scholarly journals Wireless Power Transfer

2021 ◽  
Author(s):  
Colin Sokol Kuka
Keyword(s):  
Power Transmission ◽  
Near Field ◽  
Wireless Power Transfer ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Remote Locations ◽  
Consumer Electronic ◽  
Wireless Charge ◽  
The Internet Of Things

In the recent years, the wireless power transfer technique has attracted a lot of attention in research. As a result, it is becoming an increasingly popular technology in consumer electronic devices and electric vehicles. However, there are other methods in which energy could be transmitted, and they could be further classified according to their working ranges, namely the near-field and the far-field transmission. In this chapter, an overview on the principles of different types of wireless power transmission is described. Then, the investigation of the receiver block is discussed through studying the features of rectifier technologies. Later, the book continues to describe the Rectenna system (rectifying antenna) adopted to the Internet of Things (IoT) wireless charge in remote locations.

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 Wireless Power Transfer Through Simultaneous Near-Field Focusing and Far-Field Synthesis

2019 ◽  
Vol 67 (8) ◽  
pp. 5623-5633 ◽  
Author(s):  
Rafael Gonzalez Ayestaran ◽  
German Leon ◽  
Marcos R. Pino ◽  
Paolo Nepa
Keyword(s):  
Near Field ◽  
Wireless Power Transfer ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Encryption Techniques and Wireless Power Transfer Schemes

2018 ◽  
Vol 9 (1) ◽  
pp. 183
Author(s):  
Nur Hazwani Hussin
Keyword(s):  
Electromagnetic Radiation ◽  
Near Field ◽  
Wireless Power Transfer ◽  
Capacitive Coupling ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Resonant Coupling ◽  
Coupling Technique ◽  
Main Factors

<p>Wireless power transfer (WPT) is one of the most useful ways to transfer power. Based on power transfer distances, the WPT system can be divided into three categories, namely, near, medium, and far fields. Inductive coupling and capacitive coupling contactless techniques are used in the near-field WPT. Magnetic resonant coupling technique is used in the medium-field WPT. Electromagnetic radiation is used in the far-field WPT. This paper reviews the techniques used in WPT. In addition, energy encryption plays a major role in ensuring that power is transferred to the true receiver. Therefore, this paper reviews the energy encryption techniques in WPT. A comparison between different techniques shows that the distance, efficiency, and number of receivers are the main factors in selecting the suitable energy encryption technique.</p>

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