Stacked resonant structures for wireless power systems

A wireless power receiving device configured to receive wireless power signals transmitted by a wireless power transmitter, the wireless power receiving device comprising:

• stacked resonant structures configured to receive the wireless power signals, wherein the stacked resonant structures comprise:
• a magnetic core having a central post,
• stacked dielectric layers within the magnetic core and laterally surrounding the central post and including a dielectric drive layer, and
• conductive layers interleaved with the stacked dielectric layers, wherein the conductive layers comprise openings about the central post and wherein adjacent pairs of the conductive layers contribute series capacitances to the stacked resonant structures;
• a substrate external to the magnetic core;
• drive traces on the substrate, wherein the magnetic core has first and second openings, the dielectric drive layer having a first leg protruding through the first opening and a second leg protruding through the second opening;
• a first contact pad on the first leg and soldered to the drive traces;
• a second contact pad on the second leg and soldered to the drive traces;
• and
• rectifier circuitry coupled to the drive traces, wherein the rectifier circuitry is configured to produce direct-current power from the wireless power signals received by the stacked resonant structures.