Case Study: Measurements of Radio Frequency Exposure from Wi-Fi Devices

Images

Figure 1 – Setup of Wi-Fi access point 1 (5180 MHz) near the ceiling

The Wi-Fi Access Point 1, operating at 5180 MHz, is mounted on the ceiling with the antenna pannel hanging next to it.

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Figure 2 – Setup of Wi-Fi access point 2 (2437 MHz) at 1.1 metres from the floor

The Wi-Fi Access Point 2, operating at 2437 MHz, is installed on top of a computer desktop tower at approximately 1.1 meters from the floor.

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Figure 3 – Aerial view of the measurement location in Aurora, Ontario

Arial view of the location in Aurora, Ontario where the measurements were performed.

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Figure 4 – Schematic of Wi-Fi measurement locations

The schematic provides the locations of the 24 laptops and the 2 Wi-Fi access points in the Aurora boardroom. The laptops are located on two rows of tables, with 12 laptops in each row of tables. The Wi-Fi access points are installed at both ends of the boardroom. Twelve measurement locations were pre-selected in the boardroom; 4 locations evenly spaced on one side of one row of tables, 4 locations evenly spaced between the two rows of tables and 4 locations evenly spaced on the other side of the second row of tables. The dimensions of the boardroom are 6.08 meters by 8.53 meters.

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Figure 5 – Boardroom setup

A view of the boardroom with the laptops, one of the Wi-Fi access points and the measurement equipment used for this study.

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Figure 6 – Tri-axis antenna location for the uploading and/or downloading scenarios

The tri-axis antenna located between 2 tables with the laptops installed on top of them used for the uploading and/or downloading scenarios.

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Figure A.1 – 2.4-GHz spectral emission

The figure represents the spectral emission and channel allocations of the 2.4 GHz Wi-Fi band. The channel bandwith of 22 MHz is identified in the figure.

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Figure A.2 – Spectral emission of Wi-Fi AP2

The graph represents the spectral emission of the Wi-Fi Acess Point 2 operating at a center frequency of 2437 MHz. The horizontal axis represents the frequency in GHz and the vertical axis represents the power level in dBm. The peak power is centered around 2437 MHz.

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Figure A.3 – Spectral emission of Wi-Fi AP1

The graph represents the spectral emission of the Wi-Fi Acess Point 1 operating at a center frequency of 5180 MHz. The X-axis represents the frequency in GHz and the Y-axis represents the power level in dBm. The peak power is centered around 5180 MHz.

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Figure E.1 – Signals in the RF ambient environment for the 50 MHz to 3 GHz frequency band

The graph represents the signals in the RF ambient environment in the 50 MHz to 3 GHz frequency band, which capture licence exempt devices, such as Wi-Fi access points in the 2.4 GHz band. In addition, cellular services in the 800 and 1900 MHz bands were prevalent and captured on the meter. The highest exposure level for individual services is approximately 0.00001% of the SC6 limits for the 1900 MHz band.

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Figure E.2 – Signals in the RF ambient environment for the 3 to 6 GHz frequency band

The graph represents the signals in the RF ambient environment in the 3 GHz to 6 GHz frequency band. The highest exposure level for individual services is approximately 0.00001% of the SC6 limits close to the 6000 MHz band.

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