High-Performance Radiative Near-Field Transmitter for Wireless Power Transfer to Biomedical Implants

In this paper, we propose a high-performance transmitting antenna (Tx) for wireless power transfer (WPT) to biomedical implants. A bipolar radiating plane is configured to obtain optimal current distribution on Tx’s surface. A slotted-ring excitation structure is implemented to centrally feed radiating patch. Meanwhile, an impedance matching network (IMN) is proposed and attached to the excitation ring to match the antenna impedance to the source impedance. Moreover, an implantable receiver (Rx) is employed to verify the Tx’s performance. Verification results show that the proposed antenna can achieve a transmission efficiency of up to -17.82dB to an implantation depth of 20mm.