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Computed SAR levels in vehicle occupants due to on-board transmissions at 900 MHz

Numerical simulations have been carried out to assess the specific absorption rate (SAR) in vehicle occupants due to onboard 900 MHz transmissions. The sources considered include a simple external roof-mounted antenna and internal transmitters that are not in contact with the body. The simulations employed homogeneous human simulants to obtain induced SAR values, and investigated a variety of occupancy configurations, ranging from only the driver to a driver and three passengers. Both local and whole-body average SAR levels are found to vary widely with the number and placement of occupants, as well as with antenna configuration. Nonetheless, the computed SAR levels are found to be well below recommended limits for general public exposure at typical radiated power levels.