The Development of Human Body Parts Model for Wireless Communication Device Testing

1.Introduction Recently, the wireless equipments such as game machines, audio equipments and cellular phones have come to overflow in surroundings. The performance of these equipments strongly depends on an electromagnetic environment at the set up location. However, a lot of portable wireless communication devices are not designed considering the influence that the human body part such as operator's hands gives to the performance of those equipments. For instance, the influence of operator's hand causes deterioration of radiation directivity, antenna transmission efficiency and frequency response etc. Because the reproducibility of the testing is low, it is insufficient to evaluate the influence of operator's hand on the performance of wireless communication equipments by the real human body. Therefore, the approximation human body that can be used to evaluate operation of radio equipment is needed. In this report, the development of the artificial approximative human body with the synthetic material that can be used to the realistic situation of the wireless equipments testing is described. Concretely, the influence that the component of human's hand (for instance, skin, muscle, and bone, etc.) caused wireless equipments performance was analyzed by the numerical analysis. To evaluate a realistic wireless device performance, the model of simple shape that approximated actual human hand (hereafter, it is called the hand phantom) is designed referring to the above-mentioned result. Finally, the comparison result of the wireless device performance evaluation by hand phantom and actual human is shown, and the utility of hand phantom is proven.