Designing a wireless power transfer harvester for on demand implantable drug delivery system

In this paper a new design wireless power transfer harvester for on demand implantable drug delivery system is proposed. The implant system optimizes drug delivery as demanded. RF to DC energy harvester simply consists of antenna and rectifier block for receiving electromagnetic radiation signal and to produce a DC voltage, respectively. For this reason, zero bias Schottky diodes are used. For increasing range of input voltage, a multiplayer circuit is used. Proposed circuit works at least with 40 mV. The advantage of proposed circuit is small dimension no need to transformer. Implemented circuit satisfied the limitation of design. Experimental results of the enhanced RF to DC converter measured a maximum output power of 200 mW at a distance of 4 Cm from a transmitter operating at 25 MHz. Thus, the harvested signal was enough to supply a low power wireless device application without battery maintenance.