Characterizing the time variations of signals emitted by mobile terminals provides complementary information to health authorities, especially with the increase of frequency and energy of radiation towards millimeter waves. This experimental work aimed to quantify and classify the time variability of the electric field level measured at 10cm from a mobile phone connected sequentially to a 4th and 5th generation mobile network. Statistic analysis was performed on data from real-time spectrum analyzers, while self-similarity was computed by first recurrence plots of the radiated emissions, corresponding to five different types of mobile applications. Moreover, specificities to the communication standard and the type of application were identified.
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<p>Realistic human exposures to radiation emitted by a mobile terminal connected to either a 5G network (sub-6 GHz) or to a 4G network have been scarcely assessed till now. Present experimental work aimed at comparing the radiated field in air, in a single point situated at 10 cm from a mobile phone when running a set of 5 mobile applications in the two communication standards. The time-evolution of the electric field strength in air near the terminal during 25 s of use was recorded by an original method, together with the data rate of transmission. The emitted power density dynamics, its statistics, its slope of accumulation after the usage period and its average value per transmitted bit are analyzed and compared between all the situations. The peculiarities are emphasized and they are proved to depend on the communication standard and on the mobile application.</p>
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