Paper Title
Analysis of Specific Absorption Rate (SAR) on Human Head and Brain Under Exposure to Electromagnetic Radiation inIndoor and Outdoor Environment

Abstract
This study aims to analyze the radio-frequency electromagnetic fields (RF-EMF) exposure in indoor and outdoor scenarios on the human head. The electromagnetic radiation dueto access points (AP) operating at 2.45 GHz and 3.7 GHz is simulated to obtain SAR values on or inside a human head.This study is done to test howa high-frequencyantennacould affect EMF exposure to thehuman head under indoor and outdoor conditions. Here, access pointsare simulated as microstrip patch antennas operating at 2.4GHz and 3.7GHz using COMSOL Multiphysics simulation software. The indoor environment scenario involves SAR calculation in the presence of conducting surfaces or concrete walls. The SAR values are calculateddue to single,double, and triple antennasto replicate multiple radiation sources in the absence and presence of conductive surfaces or concrete walls to replicate an outdoor or indoor environment, respectively. These SAR values are used to distinguish the portions of the human head which are least and most exposed to electromagnetic radiation. It has been observed that as the frequency of the antennaincreases,the maximum value of SAR on the human head also increases. The presence of conductive surfaces and concrete walls also results in increased SAR values on the human head which in turn leads to a conclusion thatEMF exposure in an indoorenvironment is higher in comparison to outdoor. Keywords - Specific Absorption Rate, Electromagnetic radiation, Indoor exposure, 5G access point, Human models