scholarly journals Simple Adaptive Rectifier with High Efficiency over a Range of 21 dBm Input Power for RF Energy Harvesting Applications

2021 ◽  
pp. 8-15
Author(s):  
Eman M. Abdelhady ◽  
◽  
Hala M. Abdelkader ◽  
Amr A. Al-Awamry
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Breakdown Voltage ◽  
Adaptive Design ◽  
High Efficiency ◽  
Power Level ◽  
Input Power ◽  
Rf Energy Harvesting ◽  
High Input Power ◽  
Rf Energy

This paper presents a novel simple adaptive and efficient rectifier for Radio Frequency (RF) energy harvesting applications. Traditional rectifiers have maximum RF-DC Power Conversion Efficiency (PCE) over a narrow range of RF input power due to diode breakdown voltage restrictions. The proposed adaptive design helps to extend the PCE over a wider range of RF input power at 2.45GHz using a simple design. Two alternative paths arecontrolled depending on the RF input power level. Low input power levels activate the first path connected to a single rectifier; low power levels make the diode operate below its breakdown voltage and therefore avoiding PCE degradation. High input power levels activate the second path dividing it into three rectifiers. This keeps input power at each rectifier at a low power level to avoid exceeding the diode break down voltage. Simulated PCE of this work is kept above 50% over a range of 21.4 dBm input power from -0.8dBm to 20.6dBm.

scholarly journals High-Efficiency Triple-Band RF-to-DC Rectifier Primary Design for RF Energy-Harvesting Systems

Telecom ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 271-284
Author(s):  
Maria S. Papadopoulou ◽  
Achilles D. Boursianis ◽  
Christos K. Volos ◽  
Ioannis N. Stouboulos ◽  
Spyridon Nikolaidis ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
High Efficiency ◽  
Feasible Solution ◽  
Dual Band ◽  
Rf Energy Harvesting ◽  
Frequency Bands ◽  
Initial Design ◽  
Rf Energy ◽  
Triple Band

Radio Frequency (RF) energy harvesting has been emerged as a potentially reliable method to replace the costly and difficult to maintain source of low-power wireless sensor networks. A plethora of dual-band rectifier designs has been proposed in the literature operating in various frequency bands. In this paper, a triple-band RF-to-DC rectifier that operates in the frequency bands of LoRaWAN, GSM-900, and WiFi 2.4 GHz is presented. The system is composed of an impedance-matching circuit, an RF-to-DC rectifier, that converts the ambient RF energy into DC voltage able to feed low-power devices, and an output load. The proposed system resonates at three different frequencies of 866 MHz, 948 MHz and 2423 MHz, which fall within the aforementioned frequency bands of interest. The feasible solution of the proposed system was based on a dual-band rectifier operating in the frequency bands of LoRaWAN and GSM-900. A series of shunt stubs was utilized in the initial design to form the feasible solution of the proposed system. The proposed triple-band rectifier was optimized using a powerful optimization algorithm, i.e., the genetic algorithm. The overall system exhibited improved characteristics compared to the initial design in terms of its resonance. Numerical results demonstrated that the overall system exhibited an efficiency of 81% with 3.23 V of the output voltage, for an input power of 0 dBm and a load of 13 kOhm.

scholarly journals RF Energy Harvesting System Based on an Archimedean Spiral Antenna for Low-Power Sensor Applications

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1318 ◽  
Author(s):  
Antonio Alex-Amor ◽  
Ángel Palomares-Caballero ◽  
José Fernández-González ◽  
Pablo Padilla ◽  
David Marcos ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Power Level ◽  
Storage Capacitor ◽  
Spiral Antenna ◽  
Archimedean Spiral ◽  
Rf Energy Harvesting ◽  
Correct Operation ◽  
Energy Harvesting System ◽  
Rf Energy

This paper presents a radiofrequency (RF) energy harvesting system based on an ultrawideband Archimedean spiral antenna and a half-wave Cockcroft-Walton multiplier circuit. The antenna was proved to operate from 350 MHz to 16 GHz with an outstanding performance. With its use, radio spectrum measurements were carried out at the Telecommunication Engineering School (Universidad Politécnica de Madrid) to determine the power level of the ambient signals in two different scenarios: indoors and outdoors. Based on these measurements, a Cockcroft-Walton multiplier and a lumped element matching network are designed to operate at 800 MHz and 900 MHz frequency bands. To correct the frequency displacement in the circuit, a circuit model is presented that takes into account the different parasitic elements of the components and the PCB. With an input power of 0 dBm, the manufactured circuit shows a rectifying efficiency of 30%. Finally, a test is carried out with the full RF energy harvesting system to check its correct operation. Thus, the RF system is placed in front of a transmitting Vivaldi antenna at a distance of 50 cm. The storage capacitor has a charge of over 1.25 V, which is enough to run a temperature sensor placed as the load to be supplied. This demonstrates the validity of the RF energy harvesting system for low-power practical applications.

scholarly journals Self-Adaptive Rectenna with High Efficiency over a Wide Dynamic Range for RF Energy Harvesting Applications

2021 ◽  
pp. 67-75
Author(s):  
Eman M. Abdelhady ◽  
◽  
Hala M. Abdelkader ◽  
Amr A. Al-Awamry
Keyword(s):  
Power Distribution ◽  
Adaptive Design ◽  
High Efficiency ◽  
Dynamic Range ◽  
Power Level ◽  
Input Power ◽  
Distribution Method ◽  
High Input Power ◽  
Wide Range ◽  
Voltage Doubler

This paper presents a novel simple adaptive and efficient rectenna with automatic power distribution to achieve high radio frequency-direct current (RF-DC) power conversion efficiency (PCE) over a wide range of RF input power. This design employs two rectifier paths operating at low and high-power levels, respectively. Automatic power distribution method exploits the power-dependent input impedance of the rectifier and routes the RF input power into the assigned path according to the input power level. A distinctive enhancement in the rectifier dynamic range is achieved when dividing the high path power equally into two or more parallel diode cells, which helps the high path to camouflage the diode breakdown voltage in case of high input power level. The proposed adaptive design applies two different rectifier topologies, one by using shunt diode topology and the other by using voltage doubler topology at 2.45 GHz. Simulated PCE of this work is kept above 50% over a range of 25.1 dBm from -5.7 to 19.4 dBm of RF input power using shunt diode topology and over a range of 30 dBm from -6.3 to 23.7 dBm of RF input power using voltage doubler topology.

A Broadband High-Efficiency RF Rectifier for Ambient RF Energy Harvesting

2020 ◽  
Vol 30 (12) ◽  
pp. 1185-1188
Author(s):  
Wenbo Liu ◽  
Kama Huang ◽  
Tao Wang ◽  
Zhuoyue Zhang ◽  
Jing Hou
Keyword(s):  
Energy Harvesting ◽  
High Efficiency ◽  
Rf Energy Harvesting ◽  
Rf Energy
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