Modeling of human interaction with antennas using the finite difference time domain technique

Many wireless communication devices are used with their antennas in close proximity to the human head. This results in changes in the antenna characteristics that affect the communications performance and in the deposition of microwave energy in the user's head. The amount of power deposited in the human body is limited to a given maximum value, according to current USA (FCC) and other regulation. We show here the feasibility and effectiveness of the FDTD method for complete evaluation of the human interaction with the performance of antennas for hand-held devices. A dual-frequency antenna and single-band monopole antennas are evaluated. Additionally, an accurate algorithm for computations of the power deposited in 1 g of tissue is introduced.