I have single turn magnetic loop and I want to make matched network for transferring power. The design need a impedance transformer to sending power. I am really pleased if users help me to design this transformer? for example if I find that ratio is 40/5 how can I determine those Toroidal Transformers primary turn? How can I find out my class AB power amplifier output impedance which should be matched to the transformer+magnetic loop? It is also noted that the frequency is 100KHz.