A wireless power transfer system operating by resonant near-field inductive coupling can be modeled as a two-port network. The efficiency of a wireless power transfer
system when modeled as a two-port network with impedance
parameters is given by the following formula abs(Z12)^2/RLabs(Z11).
take a look at the attached paper to drill down.
best regards
Adding to the answer of Andrea,
You can reduce your transfer system at the output by Thevenin to a driving electromotive force which is the open circuit voltage at the output terminal in series with an equivalent source resistance Rs.
Then the the output power will be equal to[ Vs/(RL + RS)]^2 RL= I^2 RL.
wish you success
You can calculate the efficiency by measuring the S21 parameters. The peak of S21 at the designed wavelength can give you the estimate of power transfer efficiency. For example, the peak at 3dB will indicate 50% power transfer is achieved.
I have attached a recent paper of mine published in "2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)". That can give you some insight on estimating power transfer efficiency.
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