inductive resonance wireless power

hi everyone, i hav a project which involve using inductive resonance to produce wireless energy and then create a cell phone charger using that.

the problem now i faced is i have difficulties getting the power transfer efficiently.
wat i have done is, i come out wif the primary coil and a secondary coil both connected to a capacitor parallely.Can anyone tell me any equation to get the coil to transmit power in a maximum rate.

i have been designing the coil using the formula 2(pi)f=1/√LC to find the resonance frequency,but when i test my circuit it seems that all frequency gives the same output AC voltage which is arround 250mV peak to peak(My primary coil input is a 10V AC ,calculated the resonance frequency is 90kHz)

any suggestion or recommendations?

thanks alot.

This method is always inefficient unless the spacing between the coils is small compared to their diameter. Pancake wound coils work best. Attached is a paper on the subject.

hi

im also doing this project on wireless resonant inductive coupling.im trying to learn how to simulate now but i could find the appropriate tutorials on hfss on square coil antenna.could you share wif me about ur simulation?

rgds
Alex