A novel measurement procedure for the Specific Absorption Rate conformity assessment of WiFi devices

The specific absorption rate (SAR) conformity assessment of WiFi devices is herein investigated. In order to derive the time-average of the SAR, a common approach is to evaluate an ensemble average of the measured samples. This approach cannot be applied when measuring non-deterministic signals typically transmitted by WiFi devices. The signal transmitted between WiFi devices during data exchange is complex and unpredictable. An alternative procedure based on the peak detection measurement of the signal is proposed. The feasibility of the peak detection scheme is studied by analyzing the probe´s time-domain response and the salient features of the WiFi communication protocol.