UWB Pulse Propagation into Layered Model of Human Body

Abstract

The biomedical applications of Ultra-Wide Band (UWB) radar system promise a very important means to remotely monitor physiological signal. Researchers have shown great interest in proposing analytical techniques to accurately predict the propagation of UWB pulse in tissues layers. This paper focuses the study of the propagation of a UWB pulse into a human body to characterize the absorption and reflection of UWB signal due to different layers. Several time behaviors for the reflected pulse were used and compared with the transmitted pulse to the feasibility of movement and heartbeat activity monitoring. Results from the simulation showed that if the UWB transmit antenna is placed far from the human body, the reflection from the interface between the air and the fat can be used to detect the movements of the activity. Therefore, we proposed designing an analytic model of tissue layers, considering some parameters. Furthermore, the frequency dependency of the different layers, tissues dielectric properties and the continuous motion of intra thoracic tissue layers were incorporated. The present work illustrates an application of UWB system for contactless detection and analysis of the human vital signal. This paper focuses on the design of a propagation UWB pulse into a layered model of the human body using the tool of modeling Agilent Advanced Design System.