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how to design wireless power transmitter?
i need to design a wireless power transmitter and receiver, so that atleast 3 watt (at 5 volt) power is received at receiver section. transmitter and receiver can be at maximum distance of 2 to 4 meters. the transmitting and receiving antenna cant be more than 1 meter. My idea is to generate a high frequency wave, and amplify it using mosfets connected in cascode *connection. then improve the power by *darlington power transistors and transmit it using an antenna . rectify it in receiver by using schotky diodes.
please help me to choose — 1. appropriate operating frequency (please dont suggest microwave) 2. appropriate mosfets, and darlington transistors 3. appropriate antenna design (may be directive or non directive) 4. passive filter in receiver end
can i increase the power strength of signal, simply by using high power amplifiers? and coupling it to antenna by using transformer?
i know that radiated power is proportional to square of antenna current, which is again a function of radiation resistance. entire things goes more and more complicated in this way.please help me to design such a transmitter( efficiency ca be anything).