scholarly journals Compact and High-Efficiency Rectenna for Wireless Power-Harvesting Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Dalia H. Sadek ◽  
Heba A. Shawkey ◽  
Abdelhalim A. Zekry
Keyword(s):  
High Efficiency ◽  
Single Layer ◽  
Load Resistance ◽  
Center Frequency ◽  
Wireless Power ◽  
Power Harvesting ◽  
Rectifier Circuit ◽  
Half Wave ◽  
Voltage Doubler ◽  
Conversion Efficiencies

A compact, single-layer microstrip rectenna for dedicated far-field RF wireless power-harvesting applications is presented. The proposed rectenna circuit configurations including multiband triple L-Arms patch antenna with diamond slot ground are designed to resonate at 10, 13, 17, and 26 GHz with 10 dB impedance bandwidths of 0.67, 0.8, 2.45, and 4.3 GHz, respectively. Two rectifier designs have been fabricated and compared, a half wave rectifier with a shunted Schottky diode and a voltage doubler rectifier. The measured and simulated maximum conversion efficiencies of the rectifier using the shunted diode half-wave rectifier are 41%, and 34%, respectively, for 300 Ω load resistance, whereas they amount to 50% and 43%, respectively, for voltage doubler rectifier with 650 Ω load resistance. Compared to the shunted rectifier circuit, it is significant to note that the voltage doubler rectifier circuit has higher efficiency. Both rectifier’s circuits presented are tuned for a center frequency of 10 GHz and implemented using 0.81 mm thick Rogers (RO4003c) substrate. The overall size of the antenna is 16.5 × 16.5 mm2, and the shunted rectifier is only 13.3 × 8.2 mm2 and 19.7 × 7.4 mm2 for the voltage doubler rectifier. The antenna is designed and simulated using the CST Microwave Studio Suite (Computer Simulation Technology), while the complete rectenna is simulated using Agilent’s ADS tool with good agreement for both simulation and measurements.

scholarly journals Investigation of Rectifier Circuit Configurations for Microwave Power Transmission System Operating at S Band

2015 ◽  
Vol 5 (5) ◽  
pp. 967 ◽  
Author(s):  
Chuc Huu Doan ◽  
Duong Gia Bach
Keyword(s):  
Microwave Power ◽  
Power Transmission ◽  
Load Resistance ◽  
Transmission System ◽  
Rectifier Circuit ◽  
Power Transmission System ◽  
Half Wave ◽  
Measurement Results ◽  
Voltage Doubler ◽  
System Operating

The purpose of this work is to propose rectifier circuit topologies for microwave power transmission system operating at ISM band. This paper particularly presents in detail the proposed rectifier circuit configurations including series diode half wave rectifier and voltage doubler rectifier. The maximum conversion efficiency of rectifier using series diode half wave rectifier is 40.17 % with 220 W load resistance whereas it is 70.06 % with 330 W load resistance for voltage doubler rectifier. Compared to the series rectifier circuit, it is significant to note that the voltage doubler rectifier circuit has higher efficiency. The circuits presented are tuned for a center frequency of 2.45 GHz. The rectifiers were fabricated using microstrip technology. The design, fabrication and measurement results were obtained using a well-known professional design software for microwave engineering, Advanced Design System 2009 (ADS 2009). All design and measurement results will be reported.

scholarly journals Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1112
Author(s):  
Yu-En Wu ◽  
Jyun-Wei Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Leakage Inductance ◽  
Power Switch ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Voltage Stress ◽  
Voltage Doubler

This study developed a novel, high-efficiency, high step-up DC–DC converter for photovoltaic (PV) systems. The converter can step-up the low output voltage of PV modules to the voltage level of the inverter and is used to feed into the grid. The converter can achieve a high step-up voltage through its architecture consisting of a three-winding coupled inductor common iron core on the low-voltage side and a half-wave voltage doubler circuit on the high-voltage side. The leakage inductance energy generated by the coupling inductor during the conversion process can be recovered by the capacitor on the low-voltage side to reduce the voltage surge on the power switch, which gives the power switch of the circuit a soft-switching effect. In addition, the half-wave voltage doubler circuit on the high-voltage side can recover the leakage inductance energy of the tertiary side and increase the output voltage. The advantages of the circuit are low loss, high efficiency, high conversion ratio, and low component voltage stress. Finally, a 500-W high step-up converter was experimentally tested to verify the feasibility and practicability of the proposed architecture. The results revealed that the highest efficiency of the circuit is 98%.

Design and Analysis of Inset Fed Wide-Band Rectenna with Defected Ground Structure

2019 ◽  
Vol 29 (03) ◽  
pp. 2050047
Author(s):  
Asmita Rajawat ◽  
P. K. Singhal
Keyword(s):  
Power Transmission ◽  
Wide Band ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Wireless Power ◽  
Frequency Range ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Feed Line ◽  
Voltage Doubler

