Analysis of Coupling Effects between Human Head and Cellular Phone Antennas

This paper presents the synthesis and analysis of a helical antenna for cellular phone. Its coupling effect on human brain has also been investigated in detail. Antenna characteristics parameters such as reflection coefficient, directivity, gain, axial ratio has been observed in presence of SAM human brain phantom. First of all, antenna dimensions has been calculated using MATLAB Program. Further, CST Studio Suite has been used to model and simulate the mobile device in presence of a SAM human head phantom. The signal Absorption Ratio value for the modeled system, and its comparison with the limiting value given by different regulatory authorities present across the globe has been done. On simulating the model, reflection coefficient of the antenna is found to be -37.42 at the operating frequency of 900 MHz Directivity of the circularly polarized antenna is 3.69dBi and SAR value is 0.889 W/kg and 0.597 W/kg averaged for 1g and 10g of tissue respectively.