A new compact wireless power transfer system using C-shaped printed resonators

This paper presents a simple and compact design for an efficient short-range wireless power transfer (WPT) system. The proposed design is composed of two identical transmitting (TX) and receiving (RX) substrates. Each substrate has a micro strip feed line and C-shaped edge coupled resonator. A partial ground plane is added under the feeding line to guide the transmitted/received signals. The C-shaped resonator is loaded by chip capacitor for miniaturization. A circuit model has been extracted for verification of the design theory. The proposed design achieves a WPT efficiency of 69% at 1 GHz and a transmission distance of 15mm.