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hi Im Sabine Yaakov this presentation is entitled wireless power transfer circuit theory limitations of the classical design now a wireless power transfer system consists of two antennas one of the transmitter connected to the driver here and then there is the receiving antenna connected to receiver which has a rectifier some other electronics in it in it in order to extract the power from the antenna now the transfer of energy from the transmitter to the receiver is based on a inductive or magnetic transfer and that is that the transmitter is generating a magnetic flux which is then penetrating through the receiving antenna and in therefore generating a voltage here which actually transferred the power to the receiver now unfortunately part of this flux is actually not common to the tool and its sort of closed here around the transmitter so therefore not all the flux is actually moved to the receiver and in order to quantify it we have this coupling coefficient term such that K time