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Comparative Analysis and Improvement of Transmitting Efficiency in RF Wireless Charging System  

Son, Myung Sik (Department of Electronic Engineering, Sunchon National University)
Publication Information
Journal of the Semiconductor & Display Technology / v.20, no.4, 2021 , pp. 102-107 More about this Journal
Abstract
In this paper, the measurements of received power was shown and compared in two developed 5.8GHz 25W wireless charging systems. One is the system using commercial transmission antenna, and the other is the system using transmission antenna combined with metamaterial. The system combined with metamaterial shows higher received power due to negative reflective index of metamaterial. In addition, a comparative analysis of the systems shows that the transmission efficiency in the systems can decrease the real gain of transmission antenna due to higher side robe of beam pattern. The side robe beams of transmitting antenna interferes transmitted beam with the reflected beams from the bottom region due to the side robes. The failure problems of the RF wireless charging systems are discussed and proposed in order to charge mobile devices through the RF wireless charging system.
Keywords
Wireless Power Transmission System; Microwave; Integrated Receiver; Rectenna; Metamaterial; Antenna;
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