Step 4: Estimate the tissue Electric field intensity
Step 5: Compute the SAR
Permittivity:
Permeability:
Speed of electromagnetic wave:
Example
Considering a WiFi router, the brain SAR for growing male/female infant till 36 months (WiFi radio being (5cm away)
2.5 GHz band operating at frequencies 2400MHz and 2500MHz for lower and upper
frequencies respectively. Hence from this we have center frequency as fc = 2450 MHz.
At this frequency we have the tissues electromagnetic properties as given in SAR Tables below with
peak transmit power of 100mW for OFDM technology.
Table1.0: Male/Female Infant SAR Values for WiFi Sources at 5[cm].