A Fully-Integrated CMOS Dual-Band RF Energy Harvesting Front-End Employing Adaptive Frequency Selection
Wen Xun Lian, Harikrishnan Ramiah, Gabriel Chong, Kishore Kumar Pakkirisami Churchill, Nai Shyan Lai, Saad Mekhilef, Yong Chen, Pui‐In Mak, Rui P. Martins
Abstract
This paper proposes a fully-integrated dual-band CMOS RF energy harvesting (RFEH) front-end with an adaptive frequency selector that can select between two harvesting frequencies of 1.9 GHz and 2.4 GHz. The RFEH front end includes two pairs of on-chip LC networks and rectifiers that convert the harvested RF power into a usable DC voltage. An internal control logic circuit, powered by an auxiliary path, selects the input harvesting frequency band with a higher power output to the load. The proposed dual-band adaptive frequency selection RFEH system achieves a peak PCE of 40% and 32% at 1.9 GHz and 2.4 GHz, respectively.