U can use sm

all solenoid which can work as tesla coil....!!!

Two coils placed at some distance according to voltage rating...

So, I use a coil as the output of my circuit? And another coil for receiver ? Is there any web/ ebook I can read? Thank you

i didn't find any journal but u can find the brief from this wiki link....

http://en.wikipedia.org/wiki/Tesla_coil

http://books.google.co.in/books?id=o39HRjMqTuwC&pg=PT27&dq=%22tesla+coil%22+spark+transmitter&redir_esc=y#v=onepage&q=%22tesla%20coil%22%20spark%20transmitter&f=false

 A group from MIT, led by Prof. Marin Soljacic has succeeded in transferring electric energy (60 Watt, 50Hz)  between two coils more than two meters apart through non-radiative electromagnetic field. Of course the efficiency is inversely proportional to the distance and the major concern is the influence on human health. The work was reported in the June issue of science express , the advance online journal of the journal  science. 

 Today, using advance technology, converting energy into laser beams to transfer over reasonable distances is becoming closer to practice.

Ref. 

F. Hadley, MIT Demos Wireless Power Transmission, MIT Tech Talk, 13 Jun 07.  

@Basil Saied

Thanks for the reference, interesting. Regarding your comment about the use of laser beams, I agree that it is more reasonable in some circumstances. However, it is interesting to extract energy from a electromagnetic field some others. An example from one of my last projects. We have developed a very specific technology for efficient multi-hop communications along high-voltage power lines. The systems are powered with solar pannels. It was funny, although high-voltage power lines have a lot of electrical energy, we have to produce our own enegy for powering the nodes. Theoretically it can be done with a coil but there are a lot of practical concerns around the security, the consequences on the efficiency of the lines, etc. I just mention this as an example that illustrates why it is worth to advance in this line of research.

Mr.Fazar,

I see that the question" how to transfer Electricity wireless and your requirement of 20V,4.7A converter do not go together. Do you want power to be supplied without wires to that converter?

Otherwise your requirement can be met with a simple Battery Charger Circuit using either a Bridge Rectifier or full wave rectifier with center tapped Transformer and capacitive filter If you want Variable output voltage you can go for Full wave converter using Thyristors or Fixed output Voltage connected to a potential divider circuit

As far as wireless transfer of electricity is concerned a lot of answers are given above and you can also refer to the answer given by me to Dr.I.Munuswamy's question on calculation of coefficient of coupling between two coils separated 20 m apart.

It should be kept in our mind that in our Zeal to go for sophisticated high end

Technology we should not not ignore simple and economic solutions which are time tested.

After all it is Economics that governs the world.

The Engineers' attitude should be to give Technically Feasible and Economically viable Gadgets of simpler Design.

I appreciate the intention to generate lively discussion.

Dr.P.S.

thank you for your answer DR. P.S , i really appreciated it.

i read for some reference that, it will be just use full bridge rectifier like you said DR. P.S, but the problem is, how to transfer the voltage and the current? is it possible? is there any losses?

and how the receiver works? because it needs just LC circuit (based on the reference that i read before)

what is your opinion? please do you mind to give me some another reference that based on how the wireless power transfer actually happen?

please answer in this question :

https://www.researchgate.net/post/How_to_transfer_voltage_and_current_wirelessly_Is_it_possible_Or_just_the_frequency_that_will_be_transfered

thank you for your answer, i really appreciated it.

Dear Ryad , You can see this link:

http://www.witricity.com/

@Mehdi

Next time please just copy the URL into your answer instead of doing copy & paste.

http://electronics.howstuffworks.com/everyday-tech/wireless-power.htm