Interaction between human body and personal radiofrequency dosimeter: Effects of the metal plate presence

The personal radiofrequency dosimeters are increasingly used for the workers exposure estimation to the electromagnetic radiations in terms of reference level of the fields. The presence of the human body at the vicinity of dosimeter compromising its measurement accuracy. In this paper, the study of interaction between personal radiofrequency dosimeter and human body is presented. Firstly, we treat the error introduced by the presence of the body and an approach to reducing this impact by adding elements in the dosimeter structure. Indeed, by introducing a metal ground plane and optimizing the height of antenna-ground plane, we can estimate at 10% close the level of incidental field, that is to say a considerable reduction impact of the body on the dosimeter. We also study the stability of the intrinsic characteristics of dosimeter (isotropy and front to back ratio). Different simulations were performed in the GSM 900 band with the finite integration technique. In the context of the design of worn-body radiofrequency dosimeter it´s very useful to master these interaction results.