Near-Field Inductive Wireless Power Transfer at ISM Bands for Biomedical Applications

The paper demonstrates a novel setup for near-field inductive wireless power transfer (WPT) working at two ISM (industrial, scientific and medical) bands (868-868.6 MHz and 902–928 MHz). The designed WPT setup consists of modified loop antennas at the transmitting and receiving front-end, a voltage doubler circuit acting as a power detector, and a homogeneous phantom mimicking the human body. The setup is capable of supplying maximum DC power of about 350 µW at the output for an input radio frequency (RF) power of 30 dBm. The DC output power can be used in driving implanted sensors for pacemaker and glucose monitoring systems.