Listening to the Whispers: Enhanced SWIPT Wake-Up Receiver for IoT Sensors

To address the challenges of energy constraints in Wireless Sensor Networks and Internet of Things devices, this study presents an enhanced wake-up receiver for Simultaneous Wireless Information and Power Transfer applications. The proposed design incorporates a passive 2 × 2 Multiple-Input Multiple-Output antenna configuration, which enhances the sensitivity and reliability of detecting wake-up signals under diverse environmental conditions. The architecture also includes a two-stage rectifier and an operational amplifier to efficiently harvest energy from radio-frequency signals. An important breakthrough is the integration of backscattering technology, which allows the wake-up receiver to support battery-less operations in Internet of Things networks. This effectively minimizes energy consumption and prolongs the lifespan of the Internet of Things devices. The double function of the receiver to activate sensor nodes and transmit data through radio frequency signals provides a practical and environmentally friendly solution for the Internet of Things.