Enabling a constant and efficient flow of wireless energy for IoT sensors

This work describes the design of an energy efficient transmitter for wireless power transfer applications. The main objective is to power up, efficiently, an IoT sensor moving on a multi-path environment. In this scenario a flexible transmitter will be operated in order to maintain a constant power delivery to the sensor, while maximizing both transmitter and receiver energy efficiency conversions. The mechanism operates on the basis of a backscatter circuit attached to the IoT sensor, creating a feedback link that feeds the transmitter with its Received Signal Strength (RSSI). Experimental results will be reported on a system working at 5.83 GHz for wireless power transfer and 3.45 GHz for the backscattering link.