Antenna amplitude distributions for improved wireless power transmission efficiency

2003 ◽  
Author(s):  
S.S. Shaposhnikov ◽  
R.B. Vaganov ◽  
N.N. Voitovich
Keyword(s):  
Power Transmission ◽  
Transmission Efficiency ◽  
Wireless Power ◽  
Wireless Power Transmission

Compensating Resonant Frequency via Adjusting Adjustable Coil Automatically

2019 ◽  
Vol 12 (5) ◽  
pp. 432-438
Author(s):  
Jin Xu ◽  
Yuting Zhao
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Reference Value ◽  
Transmission Efficiency ◽  
Theoretical Research ◽  
Future Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Resonant Coupling ◽  
Transmission Distance

Background: Detuning is the main problem that affects the efficiency and transmission distance of the resonant coupling Wireless Power Transmission (WPT). The distance of load and the offset of the load position could cause serious detuning. Methods: This paper presents an adjustable coil in which inductance can be adjusted. Then a model of WPT was established that could compensate resonant frequency automatically using the adjustable coil. Next, the relationship between the primary resonant frequency and the transmission efficiency is analyzed from the circuit. The analysis proved that the design of the adjustable coil could improve the transmission efficiency of the WPT system. Finally, a prototype of WPT system was built. Results: The experimental results showed that WPT system with adjustable coil can improve the transmission efficiency which proves the theoretical research. At the same time, it has essential reference value for the future research of WPT. Conclusion: In this paper, aiming at the system detuning caused by some other factors, such as the position shift of the load during the wireless power transmission, an adjustable coil is proposed.

Wireless Power Transmission Efficiency for Microwave Rocket Using 28 GHz Gyrotron

2020 ◽  
Vol 57 (3) ◽  
pp. 632-635
Author(s):  
Kohei Shimamura ◽  
Maho Matsukura ◽  
Naoto Ozaki ◽  
Kaisei Miyawaki ◽  
Shigeru Yokota ◽  
...  
Keyword(s):  
Power Transmission ◽  
Transmission Efficiency ◽  
Wireless Power ◽  
Wireless Power Transmission

Pulse-Driving Based Magnetic Coupling Resonant Wireless Power Transmission System Research

2011 ◽  
Vol 378-379 ◽  
pp. 539-542
Author(s):  
Qiang Wang ◽  
Hong Li
Keyword(s):  
Optimization Design ◽  
Power Transmission ◽  
Magnetic Coupling ◽  
Transmission Efficiency ◽  
Transmission System ◽  
System Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Power Transmission System ◽  
Magnetic Resonances

This paper analyses and designs a kind of pulse-driving based wireless power transmission system via coupled magnetic resonances. It analyzes the influence of the related parameters on the transfer efficiency and transfer power of the system. The experiment tests the proposed wireless power transmission system, and the results show that the above relevant parameters should be comprehensively considered, in order to achieve the optimization design of the transmission efficiency or transmission power. The experiment results also show the validity of the theoretical analysis.

scholarly journals Feasibility study of microwave wireless powered flight for micro air vehicles

2017 ◽  
Vol 4 (2) ◽  
pp. 146-159 ◽  
Author(s):  
Kohei Shimamura ◽  
Hironori Sawahara ◽  
Akinori Oda ◽  
Shunsuke Minakawa ◽  
Sei Mizojiri ◽  
...  
Keyword(s):  
Power Transmission ◽  
Axial Ratio ◽  
Micro Air Vehicles ◽  
Transmission Efficiency ◽  
Input Power ◽  
Bend Angle ◽  
Back Side ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Air Vehicles

New small unmanned air vehicles designated as micro air vehicles (MAVs) are increasingly attractive for research, environmental observation, and commercial purposes. As described herein, the feasibility of a system for wireless power transmission via microwaves for MAVs was investigated. For its light weight and flexibility, a textile-based rectenna was proposed for microwave wireless power transmission of MAVs. To investigate bending effects on radiation performance, a microstrip patch antenna with a 5.8 GHz left-hand circular polarization was developed on a textile substrate. The antenna return loss, 20 dB, increased slightly with the antenna bending angle. An axial ratio <3 dB was maintained when the antenna bend angle was <30°. A rectification circuit was formed on the back side felt with sandwiched copper foil as a ground plate. Its weight per unit area was 0.08 g/m2, with maximum rectification efficiency of 58% with 100 Ω load at 63 mW input power. The average and maximum total transmission efficiency using the 5.8 GHz multiple rectenna with a 2.45 GHz retrodirective system were, respectively, 0.44 and 0.60%. The possibility and feasibility of microwave power transmission system using the textile-based rectenna were evaluated.

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