Numerical Calculation of Electric Fields in Housing Spaces due to Electromagnetic Radiation from Antennas for Mobile Communication

H.-P Geromiller,A Farschtschi

doi:10.14311/580

Abstract

The influence of electromagnetic radiation from mobile antennas on humans is under discussion in various group of scientists. This paper deals with the impact of electromagnetic radiation in housing spaces. The space is assumed to be bordered by 5 walls of ferroconcrete and a door-window combination on the 6th side, the latter to be electromagnetic transparent. The transparent side of the housing is exposed to an electromagnetic wave. As the source of radiation is considered to be far away from the housing, the radiation is regarded as a plane wave. Due to the high signal frequency and the ferroconcrete walls, 5 sides of the housing space are considered to be perfect conductors. The electric field inside the housing is calculated numerically by the method of finite differences for different angles of incidence of the radiated electromagnetic wave. The maximum value of the calculated electric field is outlined in a diagram.

Highlights

The aim of this paper is to calculate the electric fields caused by the impact of electromagnetic waves inside a housing space
Simulation is performed by setting the components of the electric field strength Einc( z) and Einc( y) on the source plane according to the electric field strength Einc of the incident electromagnetic wave on the window/door combination
Fixing the angle of incidence of the propagating electromagnetic wave, the maximum absolute value of the electric field strength Emax was detected within the housing space and within the chosen time points for steady state

Summary

Introduction

The aim of this paper is to calculate the electric fields caused by the impact of electromagnetic waves inside a housing space. Five boundaries are considered to be walls of ferroconcrete and good reflectors for high-frequency signals as used for mobile communication These walls are simulated with PECs. The 6th boundary is considered to be a window/door combination and electromagnetically transparent. The direction of propagation needs to be taken into account, so the electric field vector of the incident wave is simulated on the source plane by decomposition into components. Simulation is performed by setting the components of the electric field strength Einc( z) and Einc( y) on the source plane according to the electric field strength Einc of the incident electromagnetic wave on the window/door combination. Impedance matched simulation of the free space along the window/door combination (source plane) is assured by implementing PMLs. The PML structure numerically absorbs the energy of the electromagnetic wave traveling from the interior of the house spacing towards the environment

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Conclusion