XIX Sympozjum Srodowiskowe PTZE - materialy.pdf

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XIX Sympozjum PTZE, Worliny 2009 nych, a następnie pokazane będą rezultaty eliminacji tych niedostatków poprzez zastosowanie metod asymptotyki jednostajnej. Literatura 1. L.B. Felsen i N. Marcuvitz, Radiation and Scattering of Waves, Prentice-Hall, 1973. 2. N. Bleistein i R. Handelsman, Asymptotic Evaluation of Integrals, Holt,Rinehart and Winston, 1975. 46
XIX Sympozjum PTZE, Worliny 2009 A STUDY ON SAR IN SPHEROIDAL MODELS OF HUMAN BODY Katarzyna Ciosk Faculty of Electrical Engineering, Automatics and Computer Science, Kielce University of Technology The recent development of mobile communication and wireless networking of computer units has resulted in an increasing public concern about the biological effects of electromagnetic fields on the human body and about the possible impact of electromagnetic field on health. The commonly adopted measure for the absorbed energy in biological tissues is the specific absorption rate (SAR). Value of SAR depends on incident field parameters such the intensity, polarization [1] and frequency [2] and on parameters of the body. Protection from potential dangers is based on established safety guidelines, which propose maximum permissible values for the SAR, in order to exclude or minimize the possibility of overexposure. The level and distribution of radiofrequency energy absorbed in a child's body compared to those in an adult body has been a controversial issue in recent years. It has been suggested that SAR has higher value in children due to their smaller body size. This paper presents the computation of the whole-body averaged SAR distribution inside a prolate spheroidal model of human body exposed to far-field electromagnetic fields. The aim of the paper is to investigate how the body parameters, such as size and parameters can influence the energy absorption in biological matter. Apart from the effect of the body size, the effect of higher values of the child tissues electrical properties on whole body SAR in spheroidal biological model is examined. The focus of the present study is the effect of polarization of incident electromagnetic waves on the SAR in different models. This is because previous studies investigated the SAR for plane-wave exposure with H polarization [4]. The electric field strength distribution inside the body were obtained by semi-analytical method [3] and the whole-body specific absorption rate inside the spheroidal models ware calculated. Time-harmonic fields with the time-dependence e jωt as a uniform plane wave were suppressed. The external medium was assumed to be free space. The simulations were done for frequencies ranging from 900 MHz to 3000 MHz. The absorption has been investigated for 20 different dielectric prolate spheroidal human body models corresponding to dimensions of human body. The spheroidal body dimensions taken into account are corresponding to statistical data availabled on human height and weight of body. The electromagnetic parameters are fitted to these models. The spheroid is an isotropic lossy dielectric. The relative permittivity ε’-jε” and the conductivity of tissue depend on frequency. European Standard EN-50361 establishes values of ε, γ for fantom liquid at mobile frequency band 300 – 3000MHz to be used in SAR calculations. The conductivity and permeability of tissues of young organism are higher comparing to the adult organism. It is assumed that the decrease in the dielectric properties values with age may be due to changes in the water content and the 47
Page 1 and 2: Współorganizatorzy: CENTRALNY INS
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Page 6 and 7: 11:30 - 13:30 SESJA II ZASTOSOWANIA
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H_zob 2. TFM geometry optimization
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References XIX Sympozjum PTZE, Worl
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1000 100 10 H-Field 3D [nT] E-Field
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Rys. 1. Rozpatrywany model (rysunek
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The usual stimulation is done by ma
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Literatura XIX Sympozjum PTZE, Worl
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a) b) 45 40 35 30 25 20 15 10 5 5 1
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u1 i1 N1 u2 i2 N2 um i m Nm XIX Sym
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Introduction XIX Sympozjum PTZE, Wo
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Tmax(K) 24 20 16 12 8 4 0 0.0004 0.
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