On the Ultra Wideband Propagation Channel Characterizations of the Biomedical Implants

Ultra wideband (UWB) channel modeling from implanted antenna deep inside of a human body to receiving antennas on-body and outside body is considered for biomedical applications. Distance dependence of the channel path loss is modeled by simulating an implantable UWB antenna deep inside the chest of a human body. Time domain electromagnetic (EM) simulation using the anatomy model of a human body assuming frequency dependent tissue properties is conducted. It is shown that the energy coupling due to the non-radiative near-field of the implanted antenna becomes dominant for the signal transmission, where the link quality can be improved significantly by exploiting the near-field coupling. The effect of the implanted antenna polarization for UWB signal transmission is studied and shown that better link quality is obtained by utilizing the antenna polarization along the width of the body. Furthermore, we show that the distance dependent path loss for inside body can be modeled by a power function but it can only be modeled with a known logarithmic function for outside body.