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.
Highlights
Nowadays, the Internet-of-Things (IoT) and Bluetooth low-energy (BLE) devices have made a smart environment by using wireless sensors and communication protocols
It can be used to power-up various Internet of Things (IoT)/wearable devices
Summary
The Internet-of-Things (IoT) and Bluetooth low-energy (BLE) devices have made a smart environment by using wireless sensors and communication protocols. These technologies transmit data for making decisions related human issues, health cares, and automation of the facilities. Communication without any interruptions and long battery life are the most challenging requirements for these aims. Wireless sensors need continuous power, which, with the conventional methods, suffer from the short lifetime of the batteries. An energy harvester (EH) and low-power devices may not be installed under normal conditions, and their batteries cannot be changed [1,2].
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