Computation of SAR Variation with Oblique Angle of Incidence for Human Head Exposed to Mobile Phone Using Transparent Shield

Abstract

AbstractIn the proposed work, a mathematical analysis of specific absorption rate (SAR) deduction using transmission line method is performed in adult and child head by considering a planar four-layer head model at lower and mid 5G mobile frequencies. The change in the SAR with the oblique incidence of EM wave (0 to 90°) is observed utilizing the shielding effectiveness (SE) variable of transparent silver nanowire/poly (diallyldimethylammonium chloride) (PDDA) with nickel coating on top. The simulations were performed for SE with the angle of incidence, and results are tabulated for the same. It is found from the results that the child model has absorbed more radiation levels than an adult head model at 6 GHz without a shield, but with transparent AgNW/PDDA/Ni laminated shield, the SAR has reduced to 0.000779 mW/kg at 89° TE polarization in a four-layered child head model than in TM polarization. The SAR absorption by the brain layer of the head is less in the TE polarization in the adult than in the child head model. KeywordsFour-layer human head modelTransmission line methodSilver nanowire (AgNW)Transparent laminated shieldMobile smartphone exposureSpecific absorption rate (SAR)