scholarly journals A High-Efficiency and Wide-Input Range RF Energy Harvester Using Multiple Rectenna and Adaptive Matching

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1023
Author(s):  
Hamed Abbasizadeh ◽  
Arash Hejazi ◽  
Behnam Samadpoor Rikan ◽  
Sang Yun Kim ◽  
Jongseok Bae ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Energy Harvester ◽  
High Efficiency ◽  
Power Level ◽  
Schottky Diodes ◽  
Smart Devices ◽  
Dc Voltage ◽  
Input Range ◽  
Rf Energy ◽  
Rf Energy Harvester

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.

An Optimized 2.4GHz RF Energy Harvester for Energizing Low-Power Wireless Sensor Platforms

2019 ◽  
Vol 28 (06) ◽  
pp. 1950104
Author(s):  
Chandra Shekhar ◽  
Shirshu Varma
Keyword(s):  
Low Power ◽  
Energy Harvester ◽  
Power Level ◽  
Schottky Diodes ◽  
Impedance Matching ◽  
Maximum Power ◽  
Sensor Nodes ◽  
Sensor Platforms ◽  
Rf Energy ◽  
Rf Energy Harvester

The lifetime of battery-operated sensor platforms (i.e., sensor nodes) is a critical issue. The replacement of their batteries is quite a challenging task if these platforms are deployed for detecting events in inaccessible geographical areas (e.g., forest). This paper describes an optimized RF energy harvester/scavenger (consisting of an antenna, impedance matching circuit and rectifier) for energizing low-power sensor platforms (electronic systems). Few nonmatched rectifiers (using HSMS-285X Schottky diodes) are fabricated to characterize the input impedance for different sets of parameters. After characterization a proper impedance matching circuit is integrated for the maximum power transfer from antenna to rectifier. It is shown that a single stage of RF rectifier is enough to produce output voltage of 1.8[Formula: see text]V. Very few realizations of RF energy harvester are reported in the literature under 2.4[Formula: see text]GHz ISM band category. Furthermore, high-gain microstrip patch array antennas are fabricated to capture the maximum power from the surroundings. The maximum harvesting range of 0.92[Formula: see text]m is obtained at 27[Formula: see text]dBm transmitting power level.

scholarly journals High Efficiency RF Energy Harvester for IoT Embedded Sensor Nodes

2019 ◽  
Author(s):  
Stylianos D. Assimonis ◽  
Spyridon N. Daskalakis ◽  
Vincent Fusco ◽  
Manos M. Tentzeris ◽  
Apostolos Georgiadis
Keyword(s):  
Energy Harvester ◽  
High Efficiency ◽  
Sensor Nodes ◽  
Rf Energy ◽  
Rf Energy Harvester

scholarly journals A concurrent 915/2440 MHz RF energy harvester

2016 ◽  
Vol 8 (3) ◽  
pp. 405-413 ◽  
Author(s):  
Ludvine Fadel ◽  
Laurent Oyhenart ◽  
Romain Bergès ◽  
Valérie Vigneras ◽  
Thierry Taris
Keyword(s):  
Patch Antenna ◽  
Power Efficiency ◽  
Energy Harvester ◽  
Dipole Antenna ◽  
Dual Band ◽  
Far Field ◽  
Dc Voltage ◽  
Received Power ◽  
Rf Energy ◽  
Rf Energy Harvester

This paper presents the development of two dual-band radio-frequency (RF) harvesters optimized to convert far-field RF energy to DC voltage at very low received power. The first one is based on a patch antenna and the second on a dipole antenna. They are both implemented on a standard FR4 substrate with commercially off-the-shelf devices. The two RF harvesters provide a rectified voltage of 1 V for a combined power, respectively, of −19.5 dBm at 915 MHz, −25 dBm at 2.44 GHz, of −20 dBm at 915 MHz, and −15 dBm at 2.44 GHz. The remote powering of a clock consuming 1 V/5 µA is demonstrated, and the rectenna yields a power efficiency of 12%.

scholarly journals Design of a Highly Efficient Wideband Multi-Frequency Ambient RF Energy Harvester

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 424
Author(s):  
Sunanda Roy ◽  
Jun-Jiat Tiang ◽  
Mardeni Bin Roslee ◽  
Md. Tanvir Ahmed ◽  
Abbas Z. Kouzani ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Energy Harvester ◽  
Impedance Matching ◽  
Urban Region ◽  
Rf Power ◽  
Ambient Conditions ◽  
Frequency Bands ◽  
Rf Energy ◽  
Spectral Survey ◽  
Rf Energy Harvester

For low input radio frequency (RF) power from −35 to 5 dBm, a novel quad-band RF energy harvester (RFEH) with an improved impedance matching network (IMN) is proposed to overcome the poor conversion efficiency and limited RF power range of the ambient environment. In this research, an RF spectral survey was performed in the semi-urban region of Malaysia, and using these results, a multi-frequency highly sensitive RF energy harvester was designed to harvest energy from available frequency bands within the 0.8 GHz to 2.6 GHz frequency range. Firstly, a new IMN is implemented to improve the rectifying circuit’s efficiency in ambient conditions. Secondly, a self-complementary log-periodic higher bandwidth antenna is proposed. Finally, the design and manufacture of the proposed RF harvester’s prototype are carried out and tested to realize its output in the desired frequency bands. For an accumulative −15 dBm input RF power that is uniformly universal across the four radio frequency bands, the harvester’s calculated dc rectification efficiency is about 35 percent and reaches 52 percent at −20 dBm. Measurement in an ambient RF setting shows that the proposed harvester is able to harvest dc energy at −20 dBm up to 0.678 V.

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