Coplanar inductor

A coplanar inductor, comprising:

• a conductive patch;
• a first spiral arm having a first end connected to the conductive patch and a second end, wherein the first spiral arm spirally extends from the first end of the first spiral arm toward the second end of the first spiral arm from the inside to the outside;
• and
• a second spiral arm having a first end connected to the conductive patch and a second end, wherein the second spiral arm extends spirally from the first end of the second spiral arm toward the second end of the second spiral arm from the inside to the outside,
• wherein the first spiral arm, the conductive patch, and the second spiral arm are coplanar, and the coplanar inductor is physically connected to at least one external circuit only via the second end of the first spiral arm and the second end of the second spiral arm, wherein the conductive patch is a round patch, a radius of the conductive patch is equal to a line width of each of the first spiral arm and the second spiral arm, wherein the round patch only connects with the first spiral arm and the second spiral arm.