Numerical analysis of absorption mechanisms for mobile phones with integrated multiband antennas

Abstract

The absorption mechanism in the human tissue for mobile phones equipped with integrated antennas is analyzed by means of numerical simulations based on the FDTD (finite difference time domain) method. Single-band antennas for 900 MHz and 1800 MHz respectively are situated on realistic models of mobile phones which vary in length. The SAR (specific absorption rate) in a flat-phantom filled with tissue simulating material is observed when the mobiles are situated above. It is shown that there is a strong effect of the PCB (printed circuit board) of the mobile, which acts as the counterpart to the antenna module, on the SAR distribution in the phantom. The investigation shows that especially for 900 MHz the SAR generated by currents on the PCB is dominant in all configurations. Based on the above analysis an integrated multiband antenna for GSM/DCS/PCS is investigated with respect to the SAR distribution in a flat-phantom.