Study of Frequency Characteristic of Body Area Communication Channel

Body area communication could be a promising solution of next generation wearable communication networks for pervasive computing. Frequency characteristic of body area communication channel based on quasi-electrostatic field was studied in this paper. From the viewpoint of relaxation time of electrostatic equilibrium in human body inductive electrification, the relationship between induced charge density and strength of external electric field was derived. Transfer function of body channel was acquired and based on which the frequency characteristic was proved to be function of dielectric constant of human body and air, as well as conductivity of human body. Experiment was conducted in the frequency range from 100 kHz to 80 MHz, test results showed consistency with theoretical analysis that body channel shows low-pass property.