Interaction of microwave energy (900MHz -- 2.2GHz) with human brain tissue

Bonam, Lalithkalyan
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In recent years, bio-science concerns on the public health risk from microwave energy emitted from various sources. Despite much research efforts over few decades on the interaction of microwave energy with bio-tissues are still unclear. Some research results show that there is an elevated risk of causing the cancer in bio-tissues while other studies lead to the curing of cancer tissues with microwave energy, but either of these studies leads to inconclusive results. In this study an effective computational model has been developed to represent the interaction of microwave electromagnetic field with human brain tissue. In order to simulate the Specific Absorption Rate (SAR) a finite-difference time-domain (FDTD) numeric technique was used. The results show that the Specific Absorption Rate (SAR) is a function of the input power and it varies with distance. In this study a realistic human brain tissue and IEEE brain phantom models have been analyzed. It has found that at 900MHz to 2.4GHz frequencies range, the SAR increases above safety standard ( > 0.5 W/Kg) which can cause tissue damage. The distance between the mobile phone antenna and brain is found to be inversely proportional to specific absorption rate.

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Electrical and Computer Engineering