Feasibility Study of Wireless Power Transfer Using Metamaterial

Students of Indian Institute of Technology Guwahati, Amit Kumar Baghel, Shashank Satish Kulkarni won the award for research work of Feasibility Study of Wireless Power Transfer Using Metamaterial. They carried their project work under guidance of Dr. Sisir Kumar Nayak, D. Senthil Kumar.

Wireless power transfer (WPT) is the method to transfer power from the source to load without cables or wires started way back in 1903 by Dr. Nicolas Tesla. Nowadays this technique is being used in many applications such as biomedical transplants, UAVs, mobile chargers, electric vehicle charging, antennas etc. But the major problem with the WPT is the decrease in the efficiency as the distance is increased. In near field, the strength of the field varies inversely as the square of distance and cube of distance for far field. One of the novel ways by which we can increase the intensity of field, thus power transfer is with the help of meta-material.

They are manually engineered with negative refractive index and help in beam focusing. It can act as a super-lens. My innovation is about increasing the efficiency of far-field WPT using metamaterial. The metamaterial pattern is made on the 1. 6 mm thick double-sided FR4 sheet (dielectric constant 0.02) having 0.017 mm thick copper plating on both side of the sheet. A total of 40 arrays having 8 unit cell in each is placed at an optimized distance from the aperture of the proposed horn antenna (Tx antenna). The electric field at the distance of 6 m is measured using the D-dot sensor. The receiver antenna is 2×2 patch antenna having RF to DC conversion schottky diode and matching circuit. To charge the batteries of the cellphone (2900 mAh, 3.8 V), the zener diode with RC filter is placed after the matching circuit. An increase in twice the electric field , thus the received power is seen with the proposed antenna and meta-material.

The Hon’ble President of India, Shri Ram Nath Kovind awarded the Gandhian Young Technological Innovation (GYTI) Award to Amit Kumar Baghel, Shashank Satish Kulkarni, Indian Institute of Technology Guwahati at the GYTI 2018 Awards function held at Rashtrapati Bhawan on March 19, 2018.

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