The bachelor’s thesis researches radiation exposure to a human in close proximity
to a base station antenna. For research and simulation purposes, the Kathrein
Street Connect antenna was used. It is designed for installation in pedestrian
surfaces in urban centers. The antenna model was built in the Sim4Life software
package, where human exposure to electromagnetic fields was numerically
determined using the FDTD (Finite-Difference Time-Domain) method.
To determine and interpret radiation exposure to the human body, the Specific
Absorption Rate (SAR) was used. It represents the amount of absorbed energy
per kilogram of body mass.
The research question seeks to determine the electric (E) and magnetic (H)
field strengths in free space and the resulting SAR induced by the antenna. Separate
analyses were conducted for the whole-body SAR (SARwb) and the localized
SAR values (SAR1g/SAR10g).
In the research results, the values of E and H are compared with the basic
restrictions defined in the national Regulation on electromagnetic radiation in the
natural and living environment while the SAR values are compared with the basic
restrictions provided by ICNIRP guidelines. The obtained SAR values under the
assumed radiated power of the antenna are below the maximum permitted limits.
Therefore, it can be concluded that the integrated antennas are safe for human
exposure.
|
