Wireless power transfer coupling structures with reduced leakage flux

A wireless coupling apparatus comprising:

• a first layer comprising a flux coupling coil having two opposing end regions separated by two opposing side regions;
• a second layer comprising a first block of highly magnetically permeable material and a second block of highly magnetically permeable material;
• and
• a third layer comprising a leakage flux control coil, wherein
• the first block is provided proximate to one of the end regions and the second block is provided proximate to the other of the end regions.

A Wireless coupling apparatus comprising:

• a first layer comprising two flux coupling coils, both flux coupling coils having two opposing end regions separated by two opposing side regions, respective flux coupling coils being located adjacent to each other with an end region of one coil being adjacent to an end region of the other coil;
• a second layer comprising one or more blocks of highly magnetically permeable material;
• and
• a third layer comprising two leakage flux control coils, wherein
• respective block(s) are provided proximate to end regions of the flux coupling coils which are adjacent to each other.

A wireless coupling apparatus comprising:

• a first layer comprising a flux coupling coil;
• a second layer comprising a highly magnetically permeable material;
• and
• a third layer comprising a leakage flux control coil, wherein
• at least part of the periphery of the leakage flux control coil extends beyond a part of the periphery of the magnetically permeable material.