Induced EM field in a layered eccentric spheres model of the head: plane-wave and localized source exposure

Author

Skaropoulos, Nikos C. ; Ioannidou, Melina P. ; Chrissoulidis, Dimitris P.

Author_Institution

Dept. of Electr. & Comput. Eng., Aristotelian Univ. of Thessaloniki, Greece

Volume

44

Issue

10

fYear

1996

fDate

10/1/1996 12:00:00 AM

Firstpage

1963

Lastpage

1973

Abstract

The induced electromagnetic (EM) field in a layered eccentric spheres structure is determined through a concise analytical formulation based on indirect mode-matching (IMM). The exact analytical solution is applied to a six-layer model of the head. This model allows for eccentricity between the inner and outer sets of concentric spherical layers which simulate brain and skull, respectively. Excitation is provided by a nearby localized source or by an incident plane wave. The numerical application provides information about the total absorbed power, the absorption in each layer, and the spatial distribution of the specific absorption rate (SAR) at frequencies used by cellular phones. The effects of excitation frequency, eccentricity, exposure configuration, and antenna-head separation are investigated

Keywords

biological effects of microwaves; brain models; cellular radio; electromagnetic induction; health hazards; antenna-head separation; cellular phones; concise analytical formulation; eccentricity; excitation frequency; exposure configuration; incident plane wave; indirect mode-matching; induced EM field; layered eccentric spheres head model; localized source exposure; nearby localized source; plane-wave source exposure; six-layer model; skull; spatial distribution; specific absorption rate; total absorbed power; Brain modeling; Dipole antennas; Electromagnetic modeling; Electromagnetic radiation; Geometry; Head; Humans; Radio frequency; Skull; Time domain analysis;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.539956

Filename

539956