Continuously Power Delivering for Passive Backscatter Wireless Sensor Networks

Nowadays wireless sensor networks (WSNs) depend on the battery duration and there is a lot of interest in creating a passive sensor network scheme in the area of Internet of Things (IoT) and space-oriented WSN systems. Radio frequency (RF) energy harvesting enables the control and the delivery of wireless power to RF devices. All the devices made with this technology can be sealed, embedded with these structures, or made mobile, so they can be battery-independent. In this paper, we show that it is possible to have a complete passive WSN that could potentiate the IoT area and space craft sensing. This WSN should be capable of receiving a continuous flow of energy, so that the sensing mechanisms can be continuously powered. For this, we propose a combination of backscatter modulation with wireless power transfer, using the same diode based approach as in a traditional RF identification circuit. This way the cost is maintained low, but the amount of gathered energy is maximized during the backscatter communication. This paper also presents all the steps that are needed in order to implement such a circuit.