Variation of computed in-vehicle SAR with number and location of occupants at commonly used communications frequencies

Simulations of occupant SAR in a car equipped with on-board transmitters have been carried out using homogeneous human simulants. Results are presented for three SAR measures in eight occupancy configurations at four communications frequencies (400 MHz, 900 MHz, 1.8 GHz and 2.4 GHz) for a number of source locations. At radiated power levels of 1 W CW the computed SAR is well below recommended limits, but varies with the number of occupants and their distribution. However, these variations become smaller at the higher frequencies.