Power Waveforming: Wireless Power Transfer Beyond Time Reversal

2016 ◽  
Vol 64 (22) ◽  
pp. 5819-5834 ◽  
Author(s):  
Meng-Lin Ku ◽  
Yi Han ◽  
Hung-Quoc Lai ◽  
Yan Chen ◽  
K. J. Ray Liu
Keyword(s):  
Time Reversal ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Asynchronous Focusing Time Reversal Wireless Power Transfer for Multi-users with Equal Received Power Assignment

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Zhouming Yang ◽  
Deshuang Zhao ◽  
Jinlong Bao ◽  
Xin Ma ◽  
Lin Hu ◽  
...  
Keyword(s):  
Time Reversal ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Power Assignment ◽  
Wireless Power ◽  
Received Power

scholarly journals Wireless Power Transfer Based on Microwaves and Time Reversal for Indoor Environments

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 114897-114908 ◽  
Author(s):  
Bing Li ◽  
Shiqi Liu ◽  
Hong-Lin Zhang ◽  
Bin-Jie Hu ◽  
Deshuang Zhao ◽  
...  
Keyword(s):  
Time Reversal ◽  
Wireless Power Transfer ◽  
Indoor Environments ◽  
Power Transfer ◽  
Wireless Power

scholarly journals A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hong Soo Park ◽  
Sun K. Hong
Keyword(s):  
Time Reversal ◽  
Power Transmission ◽  
Linear Array ◽  
Wireless Power Transfer ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Dynamic Propagation ◽  
Received Power ◽  
Indoor Scenarios

AbstractFor far-field wireless power transfer (WPT) in a complex propagation environment, a time-reversal (TR) based WPT that can overcome the drawbacks of conventional beamforming (BF) by taking advantage of multipath has been recently proposed. However, due to the WPT performance of BF and TR depending on the complexity of the propagation environment, the performance prediction between BF versus TR would be required. We present a detailed and generalized analysis of the recently proposed performance metric referred to as the peak received power ratio (PRPR) for linear array-based WPT. Here, the effectiveness of PRPR is verified via measurement for free space and indoor scenarios. The results demonstrate that PRPR is directly related to the complexity of the propagation environment and the corresponding power transmission capability of BF and TR. That is, the higher the complexity, the greater the value of PRPR and TR outperforms BF with higher peak power given the same average transmit power and vice versa. The mode decision between BF and TR based on PRPR potentially promises efficient far-field WPT even in a dynamic propagation environment.

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.

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