You have not provided enough information for anyone to answer your question. Based on what you have said the guy you would want to talk to is Nikola Tesla.
You want wireless power transmission? Google the circuit(s) used for charging an electric toothbrush. That is as good as it gets with the information you provided.
There is not really a plain circuit for wireless power transmission--that is exactly what Nikola Tesla was working on before he lost his funding. Look up the Wardenclyffe project, and google "Tesla's wireless power transmission." You'll get all kinds of information there. You must understand, however, that these usually use Tesla coils, which are rather difficult to build and are not for beginners.
Der Strom
You want a "powermat"? Then read a little on them and build one. Start with my suggestion of looking for a charging circuit for an electric toothbrush and multiply the thing.