The Path Loss of Human Arm for Wearable Application

In this paper, the human arm is selected as the research object to study its path loss for wearable application. Two same all-fabric microstrip antennas with microstrip line feed are designed using conventional fabric materials and conductive fabrics, where the less electromagnetic wave propagate along the arm than that of the dipole antenna etc. The measured S21 parameter of same curvature in free space and on the arm for both are compared and analyzed, and then get the path loss for the arm characteristics. Finally, the curve fitting technique is used to fit these two measured curves according to the fundamental of the path loss. The results show that the path loss index in free space at the resonance frequency of 5.8GHz is 2.23, while it is 1.03 on the arm.