A wireless power and data transmission apparatus comprising: a power input unit (110; 210); one or more capacitors (C 1,1,..,C 1,n); an inductor (L 1); one or more switches (121, 123, 125, 127) corresponding to the one or more capacitors; characterized in that the one or more capacitors are configured for electrically connecting the one or more capacitors either to the inductor or to the power input unit, wherein the inductor and the one or more capacitors, once connected thereto, form a source resonator; the apparatus further comprising: a modulator configured to modulate first data by adjusting a power amount to be charged in said one or more capacitors, wherein the modulator is preferably configured to modulate the first data by quantizing the power amount into N levels, and wherein the one or more capacitors are preferably arranged in a parallel manner; a switch controller (120; 240) configured to control said one or more switches corresponding to the one or more capacitors based on a charging time, during which time the one or more capacitors are connected to the power input unit, to charge the one or more capacitors, and a transfer time, during which time the one or more capacitors are connected to the inductor, to transfer a power charged in the one or more capacitors and the modulated first data to the source resonator; and a transmitter configured to transmit the charged power and the modulated first data using the source resonator. a power input unit (110; 210); one or more capacitors (C 1,1,..,C 1,n); an inductor (L 1); one or more switches (121, 123, 125, 127) corresponding to the one or more capacitors; characterized in that the one or more capacitors are configured for electrically connecting the one or more capacitors either to the inductor or to the power input unit, wherein the inductor and the one or more capacitors, once connected thereto, form a source resonator; the apparatus further comprising: a modulator configured to modulate first data by adjusting a power amount to be charged in said one or more capacitors, wherein the modulator is preferably configured to modulate the first data by quantizing the power amount into N levels, and wherein the one or more capacitors are preferably arranged in a parallel manner; a switch controller (120; 240) configured to control said one or more switches corresponding to the one or more capacitors based on a charging time, during which time the one or more capacitors are connected to the power input unit, to charge the one or more capacitors, and a transfer time, during which time the one or more capacitors are connected to the inductor, to transfer a power charged in the one or more capacitors and the modulated first data to the source resonator; and a transmitter configured to transmit the charged power and the modulated first data using the source resonator. a modulator configured to modulate first data by adjusting a power amount to be charged in said one or more capacitors, wherein the modulator is preferably configured to modulate the first data by quantizing the power amount into N levels, and wherein the one or more capacitors are preferably arranged in a parallel manner; a switch controller (120; 240) configured to control said one or more switches corresponding to the one or more capacitors based on a charging time, during which time the one or more capacitors are connected to the power input unit, to charge the one or more capacitors, and a transfer time, during which time the one or more capacitors are connected to the inductor, to transfer a power charged in the one or more capacitors and the modulated first data to the source resonator; and a transmitter configured to transmit the charged power and the modulated first data using the source resonator.