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Feasibility Study Of Wireless Power Transfer Using Metamaterial
Project Description :

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. the future applications of wireless power transfer will be in solar-powered satellite (sps), high altitude platform (hap) systems, energy harvesting instruments and many more. it can be used in defense sectors to charge the batteries of a walkie-talkie, phones, etc. in far off places where there is no or fewer power supplies by conventional electric and electronic devices. in far of places like leh, ladakh and border areas, it is very hard to carry the batteries for communication and find the power supply round the clock. there with the help of repeaters the power can be transferred wirelessly. another important security machine is unmanned air vehicle i.e. uav. it can be used as a source of power so as to charge the auxiliary equipment’s batteries which are difficult to reach manually. soldiers using night vision lights can use them easily without worrying about the wires surrounding their body. they can move freely with the batteries being charged wirelessly. 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. the power received will be more if the transmitter is at the line of sight with the receiver which is not possible every time for moving receiver. one of the novel ways by which we can increase the intensity of field thus power transfer is with the help of metamaterial. they are manually engineered with negative refractive index and help in beam focusing. it can act as a superlens. 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 (see fig. 1) in each is placed at an optimized distance from the aperture of the horn antenna (tx antenna). the electric field at the distance of 6m is measured using the d-dot sensor. the optimized distance is found out by measuring the maximum value of the output radio frequency voltage given by d-dot sensor on the digital signal oscilloscope. fig. 2 shows the schematic of the experiment. the receiver antenna is 2x2 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. the schematic diagram of the same is shown in the fig. 3. the practical setup is shown in fig. 4. (the figures are uploaded)

 
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Project Details :
  • Date : Nov 16,2017
  • Innovator : Amit kumar baghel
  • Team Members : Shashank Kulkarni
  • Guide Name : Ssir Kumar Nayak
  • University : Indian Institutes of Technology Guwahati
  • Submission Year : 2018
  • Category : Electrical, Instrumentation & Related Fields
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