A radiation component of a miniature antenna comprises an access part for transmitting signals, two first radiating structures mirrored upon a mirror line with each other and spacing at intervals, and a second radiating structure connected with the first structures. Every first radiating structure has a first circuit and a second circuit spacing at intervals and along a straight line substantially parallel to the mirror line, and a third circuit connecting the first circuit and the second circuit. The second radiating structure has two first circuits intersected with the extending lines of the first circuits in the first radiating structure, and a second circuit connecting the first circuits. The access part is electrically connected to an end of the first circuit in the first radiating structure which is far away from the mirror line.