Antenna for wireless power transmission

An antenna for wireless power transmission comprising:

• a first coil portion comprising a first outer coil portion and a first inner coil portion;
• and
• a second coil portion comprising a second outer coil portion and a second inner coil portion, wherein the first coil portion and the second coil portion overlap and intersect each other at one or more points, wherein
• each of the first outer coil portion and the second outer coil portion comprises a plurality of bends,
• each of the first inner coil portion and the second inner coil portion comprises one inner bend,
• the plurality of bends of the first outer coil portion and the plurality of bends of the second outer coil portion overlap and intersect each other, and the one inner bend of the first inner coil portion and the one inner bend of the second inner coil portion overlap and intersect each other,
• the first coil portion is located above the second coil portion at an intersection of the first coil portion and the second coil portion, or the second coil portion is located above the first coil portion at the intersection of the first coil portion and the second coil portion,
• each of the first outer coil portion and the second outer coil portion has a spiral structure comprised of concentric double rectangles having different sizes,
• vertices of the concentric double rectangles of the spiral structure are curved, and
• the first outer coil portion and the second outer coil portion consist of four (4) concentric rectangles.