Abstract: A method of manufacturing mini air coils is revealed. Use a non-magnetic conductive line with toughness as a carrier. Wind a wire around the carrier and set the wound wire into a pattern. Then cut the wire and the carrier respectively. Thereby a mini air coil with diameter less than 0.5 mm is manufactured.

Abstract: A coil includes a coil individual, and a shell part; the coil individual includes a helical coil, which is made by winding a tiny metallic wire, and includes a helical body, and two end wire portions; the coil individual further includes a flexible print circuit, which has electricity-conducting layers on two sides of a middle thereof; the helical coil is positioned on the flexible print circuit, with the two end wire portions thereof and the electricity-conducting layers being joined together to form the frames of the coil individual; the coil individual is wrapped in the shell part with the frames thereof sticking out from the shell part; the frames are bent so as to be closely in touch with an outer side of the shell part.