Effect of Penetration Depth and Thickness on the Performance of Nanocomposite Shield Made in the Frequency Band 8-12.5 GHz

Document Type : Original Research

Authors

1 Health Research Center, Life Style Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran

2 Department of Occupational Health and Safety, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran

3 Research Center for Health Sciences and Technologies, School of Health, Semnan University of Medical Sciences, Semnan, Iran

Abstract

Background and Aim: Due to the adverse effects of exposure to electromagnetic waves on humans and equipment, engineering controls such as the use of shields are one of the best ways to control and reduce exposure to electromagnetic waves. There are various methods to evaluate the performance of electromagnetic shields. The aim of this study was to investigate the effect of shield penetration depth and thickness on the performance of nanocomposites.
Methods: In this study, paraffin wax was used as a matrix and black carbon spherical nanoparticles and Fe3O4 were used as filler. Two nanocomposite samples were made with different weight percentages of fillers. The electromagnetic properties of nanocomposites made were measured using a Vector Network Analyzer in the frequency range of 8-12.5 GHz (X) based on the transfer/reflection method. The Delta function was used to evaluate the shielding protective performance at different thicknesses and frequencies.
Results: Based on the weight percentage of nanocomposite constituents, two samples were obtained. The highest penetration depth was observed in FN2 samples. Correlation between free space impedance and shield components was observed at the lowest shield thickness and at the initial frequencies. The lowest delta value was observed in the FN2 sample.
Conclusion: According to the Delta function, by increasing the absorption and decreasing the reflection in the shield, the protective efficiency of the shield increases. Shield thickness and frequency of electromagnetic waves affect the protective performance of the shield. Increasing the match of impedance between free space and shielding material increases the shield efficiency.

Keywords

References

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Journal of Military Medicine
Volume 23, Issue 5 - Serial Number 102
July and August 2021
Pages 435-443

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