EMC microwave absorber for outdoor applications

Abstract

In some circumstances, electromagnetic compatibility testing must be performed not in a specialized anechoic chamber, but in an open space. However, typical absorbers used in anechoic chambers to absorb incident radiation and to reduce the amount of rays reflected from the walls and the floor, such as ferrite tiles and graphite cones, are not suitable in an open space. In this work, we present the design and a test for the absorbing material, which can successfully be used in a tent or in a similar light and portable structure. The proposed composite material is flexible, has good absorbing and mechanical properties as well as low reflectivity. As an absorber, the nanocrystalline iron alloy with graphite, mixed with an elastomer was proposed. This material was additionally exposed to the ionizing radiation in the dose of 100 kGy in the radioactive gamma source (60Co). The permittivity, permeability, and the shielding properties of the material have been analyzed as well.

The use of gas chromatography for the determination of radiolytic molecular hydrogen, the detachment of which initiates secondary phenomena in the radiation modification of polymers

“…Several types of most different materials have been investigated for radiation yield of hydrogen, from inorganics like concrete [12,13] to organics [alanine], to commercial and laboratory polymers and biopolymers. Detailed data are published fully in publications dealing with particular systems and their radiation chemistry.…”

On metaheuristic aided structural topology optimization method for heat sink design with low electromagnetic interference

“…EMI remain an undesirable characteristic in electronic and electrical engineering due to its harmful effect on the accuracy of data transmission 2 , and the electromagnetic absorption dosage for humans 3 . To address this problem, various approaches have been suggested, such as absorbing material 4 , electric grounding 5 , and shielding 6 are utilized. However, in this research we are investigating the methodology of addressing the EMI elimination through the design phase.…”