Electric fields inside an ambulance due to cellular phone radiation

The FDTD method was used to calculate the electric fields emitted from cellular phones inside an ambulance. Measurements of the electric fields emitted from cellular phones inside the ambulance were also performed by using a Narda Model SRM-3000 high frequency selective radiation meter. From measurement and simulation results, it is found that electric field strengths emitted from cellular phones inside the ambulance may be over the recommended EMI immunity level of 3 V/m set by the IEC for medical devices. An interference threshold separation distance of 30 cm is proposed for evaluating the interaction between cellular phones and medical devices inside an ambulance.