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.

A Dual Band RF Energy Harvester with Hybrid Threshold Voltage Self-Compensation

2016 ◽  
Vol 25 (06) ◽  
pp. 1650055 ◽  
Author(s):  
Lianxi Liu ◽  
Wenzhi Yuan ◽  
Junchao Mu ◽  
Zhangming Zhu ◽  
Yintang Yang
Keyword(s):  
Threshold Voltage ◽  
Energy Harvester ◽  
Impedance Matching ◽  
Forward Bias ◽  
Input Power ◽  
Dual Band ◽  
Maximum Efficiency ◽  
Cmos Process ◽  
Rf Energy ◽  
Rf Energy Harvester

Threshold voltage self-compensation technology (TVSC) has been widely used in RF energy harvester. In this paper, the influence of the size of rectifying transistors, the stages and compensation orders of the rectifier, and the impedance matching network on the performance of RF energy harvester has been studied. A dual band RF energy harvester with hybrid threshold voltage self-compensation (HTVSC) is proposed in this paper in 65-nm CMOS process according to the distribution characteristic of the ambient RF energy. By combining TVSC and the technology of weak forward bias between the source and body of the rectifying transistor, the threshold voltage of MOSFET can be dramatically decreased. The performance of the RF energy harvester has been improved using this new technology. The simulation results show that the proposed dual band RF energy harvester can acquire energy at the band of 900[Formula: see text]MHz and 2.4[Formula: see text]GHz. At 900[Formula: see text]MHz-band (825–960[Formula: see text]MHz), with 1[Formula: see text]M[Formula: see text] load resistor, the output voltage of the energy harvester can be over 1.0[Formula: see text]V with a minimum [Formula: see text]18[Formula: see text]dBm RF input power and a maximum 13.8% power conversion efficiency (PCE). At 2.4[Formula: see text]GHz-band (2.4–2.485[Formula: see text]GHz), the minimum input power can be as low as [Formula: see text]19[Formula: see text]dBm with a maximum efficiency of 16.8%.

scholarly journals RF Energy Harvesting System for Wireless Sensor Devices: A Review

2017 ◽  
Vol 5 (1) ◽  
pp. 1-5
Author(s):  
Bharat Mishra ◽  
Akhilesh Tiwari ◽  
Pankaj Agrawal
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Wireless Sensor ◽  
Rf Power ◽  
Power Harvesting ◽  
Sensor Devices ◽  
Energy Harvesting System ◽  
Operating Lifetime ◽  
Rf Energy ◽  
Rf Energy Harvester

In present era several companies and research groups are developing enhanced technologies which help to increase the operating lifetime of battery used in wireless sensor devices. Energy harvesting from ambient radio frequency becomes an attractive and trendy solution for energizing the devices of wireless sensor networks. Abundant availability of RF power from number of cell phone towers, Wi-Fi networks and DTH transmitters ensure that ample amount of power may be harvested from ISM band and after RF to DC conversion used in various low power applications. In this paper a thorough review on existing techniques of various RF power harvesting circuit comprised of different RF to DC converter and matching network with their characteristics and applications is presented. The possibility of harvesting circuit is also explored. Authors also discussed various design issues for developing the RF energy harvester.

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 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.

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