Study of signal propagations at 2.45GHz for wireless BAN applications

WBAN signal propagations along human bodies were examined at 2.45GHz. By placing antennas on the human tissue equivalent phantom, the received signal strength was reduced by 10~15dB due to absorption. By deploying an electromagnetic (EM) shielding apron in close proximity of the antennas, the loss due to human body absorption could be compensated. Both the static measurement conducted in the laboratory environment and the in-situ measurement conducted with an individual in walking movement have suggested approaches to enhance WBAN signal propagations with the use of shielding materials. Utilizing shielding fabrics in WBANs for propagation enhancement has shown to be feasible, but an optimal deployment strategy needs to be developed.