Wireless device

A wireless device, comprising:

• a first coil, comprising:
• a first metal wire, disposed in a first plane and having a first spiral structure;
• a second metal wire, disposed on a second plane and having a second spiral structure, wherein the second metal wire is electrically connected to the first metal wire, wherein the first metal wire and the second metal wire are continuously extended;
• a plurality of dummy metal wires disposed on the first plane and adjacent to a first terminal contact and a second terminal contact, wherein the dummy metal wires are electrically independent from each other;
• and
• a metal block disposed in the first plane, and the dummy metal wires surround the metal block and are electrically independent from the metal block.

A wireless device, comprising:

• a first coil, comprising:
• a first metal wire, disposed in a first plane and having a first spiral structure;
• and
• a second metal wire, disposed on a second plane and having a second spiral structure,
• wherein the second metal wire is electrically connected to the first metal wire,
• wherein the first metal wire and the second metal wire are continuously extended,
• wherein a width of an innermost turn of the first spiral structure is narrower than a width of an outermost turn of the first spiral structure, and
• wherein the first spiral structure has an intermediate turn disposed between the innermost turn and the outermost turn, wherein a first slit is formed on the intermediate turn, and the first slit divides the intermediate turn into a left portion and a right portion, and a width of the left portion or the right portion is smaller than the width of the innermost turn of the first spiral structure.