Abstract
This paper is a comparative study of several antennas commonly used in cellular telephones. These include a monopole and a patch antenna. Each one of these structures is modeled and numerically tested using HFSS code. The testing procedure involves antenna simulation in the proximity of the human head. The behaviour of each antenna is evaluated for variable distances from the head geometry. Continuous waveform, representative of the sources used in mobile telephones, (250 mW) is used as the form of the antenna excitation. The SAR levels for the head tissues are calculated for and with accordance to the two currently accepted standards: Federal Communications Commission (FCC) and International Commission on Non-Ionizing Radiation Protection (ICNIRP). The computed SAR levels within each of the considered tissues vary for the two antennas under investigation.
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