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Characterization and Evaluation of a Commercial WLAN System for Human Provocation Studies.

Zentai N, Fiocchi S, Parazzini M, Trunk A, Juhász P, Ravazzani P, Hernádi I, Thuróczy G - Biomed Res Int (2015)

Bottom Line: Finally, the specific absorption rate (SAR) generated by the CU was estimated computationally in the head of two human models.Results suggest that exposure to RF fields of WLAN systems strongly depends on the sets of the router configuration: the stability of the exposure was more constant and reliable when both antennas were active and vertically positioned, with best signal quality obtained with the R52n router board at channel 9, in UDP mode.The maximum levels of peak SAR were far away from the limits of international guidelines with peak levels found over the skin.

View Article: PubMed Central - PubMed

Affiliation: Department of Experimental Neurobiology, University of Pécs, 6 Ifjúság Útca, Pécs 7624, Hungary.

ABSTRACT
This work evaluates the complex exposure characteristics of Wireless Local Area Network (WLAN) technology and describes the design of a WLAN exposure system built using commercially available modular parts for the study of possible biological health effects due to WLAN exposure in a controlled environment. The system consisted of an access point and a client unit (CU) with router board cards types R52 and R52n with 18 dBm and 25 dBm peak power, respectively. Free space radiofrequency field (RF) measurements were performed with a field meter at a distance of 40 cm from the CU in order to evaluate the RF exposure at several signal configurations of the exposure system. Finally, the specific absorption rate (SAR) generated by the CU was estimated computationally in the head of two human models. Results suggest that exposure to RF fields of WLAN systems strongly depends on the sets of the router configuration: the stability of the exposure was more constant and reliable when both antennas were active and vertically positioned, with best signal quality obtained with the R52n router board at channel 9, in UDP mode. The maximum levels of peak SAR were far away from the limits of international guidelines with peak levels found over the skin.

No MeSH data available.


Related in: MedlinePlus

Dependence of measured electric field at d = 40 cm on the frequency (channel number) for R52 (solid line) and R52n (dashed line) router board cards under test with UDP mode and one active antenna in vertical position. Asterisks mark channels where performance breakdown occurs (meaning that the card was unable to send data at the full data rate). Error bars represent mean ± standard deviation.
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fig6: Dependence of measured electric field at d = 40 cm on the frequency (channel number) for R52 (solid line) and R52n (dashed line) router board cards under test with UDP mode and one active antenna in vertical position. Asterisks mark channels where performance breakdown occurs (meaning that the card was unable to send data at the full data rate). Error bars represent mean ± standard deviation.

Mentions: Figure 6 shows the behavior of the electric field strength as a function of the channel and the corresponding frequency, for both R52 and R52n router board cards. Notice that both the R52 and R52n router board cards were utilized only on b/g transfer modes, never on a-mode or n-mode. The measurements were originally performed with a default system setting with both antennas upright (standing) and one of the antennas active and transmitting in UDP mode. In this setting using channels 10 to 13 and at frequencies higher than 2.452 GHz the signal quality and strength declined at full data rate indicating the breakdown of the performance in sending packets. Therefore, we avoided these channels for designing data transmission protocols for the planned WLAN exposure system. On the contrary, channel 9 guaranteed the maximum level of E for both router board cards, and therefore, channel 9 was considered the most suitable to be used in studies on possible biological effects of Wi-Fi exposure.


Characterization and Evaluation of a Commercial WLAN System for Human Provocation Studies.

Zentai N, Fiocchi S, Parazzini M, Trunk A, Juhász P, Ravazzani P, Hernádi I, Thuróczy G - Biomed Res Int (2015)

Dependence of measured electric field at d = 40 cm on the frequency (channel number) for R52 (solid line) and R52n (dashed line) router board cards under test with UDP mode and one active antenna in vertical position. Asterisks mark channels where performance breakdown occurs (meaning that the card was unable to send data at the full data rate). Error bars represent mean ± standard deviation.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4477099&req=5

fig6: Dependence of measured electric field at d = 40 cm on the frequency (channel number) for R52 (solid line) and R52n (dashed line) router board cards under test with UDP mode and one active antenna in vertical position. Asterisks mark channels where performance breakdown occurs (meaning that the card was unable to send data at the full data rate). Error bars represent mean ± standard deviation.
Mentions: Figure 6 shows the behavior of the electric field strength as a function of the channel and the corresponding frequency, for both R52 and R52n router board cards. Notice that both the R52 and R52n router board cards were utilized only on b/g transfer modes, never on a-mode or n-mode. The measurements were originally performed with a default system setting with both antennas upright (standing) and one of the antennas active and transmitting in UDP mode. In this setting using channels 10 to 13 and at frequencies higher than 2.452 GHz the signal quality and strength declined at full data rate indicating the breakdown of the performance in sending packets. Therefore, we avoided these channels for designing data transmission protocols for the planned WLAN exposure system. On the contrary, channel 9 guaranteed the maximum level of E for both router board cards, and therefore, channel 9 was considered the most suitable to be used in studies on possible biological effects of Wi-Fi exposure.

Bottom Line: Finally, the specific absorption rate (SAR) generated by the CU was estimated computationally in the head of two human models.Results suggest that exposure to RF fields of WLAN systems strongly depends on the sets of the router configuration: the stability of the exposure was more constant and reliable when both antennas were active and vertically positioned, with best signal quality obtained with the R52n router board at channel 9, in UDP mode.The maximum levels of peak SAR were far away from the limits of international guidelines with peak levels found over the skin.

View Article: PubMed Central - PubMed

Affiliation: Department of Experimental Neurobiology, University of Pécs, 6 Ifjúság Útca, Pécs 7624, Hungary.

ABSTRACT
This work evaluates the complex exposure characteristics of Wireless Local Area Network (WLAN) technology and describes the design of a WLAN exposure system built using commercially available modular parts for the study of possible biological health effects due to WLAN exposure in a controlled environment. The system consisted of an access point and a client unit (CU) with router board cards types R52 and R52n with 18 dBm and 25 dBm peak power, respectively. Free space radiofrequency field (RF) measurements were performed with a field meter at a distance of 40 cm from the CU in order to evaluate the RF exposure at several signal configurations of the exposure system. Finally, the specific absorption rate (SAR) generated by the CU was estimated computationally in the head of two human models. Results suggest that exposure to RF fields of WLAN systems strongly depends on the sets of the router configuration: the stability of the exposure was more constant and reliable when both antennas were active and vertically positioned, with best signal quality obtained with the R52n router board at channel 9, in UDP mode. The maximum levels of peak SAR were far away from the limits of international guidelines with peak levels found over the skin.

No MeSH data available.


Related in: MedlinePlus