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Received: 25 December 2018 Accepted: 10 January 2019 Wireless Power Transfer (WPT) system is an alternative and promising candidate for charging need of many electrical devices and equipment such as electric vehicles, biomedical implants, portable tools, smart phones and network sensors. Most widely used WPT techniques are inductive coupling and magnetic resonance coupling (MRC). In this paper, modeling and analysis of mid-range and mid-power four-resonator coil system for WPT is presented. In the proposed system, comparative analysis of the efficiency and transferred power for different coil structures and topologies such as Two-coil, Three-coil and Four-resonator coil using Keysight ADS tool has been carried out. From the results, the Power Transmission efficiency (PTE) and the transferred power in the proposed four-resonator coil system are 74.670 % and 3.8 W for circular coil structure, and 81.487 % and 4.7 W for rectangular coil structure at 13cm distance respectively. The findings of this research show that the four-resonator coil system with rectangular structures is the most desirable option for Power and efficiency improvement.

Comparative Analysis of Rectangular and Circular Four-resonator Coil System for Wireless Power Transfer Using Magnetic Resonance Coupling Technique