An Efficient Metasurface-Based Wireless Power Transfer System for Implantable Medical Devices

Document Type : Original Article


Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Babol, Iran.


In this paper, by designing a double metasurface, an efficient wireless power transfer system is proposed for implementable medical applications. This system operates at 2.45 GHz in the medical frequency band and consists of two antennas, a transmitter, and a receiver, along with a double metasurface structure embedded between them. A circular patch antenna for the transmitting end and a small loop antenna on the receiving side are designed. To enhance the efficiency of the system, a double metasurface consisting of two arrays of hexagonal ring unit cells is located between the receiver and transmitter antennas. As the receiver antenna is designed for operation in a human body medium, the effects of antenna displacement as well as material uncertainty on the efficiency of total structure are investigated in which reasonable stability concerning these variations is observed. Finally, as this system is aimed to operate in the human body, the safety of this system has also been approved through the calculation of the specific absorption rate (SAR). The proposed wireless power transfer system can overcome the challenges of using implementable medical electronic devices such as battery-replacing surgeries.


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