Wireless Power Transfer System Design for Biomedical Implants at 2.45 GHz

This paper presents a simple and efficient wireless power transfer (WPT) system design for charging the implantable biomedical devices in the far-field region of antenna. The proposed system is designed to operate at the industrial, scientific, and medical (ISM) of 2.45 GHz. The WPT link is constructed with a simple patch antenna used as a transmitting (Tx) element and a miniaturized monopole antenna implanted in a single layer skin tissue model is considered as a receiving (Rx) element. To reflect the practical application scenario of the proposed design, the specific absorption rate (SAR) analysis is performed. Also, the lateral and angular misalignment is studied for the proposed design. Finally, the prototype of the Tx and Rx elements are fabricated and experimentally verified by using skin mimicking gel. The measured result shows good agreement with the simulated one.