An international team of researchers has developed a system that collects energy from radio waves to power wearable devices.
Current energy sources for wearable health monitoring devices have drawbacks: solar power is not universal, and triboelectric devices can only harvest energy when the body is in motion.
Therefore, the researchers developed a broadband dipole antenna system: it can wirelessly transmit data collected from health monitoring sensors.
The system consists of two stretchable metal antennas embedded in a metal-coated conductive graphene material. Next comes the rectifier circuit, which converts the energy of electromagnetic waves into electricity. It can be used to power wireless devices or to charge energy storage devices such as batteries and supercapacitors.
Energy can be obtained from radio or electromagnetic waves that are found in the environment. Compared to other sources, less energy is generated, but the system runs continuously.