Apparatus and method for wireless power transmission including a source resonator having a substantially uniform megnetic field

A wireless power transmitter comprising:

• a source resonator for wirelessly transmitting power to a target device;
• and
• at least one sub-resonator,
• positioned inside of the source resonator,
• wherein the at least one sub-resonator comprises:
• a first transmission line comprising a first signal conducting portion, a second signal conducting portion, and a first ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;
• a first conductor electrically connecting the first signal conducting portion and the first ground conducting portion;
• a second conductor electrically connecting the second signal conducting portion and the first ground conducting portion;
• and
• a first capacitor inserted between the first signal conducting portion and the second signal conducting portion, in series with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.