Wireless power transfer in near-field communication using a current-controlled multi loops with a loaded capacitance

Abstract

Wireless power transfer (WPT) in near-field communication (NFC) using current-controlled multi loops with a loaded capacitance is demonstrated in this work. The proposed multi loops antenna design gave low mutual inductance and transfer efficiency required within the operating distance of 1cm to 3cm. The ratio of the current between the loops was done by varying the value of loaded capacitor used in between loops, due to that mismatch of impedance between antennas was observed. Initially antennas were matched at 1cm but after optimization of simulation, it was decided at 3cm performance has improved and resulted as reduced mutual inductance within communication distance of NFC. The proposed loop design has better transfer efficiency for WPT up to 3cms within NFC operating modes. In this project, receiving antenna is placed in different close proximity from 1cm to 5cm with respective to transmitting antenna. The results of conventional loop and single current controlled loop and proposed multi loop antenna show that transfer efficiency of the proposed multi loop antenna is better and satisfactory than others.