engleski

Human exposure and wireless communication aspects of electromagnetic wave absorption in dissipative objects inside reverberant environments

This study of electromagnetic wave absorption and human exposure to electromagnetic fields in closed reverberating environments was motivated by the perceived lack of methods and standards for assessment of human exposure to radiofrequency electromagnetic fields inside reverberant and semi-reverberant environments. Detailed analysis of available literature showed that human exposure assessment is almost exclusively performed assuming uniform or partial plane-wave exposure in free-space, although this is often not a realistic case. Humans in indoor reverberant environments are commonly exposed to the reflections coming from all directions. Therefore, the model that enables the analysis of the impact of complex indoor reverberant environments on human exposure was developed within this study. The model enables the calculation of the Specific Absorption Rate (SAR) using the Q factor of the room. Proposed model is based on the power balance theory applied to the realistic indoor reverberant environments that can basically be considered as cavity resonators. The advantage of exposure assessment using theory of resonators, compared to the conventional methods for determining SAR, lies in its simplicity due to the fact that measurement of the electromagnetic field is not necessary. The given model is based on thorough characterization of a reverberant environment in terms of its Q factor as an important parameter and electromagnetic behavior indicator. Additionally, application of the proposed model was suggested and demonstrated for the study of the absorption influence on a communication channel containing lossy dielectric objects.

human exposure assessment; radiofrequency (RF) electromagnetic field (EMF) dosimetry; reverberant and semi-reverberant environments; reverberation chamber; microwave resonator; cavity resonator; Q factor; lossy dielectric object; absorption cross section (ACS); specific absorption rate (SAR); wireless communication channel; power delay profile; RMS delay spread; coherence bandwidth

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