A Simplified Electromagnetic-thermal Analysis of Human Exposure to Radiation from Base Station Antennas

摘要

U ovom radu izložena je elektromagnetsko-toplinska analiza ljudskog tijela izloženog zračenju antena baznih stanica. Formulacija problema zasniva se na cilindričnom modelu ljudskog tijela. Elektromagnetski dio analize uključuje dozimetriju upadnog i unutarnjeg polja, dok se toplinskim modelom opisuje prijenos topline u tijelu. Električno polje inducirano u tijelu određuje se preko struje inducirane u tijelu. Raspodjela struje uzduž tijela dobivena je rješavanjem Pocklingtonove integralne jednadžbe za »debeli« cilindar. Pocklingtonova integralna jednadžba numerički je riješena primjenom Galerkin-Bubnove metode rubnih elemenata. Jednom kada je dobiveno unutarnje električno polje i ukupna snaga apsorbirana u tijelu, moguće je izračunati odgovarajući porast temperature u tijelu zbog izloženosti GSM zračenju. Ovaj porast temperature određuje se rješavanjem bio--toplinske jednadžbe primjenom metode konačnih elemenata.%Electromagnetic-thermal analysis of the human body exposed to base station antennas radiation is presented in this paper. The formulation of the problem is based on a simplified cylindrical representation of the human body. Electromagnetic part of the analysis involves incident and internal field dosimetry, while the thermal model deals with the bio-heat transfer processes in the body. The electric field induced in the body is determined through the corresponding axial current induced in the body. This current distribution along the body is obtained by solving the Pocklington integral equation for a thick cylinder. The Pocklington integral equation is solved numerically via the Galerkin-Bubnov Boundary Element Method (GB-BEM). Once the internal electric field and related total absorbed power in the human body is obtained, it is possible to calculate a corresponding temperature rise in the body due to the GSM exposure. This temperature rise is determined by solving the bio-heat transfer equation via the conventional finite element method (FEM).