This is just a brief on WPT basic ideas for young Engineers. References will help to get more adequate knowledge and will create more thirst to get into the real world of WPT.

1. A Brief Basics on Wireless Power Transfer (WPT)
Dipra Paul
BSc. In EEE AUST, Bangladesh
MSc(ongoing) UNIST, Rep. of Korea.

2.  Introduction
 Mechanism
 Transmission Frequencies
 Rectenna and operating frequencies
 Advantages
 Disadvantages

3.  Transmission of power/electrical energy without the need for a physical
connection/link
 Wireless power transfer is useful to power electrical devices where
interconnecting wires are inconvenient, hazardous, or are not possible.
Introduction:

4.  Non Radiative/ Near Field:
 Magnetic coupling/ Inductive coupling
 Electric field coupling/ Capacitive
coupling
 Magnetic coupled Resonance
 Radiative/ Far field:
 Radio Frequency
 Leaser Beams

5.  To realize WPT let’s consider MPT
mechanisms
 Transfer of power through space
by means of microwaves
 Converts DC power to microwaves
 Transmits microwave radiation to
a target
 Target converts the Microwave
radiation back to DC power
WPT Mechanism:

6. Transmission Frequency:
 2.45 GHz
 5.8 GHz
 8.5 GHz
 10 GHz
 35 GHz
 2.45 GHz is the most efficient frequency to transmit microwaves.

7. Reception Antenna type and operating frequency:
 Printed Diplomo (2.45GHz)
 Circular patch (2.45GHz)
 Printed Dual rhombic (5.6GHz)
 Square Patch (8.51GHz)
 A receiver has to receive and convert the microwaves back to DC. The device is known as
Rectenna which includes an antenna coupled with a rectifying circuit.

8.  Can get rid of cables
 Safe to use
 Ease of Use
 No plugging needed
 Low Transmission Losses
 Efficient
Advantages:

9.  Interference –EMI, EMS.
 Capital cost for practical
implementation is very high
 Security Issues
 Rectenna Size
Disadvantages:

10. References:
 https://www.quora.com/What-are-the-disadvantages-of-wireless-power-transmission
 [Wireless Power Transfer for Electric Vehicles and Mobile Devices] Chun T. Rim Gwangju
Institute of Science and Technology, South Korea Chris Mi San Diego State University,
California, USA
 [A Review on Wireless Power Transfer] International Journal of Engineering Trends and
Technology (IJETT)] – Volume-40 Number-5 - October 2016 Mohamed M. El Rayes 1 ,
Gihan Nagib 2 , Wahied G. Ali Abdelaal 3 1 Teaching Assistance, Electrical Engineering
Department, Fayoum University, Egypt 2Associate Professor, Electrical Engineering
Department, Fayoum University, Egypt 3Professor, Computer & Systems Engineering
Department, Ain Shams University, Egypt.
 [Cut the Cord: Wireless Power Transfer, its Applications, and its limits]
Rajeev Mehrotra, ramehrotra (at) go.wustl.edu (A paper written under the guidance of Prof.
Raj Jain.

11. Thank You