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

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 shows low mutual inductance and transfer efficiency required within the operating distance of 1 cm to 3 cm and ratio of the current between the loops was done by varying the value of loaded capacitor used in between loops. The results was changing rapidly due mismatch of impedance between antennas at different distance. Initially simulation of antenna designs were not performing therefore a new design was proposed. All antennas are first impedance matched at 1 cm but after optimization proposed antenna was matched at 3 cm. The proposed loop design show better transfer efficiency for WPT up to 3 cm. In this paper, receiving antenna is placed in different close proximity from 1 cm to 5 cm with respective to transmitting antenna. The results of conventional loop and single current-controlled loop and proposed multi loop antenna shows that transfer efficiency of the proposed multi loop antenna is better from others and maintaining low mutual inductance at given distance. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2472–2476, 2016