containing Microwave and Infrared Electromagnetic Shields with an Orderedly Structured Surface Layer Based on Foiled Material

The authors proposed the low-cost technologies for manufacturing electromagnetic shields. The paper contains the description of the proposed technologies. The shields manufactured according to the proposed technologies have three layers. The first (outer) layer consists on the set of orderedly structured 3D-elements. These elements have the shape of classical Archimedes spiral, loop or Mobius strip). These elements made from aluminum-containing foiled polymer material. The second (intermediate) layer is powdered activated charcoal particles impregnated by sodium chloride aqueous solution with a concentration of 35.0±1.0% and fixed between the fragments of self-adhesive polymer film. The third (inner) layer is aluminum aluminum-containing foiled polymer base. The paper also contains the description of the established regularities of changes of effective absorption bandwidth in the frequency range 2.0–17.0 GHz of the electromagnetic shields manufactured according to the proposed technologies depending to the shape of 3D-elements contained on their first (surface) layers. According to these regularities, the effective absorption bandwidth of the electromagnetic shields the first (inner) layers of which contains 3D-elements with the shape of classical Archimedes, loop or Mobius strip spiral achieves 8.0, 7.5 or 11.5 GHz respectively. Moreover, the paper also contains the description of the established regularities of changes of electromagnetic radiation reflection coefficient values in the infrared range such shields depending to the shape of the indicated elements. According to these regularities, the electromagnetic radiation reflection coefficient value in the infrared range of the electromagnetic shields the first (inner) layers of which contains 3D-elements with the shape of classical Archimedes, loop or Mobius strip spiral achieves 72.0, 86.0 and 78.0 % respectively. Electromagnetic shields manufactured according to the proposed technologies сan be used for the manufacture of the panels for the functional zoning of rooms where electronic devices are located that are sensitive to the effects of microwave or thermal noises.