The design proposed and fabricated in this paper is a slotted wide-band rectenna with the inclusion of Defected Ground Structure (DGS) which can harvest RF energy in the frequency range of 5.336–6.194[Formula: see text]GHz with a center frequency of 5.8[Formula: see text]GHz. For the development of antenna, FR4 substrate having a dielectric permittivity of 4.3 has been adopted. Two parallel slots on the patch are incorporated on either side of the feed line to obtain the wide-band structure. Dumbbell-shaped DGS is also incorporated exactly underneath the feed line to increase the gain of the antenna. HSMS-285C Schottky diode has been used for the implementation of the rectifier circuit and a Greinacher voltage doubler has been chosen. ADS design software has been used for rectifier simulation and CST has been used for the designing of the antenna. Current behavior on the patch can be investigated to explore the wide-band mechanism. The antenna operates in the frequency range of 5.336–6.194[Formula: see text]GHz and with VSWR less than 2, which corresponds to 16.07% impedance bandwidth. The antenna achieves a gain of 6.189[Formula: see text]dB and a directivity of 8.776[Formula: see text]dBi. The conversion efficiency of the rectifier was optimized to 75% at 5.8[Formula: see text]GHz. The proposed design gave an output of 3.2[Formula: see text]V which can be used under numerous energy harvesting and wireless power transmission applications.

scholarly journals Low-Cost Air Gap Metasurface Structure for High Absorption Efficiency Energy Harvesting

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Wei Hu ◽  
Zhao Yang ◽  
Fading Zhao ◽  
Guangjun Wen ◽  
Jian Li ◽  
...  
Keyword(s):  
High Efficiency ◽  
Layer Structure ◽  
Low Cost ◽  
Single Layer ◽  
Absorption Efficiency ◽  
Air Gap ◽  
Wireless Power ◽  
Low Loss ◽  
Dielectric Substrates ◽  
High Absorption

This manuscript deals with the design of a metamaterial-based surface structure for high efficiency wireless power harvesting or collection. Differently from the previously presented structures which require the use of thicker and low-loss (and for this reason high cost) dielectric substrates, the presented work employs a dual-layer structure with a thin low-loss material and an air gap; they allow for the design of very high absorption efficiency metamaterial-based surfaces, with noticeably reduced costs. Furthermore, the air gap thickness can be used as a new degree-of-freedom (more easily adjustable than the thickness of a single-layer structure) for the optimization of other design requirements such as bandwidth or structure sizes. In comparison with other existing designs, the proposed metasurface shows a comparable absorption efficiency of 84.4% but with a larger power collection surface and lower costs.

scholarly journals A High-Efficiency Self-Synchronous RF–DC Rectifier Based on Time-Reversal Duality for Wireless Power Transfer Applications

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 90
Author(s):  
Ying Wang ◽  
Gao Wei ◽  
Shiwei Dong ◽  
Yazhou Dong ◽  
Xumin Yu ◽  
...  
Keyword(s):  
Time Reversal ◽  
High Efficiency ◽  
Design Method ◽  
Wireless Power Transfer ◽  
Operating Mode ◽  
Load Resistance ◽  
Input Power ◽  
Adjustment Process ◽  
Power Transfer ◽  
Wireless Power

An RF–DC rectifier is an important part in a wireless power transfer system. Diode-based rectifiers are widely used in low-power harvesting scenarios, and for high power, a transistor based on the time-reversal duality was proposed. This paper presents a high-efficiency self-synchronous RF–DC rectifier based on a waveform-guided design method and an improved rectification model of a commercial GaN device. The main contributions of this paper are that (1) an improved transistor model with correct reverse bias is built for accurate rectifier simulation, and (2) a new design method of self-synchronous RF–DC rectifier is proposed: as soon as the operating mode of the rectifier, input power, and DC load are set, matching and coupling network can be calculated directly based on waveform-guided method, thus design and adjustment process of a conventional power amplifier (PA) due to the duality between a PA and a rectifier would no longer be required. A 5.8 GHz self-synchronous RF–DC rectifier is designed for validation, and the optimum RF–DC conversion efficiency is 68% with 12 W input power as well as 19.9 V output DC potential with 50 Ω load resistance. The proposed rectifier is suitable for high input power rectification applications of wireless power transfer.

scholarly journals Experimental Comparison of Designed Inductance Coils for Wireless Power Transfer

2020 ◽  
Vol 16 (2) ◽  
pp. 102-109
Author(s):  
Viktor Shevchenko ◽  
Maksym Khomenko ◽  
Igor Kondratenko ◽  
Oleksandr Husev ◽  
Bohdan Pakhaliuk
Keyword(s):  
Single Layer ◽  
Wireless Power Transfer ◽  
Load Resistance ◽  
Experimental Comparison ◽  
Power Transfer ◽  
Wireless Power ◽  
High Input ◽  
Inductive Power Transfer ◽  
Different Types ◽  
Industrial Standards

Abstract The paper is devoted to the comparison of different types and different values of coils for inductive power transfer in the classical circuit. This topic is relevant with the growing demand and interest in wireless chargers and the diversity of inductance coils for wireless power transfer. The main geometric parameters affecting the coil efficiency are determined. For experimental verification the classical scheme for wireless power transfer is used based on a full-bridge inverter. Different coils at different distance between them, lateral misalignment and load resistance changed are tested. It is determined that single-layer coils have better transmit-receive efficiency than double-layer ones, especially with series-series compensation topology. The application of two-layer coils is recommended in case of high input current. The investigated samples have efficiency at the level of industrial standards. The design approach can be used for any level of power and application, including wireless charging of electric vehicle batteries.

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