Induced EM field in a layered eccentric spheres model of the head: Plane-wave and localized source exposure
- Aristotle Univ. of Thessaloniki (Greece)
Understanding the interaction of EM radiation with humans is essential in a number of contemporary applications. Special attention is paid to the absorption of EM energy by the human head, which exhibits a resonant behavior in the frequency band 0.1--3 GHz. The use of handheld transceivers for wireless communications, which operate in close proximity to the head, has raised safety-related questions and questions concerning the effect of the head on the performance of the mobile phone antenna. 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.
- OSTI ID:
- 398152
- Journal Information:
- IEEE Transactions on Microwave Theory and Techniques, Vol. 44, Issue 10Pt2; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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