Modulation influence on power deposition inside a human head model exposed to 3.5 GHz plane wave

Abstract

Biological effects of radiofrequency fields remain one major subject of interest, with the continuous development of communication technologies and their more and more intensive use. Many authors have discussed the special role that modulation has on the produced effect, comparatively to continuous wave. Numerical dosimetric studies following the differences in power deposition in tissues, in function of the applied waveform, are scarce. Here, we analyse by numerical dosimetry, the specific absorption rate (SAR) of energy absorbed in a human head model when a plane wave, either a continuous one or two modulated ones (amplitude-modulated and quadrature amplitude modulated) are impinging the head, from frontal or lateral directions. The final objective was to emphasize the differences, based on average, peak values, or tissue-specific values of SAR. In all investigated cases the carrier frequency was 3.5 GHz, which belongs to the 5G mobile communications in the FR1 band. The computations were made in the case of the same total incident energy delivered per each modulation considered.