A High-Efficiency and Wide-Input Range RF Energy Harvester Using Multiple Rectenna and Adaptive Matching Hamed abbasizadeh by Hamed abbasizadeh, Arash hejazi, Behnam samadpoor rikan instant download after payment.

Abstract: In this paper, a Radio Frequency (RF) energy harvester (EH) system for Internet of Things
(IoT)‐related applications is presented. The proposed EH architecture operates at 5.2 GHz band and
utilizes multiple rectenna. This approach enhances the efficiency of the whole system over a wide
dynamic RF input range. In the presented circuit, configuration of the rectenna is controlled by
Field‐Programmable Gate Array (FPGA) with respect to the input power level of the received RF
input signal. In addition, an automatic adaptive matching based on the configuration of the
rectenna, level of the received signal, and load current adjusts the matching network. The rectenna
is realized through the Radio Frequency‐Direct Current (RF‐DC) converter composed of two
Schottky diodes and generates the output DC voltage. Finally, a buck‐boost converter provides the
flattened and fixed voltage for the IoT and wearable devices. The 5.2 GHz band reconfigurable
system demonstrates 67% high efficiency and 6.1 V output DC voltage where the power level of RF
input is +20 dBm. The main application of the proposed structure is for charging wearable smart
devices such as a smart watch and bracelet.