An antenna includes a grounding portion extending in a longitudinal direction, a radiating portion extending in the longitudinal direction and parallel with the grounding portion, a connecting portion connecting the grounding portion and the radiating portion in a transverse direction perpendicular to the longitudinal direction and a coaxial cable. The coaxial cable comprises an inner conductor and an outer conductor surrounding the inner conductor, wherein the inner conductor comprises a first feed point connecting the connecting portion and a second feed point connecting the radiating portion, one part of the connecting portion is shortened serving as a shortened section between the first and second feed points.