A Study Of EMR And SAR Distribution In Human Head Phantom Exposed To RF Energy: A Simulation Approach
In this study, the radiated emission field and specific absorption rate (SAR) when a human head phantom was exposed to radio frequency (RF) field of a mobile phone model was carried out and conducted using the
FEKO emss software. The radio frequencies considered for this work were the 900MHz and the 1800MHz as used by the global system for mobile communication in Nigeria. The human head model and a mobile phone
model were developed with the aid of an Electromagnetic Simulation Software (emss) known as FEKO. The phone simulated was positioned in the calling mode such that the radiation mainly focuses on the head, and the simulated results as displayed on the FEKO emss GUI window were presented. The solution of the simulation in terms of the internal electric field and SAR distribution in the head were interpreted in both the x-direction and y-direction. The E-field taken in the x-direction (plane) of the simulated result measured the highest values around the core area of the head with a magnitude of about 12.5V/m and 10.5V/m at 900MHz and 1800MHz respectively. Around the ear, the SAR values were 0.33W/kg and 0.417W/kg at 900MHz and 1800MHz respectively. The magnitude of SAR of about 0.0317W/kg was measured around the core area of the head as
viewed in the x-direction within 6.48hours simulated time of RF exposure to the head phantom. However, the spatial-peak SAR values as averaged over 1 gram and 10g on the human head model obtained with a radiated
power of 0.32W for both simulations were well below the limit of 1.6 W/kg of ICNIRP standard and FCC/IEEE standard of 2W/kg.
Keywords: Electromagnetic radiation (EMR), Specific Absorption Rate (SAR), Electromagnetic simulation software (FEKO emss), Radio frequency field, human head, mobile phone, mobile phone antenna, spatial peak SAR.