Effect of subject size on electromagnetic radiation from source in human body following 2450MHz radio frequency exposure

For assessment of compliance with the safety guidelines, the radiation effects and efficiencies of ingested wireless devices in human body trunk models of five-year-old children, ten-year-old children and adults are studied using several homogenous models and a half-wavelength dipole at the frequency of 2450 MHz in this paper. The finite-difference time-domain (FDTD) method is used for analyzing the radiation effects and efficiencies. Results show that radiation efficiencies decrease with the increment of body size greatly, ranging from -53 dB to -116 dB. Considering the signal efficiency of wireless device and safety guidelines of radiation exposure, we recommend to set the ingested wireless device to different power levels for users with different body size such as five-year-old children, ten-year-old children and adults.