Kellomäki, Tiiti; Heikkinen, Jouko; Kettunen, Lauri (Department of Electronics, Tampere University of Technology, P.O.Box 692, FI-33101 Tampere, FINLAND)
Whittow, William G. (Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leics, UK, LE11 3TU)
Commercial plaster material (polyacrylate) is used as an antenna substrate. Two 2.45 GHz patch antennas are introduced, both designed to be attached directly to the skin. Measured efficiencies are 70 % in free space and 60 % on-body. Measured on-body gains of each antenna are 6.2 and 1.4 dBi. Simulated 1 g specific absorption rates (SAR) of the two antennas are 2.3 W/kg and 1.6 W/kg using 1 W input power. 10 g SAR values are 0.6 W/kg and 1.2 W/kg. Antenna feeding using snap-on buttons is investigated and has been found useful.