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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

Schematic diagram of the experimental setup for free-field measurement of the WLAN system.
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fig3: Schematic diagram of the experimental setup for free-field measurement of the WLAN system.

Mentions: For the free-field measurements both the server (i.e., AP) and CU were placed in an anechoic chamber and the RF field near the client was measured with a Narda PMM 8053 field meter (Narda Safety Test Solutions, Savona, Italy) with a wide-band E-field probe. The distance between the CU antennas and the field meter probe was 40 cm, which is aimed at modelling the typical distance between the user and the personal computer (e.g., notebook) in which Wi-Fi antennas are often mounted in the frame of the screen. Figure 3 shows an overview of the free-field measurement setup. The two PC that controlled the AP and CU units via Ethernet cables and were used for data acquisition from the field meter were placed outside the anechoic chamber in order not to perturb the electric field inside the chamber. To measure the directional characteristics the CU was fixed on the top of a programmable rotating platform with a rotational axis placed in the middle between the two antennas, while the field meter remained stationary (Figure 3).


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)

Schematic diagram of the experimental setup for free-field measurement of the WLAN system.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig3: Schematic diagram of the experimental setup for free-field measurement of the WLAN system.
Mentions: For the free-field measurements both the server (i.e., AP) and CU were placed in an anechoic chamber and the RF field near the client was measured with a Narda PMM 8053 field meter (Narda Safety Test Solutions, Savona, Italy) with a wide-band E-field probe. The distance between the CU antennas and the field meter probe was 40 cm, which is aimed at modelling the typical distance between the user and the personal computer (e.g., notebook) in which Wi-Fi antennas are often mounted in the frame of the screen. Figure 3 shows an overview of the free-field measurement setup. The two PC that controlled the AP and CU units via Ethernet cables and were used for data acquisition from the field meter were placed outside the anechoic chamber in order not to perturb the electric field inside the chamber. To measure the directional characteristics the CU was fixed on the top of a programmable rotating platform with a rotational axis placed in the middle between the two antennas, while the field meter remained stationary (Figure 3).

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