Patent ID: 8655272

Claim:
An apparatus, comprising: a power source circuit in a wireless charging device configured to produce a source alternating current in a frequency range less than radio frequency; a radio frequency blocking filter coupled to the power source, configured to limit radio frequency noise; a transmitting coil coupled to the blocking filter, configured to inductively couple with a proximately located receiving coil in a radio frequency communication device, using contact-less electromagnetic induction, to wirelessly provide power with reduced radio frequency noise; a first RF inductor in the filter, coupled between said power source and a first terminal of said transmitting coil, having a high impedance to frequencies in a carrier frequency range of the radio frequency communication device, to limit transferring the radio frequency noise; a first capacitance in the filter, coupled between said power source and ground potential, configured as an RF bypass for the carrier frequency range of the communication device, to bypass to ground the radio frequency noise; a second RF inductor in the filter, coupled between said power source and a second terminal of said transmitting coil, having a high impedance to frequencies in the carrier frequency range of the radio frequency communication device, to limit transferring the radio frequency noise; and a second capacitance in the filter, coupled between said power source and ground potential, configured as an RF bypass for the carrier frequency range of the communication device, to bypass to ground the radio frequency noise.