title: Near-field radiofrequency electromagnetic exposure assessment.
abstract: Personal wireless telecommunication devices, such as radiofrequency (RF) electromagnetic field (EMF) sources operated in vicinity of human body, have possible adverse health effects. Therefore, the correct EMF assessment is necessary in their near field. According to international near-field measurement criteria, the specific absorption rate (SAR) is used for absorbed energy distribution assessment in tissue simulating liquid phantoms. The aim of this investigation is to validate the relationship between the H-field of incident EMF and absorbed energy in phantoms. Three typical wireless telecommunication system frequencies are considered (900, 1800 and 2450 MHz). The EMF source at each frequency is an appropriate half-wave dipole antenna and the absorbing medium is a flat phantom filled with the suitable tissue simulating liquid. Two methods for SAR estimation have been used: standard procedure based on E-field measured in tissue simulating medium and a proposed evaluation by measuring the incident H-field. Compared SAR estimations were performed for various distances between sources and phantom. Also, these research data were compared with simulation results, obtained by using finite-difference time-domain method. The acquired data help to determine the source near-field space characterized by the smallest deviation between SAR estimation methods. So, this region near the RF source is suitable for correct RF energy absorption assessment using the magnetic component of the RF fields.
authors.affiliation: a Federal State Budgetary Scientific Institution, Research Institute of Occupational Health , Moscow , Russian Federation .
authors.forename: Nina
authors.initials: N
authors.lastname: Rubtsova
authors.affiliation: a Federal State Budgetary Scientific Institution, Research Institute of Occupational Health , Moscow , Russian Federation .
authors.forename: Sergey
authors.initials: S
authors.lastname: Perov
authors.affiliation: a Federal State Budgetary Scientific Institution, Research Institute of Occupational Health , Moscow , Russian Federation .
authors.forename: Olga
authors.initials: O
authors.lastname: Belaya
authors.affiliation: b Foundation for Research on Information Technologies in Society , Zurich , Switzerland , and.
authors.forename: Niels
authors.initials: N
authors.lastname: Kuster
authors.affiliation: c Department of Electrical and Computer Engineering , University of Maryland , MD , USA.
authors.forename: Quirino
authors.initials: Q
authors.lastname: Balzano
mesh_terms: D065638:Absorption, Radiation; D004574:Electromagnetic Fields / Q000009:adverse effects; D004781:Environmental Exposure / Q000032:analysis*; D006801:Humans; D011846:Radio Waves / Q000009:adverse effects
keywords: H-field measurement; near-field measurements; specific absorption rate