Abstract
As 5G millimeter wave (mmWave) wireless device involves some new technologies, such as beamforming, the radiofrequency (RF) exposure compliance test for the 5G mmWave wireless device is significantly complicated. In order to shorten the compliance period for 5G mmWave terminals, the relevant regulatory authorities recommend a combination of numerical simulation and measurements to demonstrate compliance. To verify the feasibility of this method, the RF exposure test conducted in this paper was a reverse procedure according to IEEE (the Institute of Electrical and Electronics Engineers) standards. First, actual measurements under various conditions, including different beam configurations, different test distances, different input power levels, different duty cycle, and nonpeak directions, were performed, and the changing trend of PD over testing conditions was analyzed. Then one dual-polarized patch antenna array was selected for simulation analysis. The feasibility of the method proposed in IEEE standards was proved through the comparison of the results experiment and numerical analysis.
Highlights
The 3rd Generation Partnership Project (3gpp) protocol divides the 5G frequency spectrum into two FR (FrequencyRange)
The power density (PD) shown as follows is computed under the averaging area of 1 cm2 and 4 cm2
Most of the values obtained from this antenna array are above the basic restriction of 20 W/m2 as averaged over 4 cm2 according to ICNIRP
Summary
The 3rd Generation Partnership Project (3gpp) protocol divides the 5G frequency spectrum into two FR As mmWave technology can achieve a faster speed and lesser extent latency than 4G network, 5G wireless device has attracted massive attention in recent years. In the meantime, it has raised the public concern regarding the biological effects on the human body resulted from the exposure to such high-frequency electromagnetic field (EMF). Studies have shown that when the frequencies are at 10 GHz-100 GHz, about 90% of the energy will be absorbed by the skin’s epidermis or dermis [2] In such circumstance, it is difficult to build a meaningful volume for SAR. Whereas power density measurement is a time-consuming procedure; combining simulation and measurement has been proposed as an efficient method during a compliance test
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