A Fully Integrated Pinless Long-Range Power Supply with On-Chip Antenna for Scavenging-Based RFID Tag Powering

This paper presents a fully integrated pinless wireless power supply that scavenges RF energy from the air for RFID tag powering. The chip is composed of an integrated on-chip meandering antenna with rectifier in a 130 nm CMOS technology. The generated output voltage approximately reaches 1.55 V and 700 mV from a 31 dBm EIRP source at a distance of 40 cm and 60 cm respectively at a frequency of 1.45 GHz with 20 MHz acceptable bandwidth. The antenna has a meandering shape and is optimized to have higher radiation resistance at the predetermined available area. The rectifier uses a 20-stage voltage-doubler topology to rectify the incoming power. The die area is only 4400 mum x 1500 mum.